INTERNET-DRAFT MCNS Cable Device MIB October 1998 Cable Device Management Information Base for MCNS compliant Cable Modems and Cable Modem Termination Systems draft-ietf-ipcdn-cable-device-mib-06.txt Tue Oct 20 15:41:51 PDT 1998 Guenter Roeck (editor) cisco Systems groeck@cisco.com Status of this Memo This document is an Internet-Draft. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its Areas, and its Working Groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as a "work in progress". To view the entire list of current Internet-Drafts, please check the "1id-abstracts.txt" listing contained in the Internet-Drafts Shadow Directories on ftp.is.co.za (Africa), ftp.nordu.net (Europe), munnari.oz.au (Pacific Rim), ftp.ietf.org (US East Coast), or ftp.isi.edu (US West Coast). Copyright (c) The Internet Society 1998. All Rights Reserved. Abstract This memo defines an experimental portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it defines a basic set of managed objects for SNMP-based management of MCNS compliant Cable Modems and Cable Modem Termination Systems. This memo specifies a MIB module in a manner that is compliant to the SNMP SMIv2[5][6][7]. The set of objects is consistent with the SNMP framework and existing SNMP standards. This memo is a product of the IPCDN working group within the Internet Engineering Task Force. Comments are solicited and should be addressed to the working group's mailing list at ipcdn@terayon.com and/or the author. Expires April 1999 [Page 1] INTERNET-DRAFT MCNS Cable Device MIB October 1998 Table of Contents 1 The SNMP Management Framework ................................... 3 2 Glossary ........................................................ 4 2.1 CATV .......................................................... 4 2.2 CM ............................................................ 4 2.3 CMTS .......................................................... 4 2.4 DOCSIS ........................................................ 4 2.5 Downstream .................................................... 4 2.6 Head-end ...................................................... 4 2.7 MAC Packet .................................................... 4 2.8 MCNS .......................................................... 4 2.9 RF ............................................................ 4 2.10 Upstream ..................................................... 4 3 Overview ........................................................ 5 3.1 Structure of the MIB .......................................... 5 3.2 Management requirements ....................................... 6 3.2.1 Handling of Software upgrades ............................... 6 3.2.2 Events and Traps ............................................ 6 3.2.3 Trap Throttling ............................................. 7 3.2.3.1 Trap rate throttling ...................................... 7 3.2.3.2 Limiting the trap rate .................................... 8 3.3 Protocol Filters .............................................. 8 4 Definitions ..................................................... 9 5 Acknowledgments ................................................. 42 6 References ...................................................... 42 7 Security Considerations ......................................... 44 8 Intellectual Property ........................................... 44 9 Copyright Section ............................................... 44 10 Author's Address ............................................... 45 Expires April 1999 [Page 2] INTERNET-DRAFT MCNS Cable Device MIB October 1998 1. The SNMP Management Framework The SNMP Management Framework presently consists of five major components: o An overall architecture, described in RFC 2271 [1]. o Mechanisms for describing and naming objects and events for the purpose of management. The first version of this Structure of Management Information (SMI) is called SMIv1 and described in RFC 1155 [2], RFC 1212 [3] and RFC 1215 [4]. The second version, called SMIv2, is described in RFC 1902 [5], RFC 1903 [6] and RFC 1904 [7]. o Message protocols for transferring management information. The first version of the SNMP message protocol is called SNMPv1 and described in RFC 1157 [8]. A second version of the SNMP message protocol, which is not an Internet standards track protocol, is called SNMPv2c and described in RFC 1901 [9] and RFC 1906 [10]. The third version of the message protocol is called SNMPv3 and described in RFC 1906 [10], RFC 2272 [11] and RFC 2274 [12]. o Protocol operations for accessing management information. The first set of protocol operations and associated PDU formats is described in RFC 1157 [8]. A second set of protocol operations and associated PDU formats is described in RFC 1905 [13]. o A set of fundamental applications described in RFC 2273 [14] and the view-based access control mechanism described in RFC 2275 [15]. Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the mechanisms defined in the SMI. This memo specifies a MIB module that is compliant to the SMIv2. A MIB conforming to the SMIv1 can be produced through the appropriate translations. The resulting translated MIB must be semantically equivalent, except where objects or events are omitted because no translation is possible (use of Counter64). Some machine readable information in SMIv2 will be converted into textual descriptions in SMIv1 during the translation process. However, this loss of machine readable information is not considered to change the semantics of the MIB. Expires April 1999 [Page 3] INTERNET-DRAFT MCNS Cable Device MIB October 1998 2. Glossary The terms in this document are derived either from normal cable system usage, or from the documents associated with the Data Over Cable Service Interface Specification process. 2.1. CATV Originally "Community Antenna Television", now used to refer to any cable or hybrid fiber and cable system used to deliver video signals to a community. 2.2. CM Cable Modem. A CM acts as a "slave" station in a DOCSIS compliant cable data system. 2.3. CMTS Cable Modem Termination System. A generic term covering a cable bridge or cable router in a head-end. A CMTS acts as the master station in a DOCSIS compliant cable data system. It is the only station that transmits downstream, and it controls the scheduling of upstream transmissions by its associated CMs. 2.4. DOCSIS "Data Over Cable Interface Specification". A term referring to the ITU-T J.112 Annex B standard for cable modem systems. [20] 2.5. Downstream >From the head-end towards the subscriber. 2.6. Head-end The origination point in most cable systems of the subscriber video signals. Generally also the location of the CMTS equipment. 2.7. MAC Packet A DOCSIS PDU. 2.8. MCNS "Multimedia Cable Network System". Generally replaced in usage by DOCSIS. 2.9. RF Radio Frequency. 2.10. Upstream >From the subscriber towards the head-end. Expires April 1999 [Page 4] INTERNET-DRAFT MCNS Cable Device MIB October 1998 3. Overview This MIB provides a set of objects required for the management of MCNS compliant Cable Modems (CM) and Cable Modem Termination Systems (CMTS). The specification is derived from the MCNS Radio Frequency Interface specification [16]. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [19]. 3.1. Structure of the MIB This MIB is structured into seven groups: o The docsDevBase group extends the MIB-II 'system' group with objects needed for cable device system management. o The docsDevNmAccessGroup provides a minimum level of SNMP access security (see Section 3 of [18]). o The docsDevSoftware group provides information for network- downloadable software upgrades. See "Handling of Software Upgrades" below.. o The docsDevServer group provides information about the progress of the interaction between the CM or CMTS and various provisioning servers. o The docsDevEvent group provides control and logging for event reporting. o The docsDevFilter group configures filters at link layer and IP layer for bridged data traffic. This group consists of a link- layer filter table, docsDevFilterLLCTable, which is used to manage the processing and forwarding of non-IP traffic; an IP packet classifier table, docsDevFilterIpTable, which is used to map classes of packets to specific policy actions; a policy table, docsDevFilterPolicyTable, which maps zero or more policy actions onto a specific packet classification, and one or more policy action tables. At this time, this MIB specifies only one policy action table, docsDevFilterTosTable, which allows the manipulation of the type of services bits in an IP packet based on matching some criteria. The working group may add additional policy types and action tables in the future, for example to allow QOS to modem service identifier assignment based on destination. o The docsDevCpe group provides control over which IP addresses may be used by customer premises equipment (e.g. PCs) serviced by a given cable modem. This provides anti-spoofing control at the Expires April 1999 [Page 5] INTERNET-DRAFT MCNS Cable Device MIB October 1998 point of origin for a large cable modem system. This group is seperate from docsDevFilter primarily this group is only implemented on the Cable Modem (CM) and MUST NOT be implemented on the Cable Modem Termination System (CMTS) 3.2. Management requirements 3.2.1. Handling of Software upgrades The Cable Modem software upgrade process is documented in [16]. From a network management station, the operator: o sets docsDevSwServer to the address of the TFTP server for software upgrades o sets docsDevSwFilename to the file pathname of the software upgrade image o sets docsDevSwAdminStatus to upgrade-from-mgt One reason for the SNMP-initiated upgrade is to allow loading of a temporary software image (e.g., special diagnostic software) that differs from the software normally used on that device without changing the provisioning database. Note that software upgrades should not be accepted blindly by the cable device. The cable device may refuse an upgrade if: o The download is incomplete. o The file contents are incomplete or damaged. o The software is not intended for that hardware device (may include the case of a feature set that has not been purchased for this device). 3.2.2. Events and Traps This MIB provides control facilities for reporting events through syslog, traps, and nonvolatile logging. If events are reported through traps, the specified conventions must be followed. Other means of event reporting are outside the scope of this document. The definition and coding of events is vendor-specific. In deference to the network operator who must troubleshoot multi-vendor networks, the circumstances and meaning of each event should be reported as human- readable text. Vendors SHOULD provide time-of-day clocks in CMs to provide useful timestamping of events. For each vendor-specific event that is reportable via TRAP, the vendor must create an enterprise-specific trap definition. Trap definitions MUST include the event reason encoded as DisplayString and should be Expires April 1999 [Page 6] INTERNET-DRAFT MCNS Cable Device MIB October 1998 defined as: trapName NOTIFICATION-TYPE OBJECTS { ifIndex, eventReason, other useful objects } STATUS current DESCRIPTION "trap description" ::= Object Id Note that ifIndex is only included if the event or trap is interface related. The last digit of the trap OID for enterprise-specific traps must match docsDevEvId. For SNMPv1-capable Network Management systems, this is necessary to correlate the event type to the trap type. Many Network Management systems are only capable of trap filtering on an enterprise and single-last-digit basis. 3.2.3. Trap Throttling The CM and CMTS MUST provide support for trap message throttling as described below. The network operator can employ message rate throttling or trap limiting by manipulating the appropriate MIB variables. 3.2.3.1. Trap rate throttling Network operators may employ either of two rate control methods. In the first method, the device ceases to send traps when the rate exceeds the specified maximum message rate. It resumes sending traps only if reactivated by a network management station request. In the second method, the device resumes sending traps when the rate falls below the specified maximum message rate. The network operator configures the specified maximum message rate by setting the measurement interval (in seconds), and the maximum number of traps to be transmitted within the measurement interval. The operator can query the operational throttling state (to determine whether traps are enabled or blocked by throttling) of the device, as well as query and set the administrative throttling state (to manage the rate control method) of the device. Expires April 1999 [Page 7] INTERNET-DRAFT MCNS Cable Device MIB October 1998 3.2.3.2. Limiting the trap rate Network operators may wish to limit the number of traps sent by a device over a specified time period. The device ceases to send traps when the number of traps exceeds the specified threshold. It resumes sending traps only when the measurement interval has passed. The network operator defines the maximum number of traps he is willing to handle and sets the measurement interval to a large number (in hundredths of a second). For this case, the administrative throttling state is set to stop at threshold which is the maximum number of traps. See "Techniques for Managing Asynchronously Generated Alerts" [17] for further information. 3.3. Protocol Filters The Cable Device MIB provides objects for both LLC and IP protocol filters. The LLC protocol filter entries can be used to limit CM forwarding to a restricted set of network-layer protocols (such as IP, IPX, NetBIOS, and Appletalk). The IP protocol filter entries can be used to restrict upstream or downstream traffic based on source and destination IP addresses, transport-layer protocols (such as TCP, UDP, and ICMP), and source and destination TCP/UDP port numbers. Expires April 1999 [Page 8] INTERNET-DRAFT MCNS Cable Device MIB October 1998 4. Definitions DOCS-CABLE-DEVICE-MIB DEFINITIONS ::= BEGIN IMPORTS MODULE-IDENTITY, OBJECT-TYPE, BITS, IpAddress, Unsigned32, Counter32, Integer32, experimental FROM SNMPv2-SMI DisplayString, RowStatus, DateAndTime, TruthValue FROM SNMPv2-TC OBJECT-GROUP, MODULE-COMPLIANCE FROM SNMPv2-CONF InterfaceIndexOrZero FROM IF-MIB; -- RFC2233 docsDev MODULE-IDENTITY LAST-UPDATED "9810201554Z" -- Oct 20, 1998 ORGANIZATION "IETF IPCDN Working Group" CONTACT-INFO " Guenter Roeck Postal: cisco Systems 170 West Tasman Drive San Jose, CA 95134 U.S.A. Phone: +1 408 527 3143 E-mail: groeck@cisco.com" DESCRIPTION "This is the MIB Module for MCNS-compliant cable modems and cable-modem termination systems." REVISION "9810131935Z" DESCRIPTION "Modified by Mike StJohns to add/revise filtering, TOS support, software version information objects." ::= { experimental 83 } docsDevMIBObjects OBJECT IDENTIFIER ::= { docsDev 1 } docsDevBase OBJECT IDENTIFIER ::= { docsDevMIBObjects 1 } -- -- For the following object, there is no concept in the -- RFI specification corresponding to a backup CMTS. The Expires April 1999 [Page 9] INTERNET-DRAFT MCNS Cable Device MIB October 1998 -- enumeration is provided here in case someone is able -- to define such a role or device. -- docsDevRole OBJECT-TYPE SYNTAX INTEGER { cm(1), cmtsActive(2), cmtsBackup(3) } MAX-ACCESS read-only STATUS current DESCRIPTION "Defines the current role of this device. cm (1) is a Cable Modem, cmtsActive(2) is a Cable Modem Termination System which is controlling the system of cable modems, and cmtsBackup(3) is a CMTS which is currently connected, but not controlling the system (not currently used)." ::= { docsDevBase 1 } docsDevDateTime OBJECT-TYPE SYNTAX DateAndTime MAX-ACCESS read-write STATUS current DESCRIPTION "The date and time, with optional timezone information." ::= { docsDevBase 2 } docsDevResetNow OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-write STATUS current DESCRIPTION "Setting this object to true(1) causes the device to reset. Reading this object always returns false(2)." ::= { docsDevBase 3 } docsDevSerialNumber OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "The manufacturer's serial number for this device." ::= { docsDevBase 4 } docsDevSTPControl OBJECT-TYPE SYNTAX INTEGER { stEnabled(1), noStFilterBpdu(2), noStPassBpdu(3) } Expires April 1999 [Page 10] INTERNET-DRAFT MCNS Cable Device MIB October 1998 MAX-ACCESS read-write STATUS current DESCRIPTION "This object controls operation of the spanning tree protocol (as distinguished from transparent bridging). If set to stEnabled(1) then the spanning tree protocol is enabled, subject to bridging constraints. If noStFilterBpdu(2), then spanning tree is not active, and Bridge PDUs received are discarded. If noStPassBpdu(3) then spanning tree is not active and Bridge PDUs are transparently forwarded. Note that a device need not implement all of these options, but that noStFilterBpdu(2) is required." ::= { docsDevBase 5 } -- -- The following table provides one level of security for access -- to the device by network management stations. -- Note that access is also constrained by the -- community strings and any vendor-specific security. -- docsDevNmAccessTable OBJECT-TYPE SYNTAX SEQUENCE OF DocsDevNmAccessEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table controls access to SNMP objects by network management stations. If the table is empty, access to SNMP objects is unrestricted." ::= { docsDevMIBObjects 2 } docsDevNmAccessEntry OBJECT-TYPE SYNTAX DocsDevNmAccessEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry describing access to SNMP objects by a particular network management station. An entry in this table is not readable unless the management station has read-write permission (either implicit if the table is empty, or explicit through an entry in this table. Entries are ordered by docsDevNmAccessIndex. The first matching entry (e.g. matching IP address and community string) is used to derive access." INDEX { docsDevNmAccessIndex } ::= { docsDevNmAccessTable 1 } DocsDevNmAccessEntry ::= SEQUENCE { docsDevNmAccessIndex Integer32, docsDevNmAccessIp IpAddress, docsDevNmAccessIpMask IpAddress, Expires April 1999 [Page 11] INTERNET-DRAFT MCNS Cable Device MIB October 1998 docsDevNmAccessCommunity DisplayString, docsDevNmAccessControl INTEGER, docsDevNmAccessInterfaces OCTET STRING, docsDevNmAccessStatus RowStatus } docsDevNmAccessIndex OBJECT-TYPE SYNTAX Integer32 (1..2147483647) MAX-ACCESS not-accessible STATUS current DESCRIPTION "Index used to order the application of access entries." ::= { docsDevNmAccessEntry 1 } docsDevNmAccessIp OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-create STATUS current DESCRIPTION "The IP address (or subnet) of the network management station. The address 255.255.255.255 is defined to mean any NMS. If traps are enabled for this entry, then the value must be the address of a specific device." DEFVAL { 'ffffffff'h } ::= { docsDevNmAccessEntry 2 } docsDevNmAccessIpMask OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-create STATUS current DESCRIPTION "The IP subnet mask of the network management stations. If traps are enabled for this entry, then the value must be 255.255.255.255." DEFVAL { 'ffffffff'h } ::= { docsDevNmAccessEntry 3 } docsDevNmAccessCommunity OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-create STATUS current DESCRIPTION "The community string to be matched for access by this entry. If set to a zero length string then any community string will match. When read, this object SHOULD return a zero length string." DEFVAL { "public" } ::= { docsDevNmAccessEntry 4 } docsDevNmAccessControl OBJECT-TYPE SYNTAX INTEGER { Expires April 1999 [Page 12] INTERNET-DRAFT MCNS Cable Device MIB October 1998 none(1), read(2), readWrite(3), roWithTraps(4), rwWithTraps(5), trapsOnly(6) } MAX-ACCESS read-create STATUS current DESCRIPTION "Specifies the type of access allowed to this NMS. Setting this object to none(1) causes the table entry to be destroyed. Read(2) allows access by 'get' and 'get-next' PDUs. ReadWrite(3) allows access by 'set' as well. RoWithtraps(4), rwWithTraps(5), and trapsOnly(6) control distribution of Trap PDUs transmitted by this device." DEFVAL { read } ::= { docsDevNmAccessEntry 5 } -- The syntax of the following object was copied from RFC1493, -- dot1dStaticAllowedToGoTo. docsDevNmAccessInterfaces OBJECT-TYPE SYNTAX OCTET STRING MAX-ACCESS read-create STATUS current DESCRIPTION "Specifies the set of interfaces from which requests from this NMS will be accepted. Each octet within the value of this object specifies a set of eight interfaces, with the first octet specifying ports 1 through 8, the second octet specifying interfaces 9 through 16, etc. Within each octet, the most significant bit represents the lowest numbered interface, and the least significant bit represents the highest numbered interface. Thus, each interface is represented by a single bit within the value of this object. If that bit has a value of '1' then that interface is included in the set. Note that entries in this table apply only to link-layer interfaces (e.g., Ethernet and CATV MAC). Upstream and downstream channel interfaces must not be specified." -- DEFVAL is the bitmask corresponding to all interfaces ::= { docsDevNmAccessEntry 6 } docsDevNmAccessStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "Controls and reflects the status of rows in this Expires April 1999 [Page 13] INTERNET-DRAFT MCNS Cable Device MIB October 1998 table. Rows in this table may be created by either the create-and-go or create-and-wait paradigms. There is no restriction on changing values in a row of this table while the row is active." ::= { docsDevNmAccessEntry 7 } -- -- Procedures for using the following group are described in section -- 3.2.1 -- docsDevSoftware OBJECT IDENTIFIER ::= { docsDevMIBObjects 3 } docsDevSwServer OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-write STATUS current DESCRIPTION "The address of the TFTP server used for software upgrades. If the TFTP server is unknown, return 0.0.0.0." ::= { docsDevSoftware 1 } docsDevSwFilename OBJECT-TYPE SYNTAX DisplayString (SIZE (0..64)) MAX-ACCESS read-write STATUS current DESCRIPTION "The file name of the software image to be loaded into this device. Unless set via SNMP, this is the file name specified by the provisioning server that corresponds to the software version that is desired for this device. If unknown, the string '(unknown)' is returned." ::= { docsDevSoftware 2 } docsDevSwAdminStatus OBJECT-TYPE SYNTAX INTEGER { upgradeFromMgt(1), allowProvisioningUpgrade(2), ignoreProvisioningUpgrade(3) } MAX-ACCESS read-write STATUS current DESCRIPTION "If set to upgradeFromMgt(1), the device will initiate a TFTP software image download using docsDevSwFilename. After successfully receiving an image, the device will set its state to ignoreProvisioningUpgrade(3) and reboot. If the download process is interrupted by a reset or power failure, the device will load the previous image and, after re-initialization, continue to attempt loading the image specified in docsDevSwFilename. Expires April 1999 [Page 14] INTERNET-DRAFT MCNS Cable Device MIB October 1998 If set to allowProvisioningUpgrade(2), the device will use the software version information supplied by the provisioning server when next rebooting (this does not cause a reboot). When set to ignoreProvisioningUpgrade(3), the device will disregard software image upgrade information from the provisioning server. Note that reading this object can return upgradeFromMgt(1). This indicates that a software download is currently in progress, and that the device will reboot after successfully receiving an image. At initial startup, this object has the default value of allowProvisioningUpgrade(2)." ::= { docsDevSoftware 3 } docsDevSwOperStatus OBJECT-TYPE SYNTAX INTEGER { inProgress(1), completeFromProvisioning(2), completeFromMgt(3), failed(4), other(5) } MAX-ACCESS read-only STATUS current DESCRIPTION "InProgress(1) indicates that a TFTP download is underway, either as a result of a version mismatch at provisioning or as a result of a upgradeFromMgt request. CompleteFromProvisioning(2) indicates that the last software upgrade was a result of version mismatch at provisioning. CompleteFromMgt(3) indicates that the last software upgrade was a result of setting docsDevSwAdminStatus to upgradeFromMgt. Failed(4) indicates that the last attempted download failed, ordinarily due to TFTP timeout." REFERENCE "DOCSIS Radio Frequency Interface Specification, Section 8.2, Downloading Cable Modem Operating Software." ::= { docsDevSoftware 4 } docsDevSwCurrentVers OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "The software version currently operating in this device. This object should be in the syntax used by the individual vendor to identify software versions. Any CM MUST return a Expires April 1999 [Page 15] INTERNET-DRAFT MCNS Cable Device MIB October 1998 string descriptive of the current software load. For a CMTS, this object SHOULD contain either a human readable representation of the vendor specific designation of the software for the chassis, or of the software for the control processor. If neither of these is applicable, this MUST contain an empty string." ::= { docsDevSoftware 5 } -- -- The following group describes server access and parameters used for -- initial provisioning and bootstrapping. -- docsDevServer OBJECT IDENTIFIER ::= { docsDevMIBObjects 4 } docsDevServerBootState OBJECT-TYPE SYNTAX INTEGER { operational(1), disabled(2), waitingForDhcpOffer(3), waitingForDhcpResponse(4), waitingForTimeServer(5), waitingForTftp(6), refusedByCmts(7), forwardingDenied(8), other(9), unknown(10) } MAX-ACCESS read-only STATUS current DESCRIPTION "If operational(1), the device has completed loading and processing of configuration parameters and the CMTS has completed the Registration exchange. If disabled(2) then the device was administratively disabled, possibly by being refused network access in the configuration file. If waitingForDhcpOffer(3) then a DHCP Discover has been transmitted and no offer has yet been received. If waitingForDhcpResponse(4) then a DHCP Request has been transmitted and no response has yet been received. If waitingForTimeServer(5) then a Time Request has been transmitted and no response has yet been received. If waitingForTftp(6) then a request to the TFTP parameter server has been made and no response received. If refusedByCmts(7) then the Registration Request/Response exchange with the CMTS failed. If forwardingDenied(8) then the registration process completed, but the network access option in the received configuration file prohibits forwarding. " REFERENCE Expires April 1999 [Page 16] INTERNET-DRAFT MCNS Cable Device MIB October 1998 "DOCSIS Radio Frequency Interface Specification, Figure 7-1, CM Initialization Overview." ::= { docsDevServer 1 } docsDevServerDhcp OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The IP address of the DHCP server that assigned an IP address to this device. Returns 0.0.0.0 if DHCP was not used for IP address assignment." ::= { docsDevServer 2 } docsDevServerTime OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The IP address of the Time server (RFC-868). Returns 0.0.0.0 if the time server IP address is unknown." ::= { docsDevServer 3 } docsDevServerTftp OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The IP address of the TFTP server responsible for downloading provisioning and configuration parameters to this device. Returns 0.0.0.0 if the TFTP server address is unknown." ::= { docsDevServer 4 } docsDevServerConfigFile OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "The name of the device configuration file read from the TFTP server. Returns an empty string if the configuration file name is unknown." ::= { docsDevServer 5 } -- -- Event Reporting -- docsDevEvent OBJECT IDENTIFIER ::= { docsDevMIBObjects 5 } docsDevEvControl OBJECT-TYPE SYNTAX INTEGER { Expires April 1999 [Page 17] INTERNET-DRAFT MCNS Cable Device MIB October 1998 resetLog(1), useDefaultReporting(2) } MAX-ACCESS read-write STATUS current DESCRIPTION "Setting this object to resetLog(1) empties the event log. All data is deleted. Setting it to useDefaultReporting(2) returns all event priorities to their factory-default reporting. Reading this object always returns useDefaultReporting(2)." ::= { docsDevEvent 1 } docsDevEvSyslog OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-write STATUS current DESCRIPTION "The IP address of the Syslog server. If 0.0.0.0, syslog transmission is inhibited." ::= { docsDevEvent 2 } docsDevEvThrottleAdminStatus OBJECT-TYPE SYNTAX INTEGER { unconstrained(1), maintainBelowThreshold(2), stopAtThreshold(3), inhibited(4) } MAX-ACCESS read-write STATUS current DESCRIPTION "Controls the transmission of traps and syslog messages with respect to the trap pacing threshold. unconstrained(1) causes traps and syslog messages to be transmitted without regard to the threshold settings. maintainBelowThreshold(2) causes trap transmission and syslog messages to be suppressed if the number of traps would otherwise exceed the threshold. stopAtThreshold(3) causes trap transmission to cease at the threshold, and not resume until directed to do so. inhibited(4) causes all trap transmission and syslog messages to be suppressed. A single event is always treated as a single event for threshold counting. That is, an event causing both a trap and a syslog message is still treated as a single event. Writing to this object resets the thresholding state. At initial startup, this object has a default value of unconstrained(1)." Expires April 1999 [Page 18] INTERNET-DRAFT MCNS Cable Device MIB October 1998 ::= { docsDevEvent 3 } docsDevEvThrottleInhibited OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-only STATUS current DESCRIPTION "If true(1), trap and syslog transmission is currently inhibited due to thresholds and/or the current setting of docsDevEvThrottleAdminStatus." ::= { docsDevEvent 4 } docsDevEvThrottleThreshold OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-write STATUS current DESCRIPTION "Number of trap/syslog events per docsDevEvThrottleInterval to be transmitted before throttling. A single event is always treated as a single event for threshold counting. That is, an event causing both a trap and a syslog message is still treated as a single event. At initial startup, this object returns 0." ::= { docsDevEvent 5 } docsDevEvThrottleInterval OBJECT-TYPE SYNTAX Integer32 (1..2147483647) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "The interval over which the trap threshold applies. At initial startup, this object has a value of 1." ::= { docsDevEvent 6 } -- -- The following table controls the reporting of the various classes of -- events. For each event priority, -- a combination of logging and reporting mechanisms may be chosen. The -- mapping of event types -- to priorities is vendor-dependent. Vendors may also choose to allow -- the user to control that mapping -- through proprietary means. docsDevEvControlTable OBJECT-TYPE SYNTAX SEQUENCE OF DocsDevEvControlEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Allows control of the reporting of event classes." Expires April 1999 [Page 19] INTERNET-DRAFT MCNS Cable Device MIB October 1998 ::= { docsDevEvent 7 } docsDevEvControlEntry OBJECT-TYPE SYNTAX DocsDevEvControlEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Allows configuration of the reporting mechanisms for a particular event priority." INDEX { docsDevEvPriority } ::= { docsDevEvControlTable 1 } DocsDevEvControlEntry ::= SEQUENCE { docsDevEvPriority INTEGER, docsDevEvReporting BITS } docsDevEvPriority OBJECT-TYPE SYNTAX INTEGER { emergency(1), alert(2), critical(3), error(4), warning(5), notice(6), information(7), debug(8) } MAX-ACCESS not-accessible STATUS current DESCRIPTION "The priority level that is controlled by this entry. These are ordered from most (emergency) to least (debug) critical. Each event with a CM or CMTS has a particular priority level associated with it (as defined by the vendor). During normal operation no event more critical than notice(6) should be generated. Events between warning and emergency should be generated at appropriate levels of problems (e.g. emergency when the box is about to crash)." ::= { docsDevEvControlEntry 1 } docsDevEvReporting OBJECT-TYPE SYNTAX BITS { local(0), traps(1), syslog(2) } MAX-ACCESS read-write STATUS current DESCRIPTION Expires April 1999 [Page 20] INTERNET-DRAFT MCNS Cable Device MIB October 1998 "Defines the action to be taken on occurrence of this event class. Implementations may not necessarily support all options for all event classes, but at minimum must allow traps and syslogging to be disabled. If the local(0) bit is set, then log to the internal log, if the traps(1) bit is set, then generate a trap, if the syslog(2) bit is set, then send a syslog message (assuming the syslog address is set)." ::= { docsDevEvControlEntry 2 } docsDevEventTable OBJECT-TYPE SYNTAX SEQUENCE OF DocsDevEventEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Contains a log of network and device events that may be of interest in fault isolation and troubleshooting." ::= { docsDevEvent 8 } docsDevEventEntry OBJECT-TYPE SYNTAX DocsDevEventEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Describes a network or device event that may be of interest in fault isolation and troubleshooting. Multiple sequential identical events are represented by incrementing docsDevEvCounts and setting docsDevEvLastTime to the current time rather than creating multiple rows. Entries are created with the first occurrance of an event. docsDevEvControl can be used to clear the table. Individual events can not be deleted." INDEX { docsDevEvIndex } ::= { docsDevEventTable 1 } DocsDevEventEntry ::= SEQUENCE { docsDevEvIndex Integer32, docsDevEvFirstTime DateAndTime, docsDevEvLastTime DateAndTime, docsDevEvCounts Counter32, docsDevEvLevel INTEGER, docsDevEvId Unsigned32, docsDevEvText DisplayString } docsDevEvIndex OBJECT-TYPE SYNTAX Integer32 (1..2147483647) MAX-ACCESS not-accessible STATUS current DESCRIPTION "Provides relative ordering of the objects in the event Expires April 1999 [Page 21] INTERNET-DRAFT MCNS Cable Device MIB October 1998 log. This object will always increase except when (a) the log is reset via docsDevEvControl, (b) the device reboots and does not implement nonvolatile storage for this log, or (c) it reaches the value 2^31. The next entry for all the above cases is 1." ::= { docsDevEventEntry 1 } docsDevEvFirstTime OBJECT-TYPE SYNTAX DateAndTime MAX-ACCESS read-only STATUS current DESCRIPTION "The time that this entry was created." ::= { docsDevEventEntry 2 } docsDevEvLastTime OBJECT-TYPE SYNTAX DateAndTime MAX-ACCESS read-only STATUS current DESCRIPTION "If multiple events are reported via the same entry, the time that the last event for this entry occurred, otherwise this should have the same value as docsDevEvFirstTime. " ::= { docsDevEventEntry 3 } -- This object was renamed from docsDevEvCount to meet naming -- requirements for Counter32 docsDevEvCounts OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of consecutive event instances reported by this entry. This starts at 1 with the creation of this row and increments by 1 for each subsequent duplicate event." ::= { docsDevEventEntry 4 } docsDevEvLevel OBJECT-TYPE SYNTAX INTEGER { emergency(1), alert(2), critical(3), error(4), warning(5), notice(6), information(7), debug(8) } MAX-ACCESS read-only STATUS current DESCRIPTION Expires April 1999 [Page 22] INTERNET-DRAFT MCNS Cable Device MIB October 1998 "The priority level of this event as defined by the vendor. These are ordered from most serious (emergency) to least serious (debug)." ::= { docsDevEventEntry 5 } -- -- Vendors will provide their own enumerations for the following. -- The interpretation of the enumeration is unambiguous for a -- particular value of the vendor's enterprise number in sysObjectID. -- docsDevEvId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "For this product, uniquely identifies the type of event that is reported by this entry." ::= { docsDevEventEntry 6 } docsDevEvText OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "Provides a human-readable description of the event, including all relevant context (interface numbers, etc.)." ::= { docsDevEventEntry 7 } docsDevFilter OBJECT IDENTIFIER ::= { docsDevMIBObjects 6 } -- LLC (Link Level Control) filters can be defined on an inclusive or -- exclusive basis: CMs can be configured to forward only packets -- matching a set of layer three protocols, or to drop packets -- matching a set of layer three protocols. Typical use of these -- filters is to filter out possibly harmful (given the context of a -- large metropolitan LAN) protocols. docsDevFilterLLCDefault OBJECT-TYPE SYNTAX INTEGER { discard(1), accept(2) } MAX-ACCESS read-write STATUS current DESCRIPTION "If set to discard(1), all packets not matching an LLC filter will be discarded. If set to accept(2), all packets not matching an LLC filter will be accepted for further processing (e.g., bridging). At initial system startup, this object returns accept(2)." Expires April 1999 [Page 23] INTERNET-DRAFT MCNS Cable Device MIB October 1998 ::= { docsDevFilter 1 } docsDevFilterLLCTable OBJECT-TYPE SYNTAX SEQUENCE OF DocsDevFilterLLCEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A list of filters to apply to (bridged) LLC traffic, which forwards or drops packets on the basis of the layer two protocol type." ::= { docsDevFilter 2 } docsDevFilterLLCEntry OBJECT-TYPE SYNTAX DocsDevFilterLLCEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Describes a single filter to apply to (bridged) LLC traffic received on a specified interface. " INDEX { docsDevFilterLLCIndex } ::= { docsDevFilterLLCTable 1 } DocsDevFilterLLCEntry ::= SEQUENCE { docsDevFilterLLCIndex Integer32, docsDevFilterLLCStatus RowStatus, docsDevFilterLLCIfIndex InterfaceIndexOrZero, docsDevFilterLLCProtocolType INTEGER, docsDevFilterLLCProtocol Integer32, docsDevFilterLLCMatches Counter32 } docsDevFilterLLCIndex OBJECT-TYPE SYNTAX Integer32 (1..2147483647) MAX-ACCESS not-accessible STATUS current DESCRIPTION "Index used for the identification of filters (note that LLC filter order is irrelevant)." ::= { docsDevFilterLLCEntry 1 } docsDevFilterLLCStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "Controls and reflects the status of rows in this table. There is no restriction on changing any of the associated columns for this row while this object is set to active." ::= { docsDevFilterLLCEntry 2} Expires April 1999 [Page 24] INTERNET-DRAFT MCNS Cable Device MIB October 1998 docsDevFilterLLCIfIndex OBJECT-TYPE SYNTAX InterfaceIndexOrZero MAX-ACCESS read-create STATUS current DESCRIPTION "The entry interface to which this filter applies. The value corresponds to ifIndex for either a CATV MAC or another network interface. If the value is zero, the filter applies to all interfaces. In Cable Modems, the default value is the customer side interface. In Cable Modem Termination Systems, this object has to be specified to create a row in this table." ::= { docsDevFilterLLCEntry 3 } docsDevFilterLLCProtocolType OBJECT-TYPE SYNTAX INTEGER { ethertype(1), dsap(2) } MAX-ACCESS read-create STATUS current DESCRIPTION "The format of the value in docsDevFilterLLCProtocol: either a two-byte Ethernet Ethertype, or a one-byte 802.2 SAP value. EtherType(1) also applies to SNAP- encapsulated frames." DEFVAL { ethertype } ::= { docsDevFilterLLCEntry 4 } docsDevFilterLLCProtocol OBJECT-TYPE SYNTAX Integer32 (0..65535) MAX-ACCESS read-create STATUS current DESCRIPTION "The layer three protocol for which this filter applies. The protocol value format depends on docsDevFilterLLCProtocolType. Note that for SNAP frames, etherType filtering is performed rather than DSAP=0xAA." DEFVAL { 0 } ::= { docsDevFilterLLCEntry 5 } docsDevFilterLLCMatches OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "Counts the number of times this filter was matched." ::= { docsDevFilterLLCEntry 6 } -- The default behavior for (bridged) packets that do not match IP -- filters is defined by -- docsDevFilterIpDefault. Expires April 1999 [Page 25] INTERNET-DRAFT MCNS Cable Device MIB October 1998 docsDevFilterIpDefault OBJECT-TYPE SYNTAX INTEGER { discard(1), accept(2) } MAX-ACCESS read-write STATUS current DESCRIPTION "If set to discard(1), all packets not matching an IP filter will be discarded. If set to accept(2), all packets not matching an IP filter will be accepted for further processing (e.g., bridging). At initial system startup, this object returns accept(2)." ::= { docsDevFilter 3 } docsDevFilterIpTable OBJECT-TYPE SYNTAX SEQUENCE OF DocsDevFilterIpEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An ordered list of filters or classifiers to apply to IP traffic. Filter application is ordered by the filter index, rather than by a best match algorithm (Note that this implies that the filter table may have gaps in the index values). Packets which match no filters will have policy 0 in the docsDevPolicyTable applied to them if it exists. Otherwise, Packets which match no filters are discarded or forwarded according to the setting of docsDevFilterIpDefault." ::= { docsDevFilter 4 } docsDevFilterIpEntry OBJECT-TYPE SYNTAX DocsDevFilterIpEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Describes a filter to apply to IP traffic received on a specified interface. Both source and destination addresses must match for the filter to apply. To create an entry in this table, docsDevFilterIpIfIndex must be specified." INDEX { docsDevFilterIpIndex } ::= { docsDevFilterIpTable 1 } DocsDevFilterIpEntry ::= SEQUENCE { docsDevFilterIpIndex Integer32, docsDevFilterIpStatus RowStatus, docsDevFilterIpControl INTEGER, docsDevFilterIpIfIndex InterfaceIndexOrZero, docsDevFilterIpDirection INTEGER, docsDevFilterIpBroadcast TruthValue, docsDevFilterIpSaddr IpAddress, Expires April 1999 [Page 26] INTERNET-DRAFT MCNS Cable Device MIB October 1998 docsDevFilterIpSmask IpAddress, docsDevFilterIpDaddr IpAddress, docsDevFilterIpDmask IpAddress, docsDevFilterIpProtocol Integer32, docsDevFilterIpSourcePortLow Integer32, docsDevFilterIpSourcePortHigh Integer32, docsDevFilterIpDestPortLow Integer32, docsDevFilterIpDestPortHigh Integer32, docsDevFilterIpMatches Counter32, docsDevFilterIpTos OCTET STRING, docsDevFilterIpTosMask OCTET STRING, docsDevFilterIpContinue TruthValue, docsDevFilterIpPolicyId Integer32 } docsDevFilterIpIndex OBJECT-TYPE SYNTAX Integer32 (1..2147483647) MAX-ACCESS not-accessible STATUS current DESCRIPTION "Index used to order the application of filters. The filter with the lowest index is always applied first." ::= { docsDevFilterIpEntry 1 } docsDevFilterIpStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "Controls and reflects the status of rows in this table. Specifying only this object (with the appropriate index) on a CM is sufficient to create a filter row which matches all inbound packets on the ethernet interface, and results in the packets being discarded. docsDevFilterIpIfIndex (at least) must be specificed on a CMTS to create a row. Creation of the rows may be done via either create-and-wait or create-and-go, but the filter is not applied until this object is set to (or changes to) active. There is no restriction in changing any object in a row while this object is set to active." ::= { docsDevFilterIpEntry 2 } docsDevFilterIpControl OBJECT-TYPE SYNTAX INTEGER { discard(1), accept(2), policy(3) } MAX-ACCESS read-create STATUS current Expires April 1999 [Page 27] INTERNET-DRAFT MCNS Cable Device MIB October 1998 DESCRIPTION "If set to discard(1), all packets matching this filter will be discarded and scanning of the remainder of the filter list will be aborted. If set to accept(2), all packets matching this filter will be accepted for further processing (e.g., bridging). If docsDevFilterIpContinue is set to true, see if there are other matches, otherwise done. If set to policy (3), execute the policy entries matched by docsDevIpFilterPolicyId. If is docsDevFilterIpContinue set to true see if there are other matches, otherwise done." DEFVAL { discard } ::= { docsDevFilterIpEntry 3 } docsDevFilterIpIfIndex OBJECT-TYPE SYNTAX InterfaceIndexOrZero MAX-ACCESS read-create STATUS current DESCRIPTION "The entry interface to which this filter applies. The value corresponds to ifIndex for either a CATV MAC or another network interface. If the value is zero, the filter applies to all interfaces. Default value in Cable Modems is the index of the customer-side (e.g. ethernet) interface. In Cable Modem Termination Systems, this object MUST be specified to create a row in this table." ::= { docsDevFilterIpEntry 4 } docsDevFilterIpDirection OBJECT-TYPE SYNTAX INTEGER { inbound(1), outbound(2), both(3) } MAX-ACCESS read-create STATUS current DESCRIPTION "Determines whether the filter is applied to inbound(1) traffic, outbound(2) traffic, or traffic in both(3) directions." DEFVAL { inbound } ::= { docsDevFilterIpEntry 5 } docsDevFilterIpBroadcast OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-create STATUS current DESCRIPTION "If set to true(1), the filter only applies to multicast and broadcast traffic. If set to false(2), the filter applies to all traffic." DEFVAL { false } Expires April 1999 [Page 28] INTERNET-DRAFT MCNS Cable Device MIB October 1998 ::= { docsDevFilterIpEntry 6 } docsDevFilterIpSaddr OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-create STATUS current DESCRIPTION "The source IP address, or portion thereof, that is to be matched for this filter." DEFVAL { '00000000'h } ::= { docsDevFilterIpEntry 7 } docsDevFilterIpSmask OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-create STATUS current DESCRIPTION "A bit mask that is to be applied to the source address prior to matching. This mask is not necessarily the same as a subnet mask, but 1's bits must be leftmost and contiguous." DEFVAL { '00000000'h } ::= { docsDevFilterIpEntry 8 } docsDevFilterIpDaddr OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-create STATUS current DESCRIPTION "The destination IP address, or portion thereof, that is to be matched for this filter " DEFVAL { '00000000'h } ::= { docsDevFilterIpEntry 9 } docsDevFilterIpDmask OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-create STATUS current DESCRIPTION "A bit mask that is to be applied to the destination address prior to matching. This mask is not necessarily the same as a subnet mask, but 1's bits must be leftmost and contiguous." DEFVAL { '00000000'h } ::= { docsDevFilterIpEntry 10 } docsDevFilterIpProtocol OBJECT-TYPE SYNTAX Integer32 (0..256) MAX-ACCESS read-create STATUS current DESCRIPTION "The IP protocol value that is to be matched. For example: Expires April 1999 [Page 29] INTERNET-DRAFT MCNS Cable Device MIB October 1998 icmp is 1, tcp is 6, udp is 17. A value of 256 matches ANY protocol." DEFVAL { 256 } ::= { docsDevFilterIpEntry 11 } docsDevFilterIpSourcePortLow OBJECT-TYPE SYNTAX Integer32 (0..65535) MAX-ACCESS read-create STATUS current DESCRIPTION "If docsDevFilterIpProtocol is udp or tcp, this is the inclusive lower bound of the transport-layer source port range that is to be matched." DEFVAL { 0 } ::= { docsDevFilterIpEntry 12 } docsDevFilterIpSourcePortHigh OBJECT-TYPE SYNTAX Integer32 (0..65535) MAX-ACCESS read-create STATUS current DESCRIPTION "If docsDevFilterIpProtocol is udp or tcp, this is the inclusive upper bound of the transport-layer source port range that is to be matched." DEFVAL { 65535 } ::= { docsDevFilterIpEntry 13 } docsDevFilterIpDestPortLow OBJECT-TYPE SYNTAX Integer32 (0..65535) MAX-ACCESS read-create STATUS current DESCRIPTION "If docsDevFilterIpProtocol is udp or tcp, this is the inclusive lower bound of the transport-layer destination port range that is to be matched." DEFVAL { 0 } ::= { docsDevFilterIpEntry 14 } docsDevFilterIpDestPortHigh OBJECT-TYPE SYNTAX Integer32 (0..65535) MAX-ACCESS read-create STATUS current DESCRIPTION "If docsDevFilterIpProtocol is udp or tcp, this is the inclusive upper bound of the transport-layer destination port range that is to be matched." DEFVAL { 65535 } ::= { docsDevFilterIpEntry 15 } docsDevFilterIpMatches OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only Expires April 1999 [Page 30] INTERNET-DRAFT MCNS Cable Device MIB October 1998 STATUS current DESCRIPTION "Counts the number of times this filter was matched. This object is initialized to 0 at boot, or at row creation, and is reset only upon reboot." ::= { docsDevFilterIpEntry 16 } docsDevFilterIpTos OBJECT-TYPE SYNTAX OCTET STRING ( SIZE (1)) MAX-ACCESS read-create STATUS current DESCRIPTION "This is the value to be matched to the packet's TOS (Type of Service) value (after the TOS value is AND'd with docsDevFilterIpTosMask)." DEFVAL { '00'h } ::= { docsDevFilterIpEntry 17 } docsDevFilterIpTosMask OBJECT-TYPE SYNTAX OCTET STRING ( SIZE (1) ) MAX-ACCESS read-create STATUS current DESCRIPTION "The mask to be applied to the packet's TOS value before matching." DEFVAL { '00'h } ::= { docsDevFilterIpEntry 18 } docsDevFilterIpContinue OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-create STATUS current DESCRIPTION "If this value is set to true, and docsDevFilterIpControl is anything but discard (1), continue scanning and applying policies." DEFVAL { false } ::= { docsDevFilterIpEntry 19 } docsDevFilterIpPolicyId OBJECT-TYPE SYNTAX Integer32 (0..2147483647) MAX-ACCESS read-create STATUS current DESCRIPTION "This object points to an entry in docsDevFilterPolicyTable. If docsDevFilterIpControl is set to policy (3), execute all matching policies in docsDevFilterPolicyTable. If no matching policy exists, treat as if docsDevFilterIpControl were set to accept (1). If this object is set to the value of 0, there is no matching policy, and docsDevFilterPolicyTable MUST NOT be consulted." Expires April 1999 [Page 31] INTERNET-DRAFT MCNS Cable Device MIB October 1998 DEFVAL { 0 } ::= { docsDevFilterIpEntry 20 } -- -- docsDevFilterPolicyTable exists to allow multiple policy actions -- to be applied to any given classified packet. The policy actions -- are applied in index order For example: -- -- Index ID Type Action -- 1 1 TOS 1 -- 12 1 IPSEC 3 -- 9 5 TOS 1 -- This says that a packet which matches a filter with policy id 1, -- first has TOS policy 1 applied (which might set the TOS bits to -- enable a higher priority), and next has the IPSEC policy 3 applied -- (which may result in the packet being dumped into a secure VPN to a -- remote encryptor). -- docsDevFilterPolicyTable OBJECT-TYPE SYNTAX SEQUENCE OF DocsDevFilterPolicyEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A Table which maps between a policy ID and a set of policies to be applied." ::= { docsDevFilter 5 } docsDevFilterPolicyEntry OBJECT-TYPE SYNTAX DocsDevFilterPolicyEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the docsDevFilterPolicyTable. Entries are created by Network Management. To create an entry, docsDevFilterPolicyId and docsDevFilterPolicyAction must be specified." INDEX { docsDevFilterPolicyIndex } ::= { docsDevFilterPolicyTable 1 } DocsDevFilterPolicyEntry ::= SEQUENCE { docsDevFilterPolicyIndex Integer32, docsDevFilterPolicyId Integer32, docsDevFilterPolicyType INTEGER, docsDevFilterPolicyAction Integer32, docsDevFilterPolicyStatus RowStatus } docsDevFilterPolicyIndex OBJECT-TYPE SYNTAX Integer32 (1..2147483647) MAX-ACCESS not-accessible Expires April 1999 [Page 32] INTERNET-DRAFT MCNS Cable Device MIB October 1998 STATUS current DESCRIPTION "Index value for the table." ::= { docsDevFilterPolicyEntry 1 } docsDevFilterPolicyId OBJECT-TYPE SYNTAX Integer32 (0..2147483647) MAX-ACCESS read-create STATUS current DESCRIPTION "Policy ID for this entry. A policy ID can apply to multiple rows of this table, all relevant policies are executed. Policy 0 (if populated) is applied to all packets which do not match any of the filters. N.B. If docsDevFilterIpPolicyId is set to 0, it DOES NOT match policy 0 of this table. " ::= { docsDevFilterPolicyEntry 2 } docsDevFilterPolicyType OBJECT-TYPE SYNTAX INTEGER { other(1), tos (2) } MAX-ACCESS read-create STATUS current DESCRIPTION "The policy type to execute. For tos(1), look at the docsDevFilterTosTable table. This version of the Cable Device MIB only defines a policy type of tos(2). Other policy types will require further study. A policy type of other(1) indicates a vendor specific extension. An attempt to set this value to other(1) where a vendor extension does not exist will result on a returned error of badValue." DEFVAL { tos } ::= { docsDevFilterPolicyEntry 3 } docsDevFilterPolicyAction OBJECT-TYPE SYNTAX Integer32 (1..2147483647) MAX-ACCESS read-create STATUS current DESCRIPTION "Index into the table identified by docsDevFilterPolicyType. For a policy type of tos(2), this is an index into docsDevFilterTosTable. For a policy type of other(1), this is a pointer into a vendor specified table." ::= { docsDevFilterPolicyEntry 4 } docsDevFilterPolicyStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current Expires April 1999 [Page 33] INTERNET-DRAFT MCNS Cable Device MIB October 1998 DESCRIPTION "Object used to create an entry in this table." ::= { docsDevFilterPolicyEntry 5 } -- This table deserves a bit of explanation. If a packet makes it -- through the classifier and ends up in this table, do: -- Set the tosBits of the packet to -- (tosBits && docsDevFilterTosAndMask) || docsDevFilterTosOrMask -- -- This construct allows you to do a clear and set of all the bits in -- a flexible manner. docsDevFilterTosTable OBJECT-TYPE SYNTAX SEQUENCE OF DocsDevFilterTosEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Table used to describe Type of Service (TOS) bits processing." ::= { docsDevFilter 6 } docsDevFilterTosEntry OBJECT-TYPE SYNTAX DocsDevFilterTosEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A TOS policy entry." INDEX { docsDevFilterTosIndex } ::= { docsDevFilterTosTable 1 } DocsDevFilterTosEntry ::= SEQUENCE { docsDevFilterTosIndex Integer32, docsDevFilterTosStatus RowStatus, docsDevFilterTosAndMask OCTET STRING (SIZE (1)), docsDevFilterTosOrMask OCTET STRING (SIZE (1)) } docsDevFilterTosIndex OBJECT-TYPE SYNTAX Integer32 (1..2147483647) MAX-ACCESS not-accessible STATUS current DESCRIPTION "The unique index for this row. There are no ordering requirements for this table and any valid index may be specified." ::= { docsDevFilterTosEntry 1 } docsDevFilterTosStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION Expires April 1999 [Page 34] INTERNET-DRAFT MCNS Cable Device MIB October 1998 "The object used to create and delete entries in this table. A row created by specifying just this object results in a row which specifies no change to the TOS bits. A row may be created using either the create-and-go or create-and-wait paradigms. There is no restriction on the ability to change values in this row while the row is active." ::= { docsDevFilterTosEntry 2 } docsDevFilterTosAndMask OBJECT-TYPE SYNTAX OCTET STRING (SIZE (1)) MAX-ACCESS read-create STATUS current DESCRIPTION "This value is AND'd with the matched packet's TOS bits." DEFVAL { 'ff'h } ::= { docsDevFilterTosEntry 3 } docsDevFilterTosOrMask OBJECT-TYPE SYNTAX OCTET STRING (SIZE (1)) MAX-ACCESS read-create STATUS current DESCRIPTION "After AND'ing with the above bits, the packet's TOS bits are OR'd with these bits." DEFVAL { '00'h } ::= { docsDevFilterTosEntry 4 } -- -- CPE IP Management and anti spoofing group. Only implemented on -- Cable Modems. -- docsDevCpe OBJECT IDENTIFIER ::= { docsDevMIBObjects 7} docsDevCpeEnroll OBJECT-TYPE SYNTAX INTEGER { none(1), any(2) } MAX-ACCESS read-write STATUS current DESCRIPTION "This object controls the population of docsDevFilterCpeTable. If set to none, the filters must be set manually. If set to any, the CM wiretaps the packets originating from the ethernet and enrolls up to docsDevFilterMaxCpe addresses based on the source IP addresses of those packets. At initial system startup, default value for this object is any(2)." ::= { docsDevCpe 1 } Expires April 1999 [Page 35] INTERNET-DRAFT MCNS Cable Device MIB October 1998 docsDevCpeMax OBJECT-TYPE SYNTAX Integer32 (-1..2147483647) MAX-ACCESS read-write STATUS current DESCRIPTION "This object controls the maximum number of CPEs allowed to connect behind this device. If set to zero, any number of CPEs may connect up to the maximum permitted for the device. If set to -1, no filtering is done on CPE source addresses, and no entries are made in the docsDevFilterCpeTable. If an attempt is made to set this to a number greater than that permitted for the device, it is set to that maximum. At iniitial system startup, default value for this object is 1." ::= { docsDevCpe 2 } -- docsDevFilterDhcpGrace was deleted docsDevCpeTable OBJECT-TYPE SYNTAX SEQUENCE OF DocsDevCpeEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table list the IP addresses seen as source addresses in packets originating from the customer interface on this device. In addition, this table can be provisioned with the specific addresses permitted for the CPEs via the normal row creation mechanisms." ::= { docsDevCpe 3 } docsDevCpeEntry OBJECT-TYPE SYNTAX DocsDevCpeEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the docsDevFilterCpeTable. There is one entry for each CPE seen or provisioned. If docsDevFilterMaxCpe is set to -1, this table is ignored, otherwise: Upon receipt of a packet from the customer interface of the CM, the source address is checked against this table. If the address is in the table, packet processing continues. If the address is not in the table, but docsDevCpeEnroll is set to any and the table size is less than docsDevFilterMaxCpe, the address is added to the table and packet processing continues. Otherwise, the packet is dropped." INDEX { docsDevCpeIp } ::= {docsDevCpeTable 1 } DocsDevCpeEntry ::= SEQUENCE { docsDevCpeIp IpAddress, Expires April 1999 [Page 36] INTERNET-DRAFT MCNS Cable Device MIB October 1998 docsDevCpeSource INTEGER, docsDevCpeStatus RowStatus } docsDevCpeIp OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS not-accessible STATUS current DESCRIPTION "The IP address to which this entry applies." ::= { docsDevCpeEntry 1 } docsDevCpeSource OBJECT-TYPE SYNTAX INTEGER { other(1), manual(2), learned(3) } MAX-ACCESS read-only STATUS current DESCRIPTION "This object describes how this entry was created. If the value is manual(2), this row was created by a network management action (either configuration, or SNMP set). If set to learned(3), then it was found via looking at the source IP addresses." -- DEFVAL { set } ::= { docsDevCpeEntry 2 } -- docsDevFilterCpeExpires was deleted. docsDevCpeStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "Standard object to manipulate rows. To create a row in this table, you only need to specify this object. Management stations SHOULD use the create-and-go mechanism for creating rows in this table." ::= { docsDevCpeEntry 3 } -- -- Placeholder for notifications/traps. -- docsDevNotification OBJECT IDENTIFIER ::= { docsDev 2 } -- -- Conformance definitions -- docsDevConformance OBJECT IDENTIFIER ::= { docsDev 3 } Expires April 1999 [Page 37] INTERNET-DRAFT MCNS Cable Device MIB October 1998 docsDevGroups OBJECT IDENTIFIER ::= { docsDevConformance 1 } docsDevCompliances OBJECT IDENTIFIER ::= { docsDevConformance 2 } docsDevBasicCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for MCNS Cable Modems and Cable Modem Termination Systems." MODULE -- docsDev -- conditionally mandatory groups GROUP docsDevBaseGroup DESCRIPTION "Mandatory in Cable Modems, optional in Cable Modem Termination Systems." GROUP docsDevEventGroup DESCRIPTION "Mandatory in Cable Modems, optional in Cable Modem Termination Systems." GROUP docsDevFilterGroup DESCRIPTION "Mandatory in Cable Modems, optional in Cable Modem Termination Systems." GROUP docsDevNmAccessGroup DESCRIPTION "This group is Mandatory in Cable Modems and is optional in Cable Modem Termination Systems." GROUP docsDevServerGroup DESCRIPTION "This group is implemented only in Cable Modems and is not implemented in Cable Modem Termination Systems." GROUP docsDevSoftwareGroup DESCRIPTION "This group is Mandatory in Cable Modems and optional in Cable Modem Termination Systems." GROUP docsDevCpeGroup DESCRIPTION "This group is Mandatory in Cable Modems, and is not implemented in Cable Modem Termination Systems. A similar capability for CMTS devices may be proposed later after study." OBJECT docsDevSTPControl MIN-ACCESS read-only Expires April 1999 [Page 38] INTERNET-DRAFT MCNS Cable Device MIB October 1998 DESCRIPTION "It is compliant to implement this object as read-only. Devices need only support noStFilterBpdu(2)." OBJECT docsDevEvReporting MIN-ACCESS read-only DESCRIPTION "It is compliant to implement this object as read-only. Devices need only support local(0)." ::= { docsDevCompliances 1 } docsDevBaseGroup OBJECT-GROUP OBJECTS { docsDevRole, docsDevDateTime, docsDevResetNow, docsDevSerialNumber, docsDevSTPControl } STATUS current DESCRIPTION "A collection of objects providing device status and control." ::= { docsDevGroups 1 } docsDevNmAccessGroup OBJECT-GROUP OBJECTS { docsDevNmAccessIp, docsDevNmAccessIpMask, docsDevNmAccessCommunity, docsDevNmAccessControl, docsDevNmAccessInterfaces, docsDevNmAccessStatus } STATUS current DESCRIPTION "A collection of objects for controlling access to SNMP objects." ::= { docsDevGroups 2 } docsDevSoftwareGroup OBJECT-GROUP OBJECTS { docsDevSwServer, docsDevSwFilename, docsDevSwAdminStatus, docsDevSwOperStatus, docsDevSwCurrentVers } STATUS current DESCRIPTION "A collection of objects for controlling software Expires April 1999 [Page 39] INTERNET-DRAFT MCNS Cable Device MIB October 1998 downloads." ::= { docsDevGroups 3 } docsDevServerGroup OBJECT-GROUP OBJECTS { docsDevServerBootState, docsDevServerDhcp, docsDevServerTime, docsDevServerTftp, docsDevServerConfigFile } STATUS current DESCRIPTION "A collection of objects providing status about server provisioning." ::= { docsDevGroups 4 } docsDevEventGroup OBJECT-GROUP OBJECTS { docsDevEvControl, docsDevEvSyslog, docsDevEvThrottleAdminStatus, docsDevEvThrottleInhibited, docsDevEvThrottleThreshold, docsDevEvThrottleInterval, docsDevEvReporting, docsDevEvFirstTime, docsDevEvLastTime, docsDevEvCounts, docsDevEvLevel, docsDevEvId, docsDevEvText } STATUS current DESCRIPTION "A collection of objects used to control and monitor events." ::= { docsDevGroups 5 } docsDevFilterGroup OBJECT-GROUP OBJECTS { docsDevFilterLLCDefault, docsDevFilterIpDefault, docsDevFilterLLCStatus, docsDevFilterLLCIfIndex, docsDevFilterLLCProtocolType, docsDevFilterLLCProtocol, docsDevFilterLLCMatches, docsDevFilterIpControl, docsDevFilterIpIfIndex, docsDevFilterIpStatus, docsDevFilterIpDirection, Expires April 1999 [Page 40] INTERNET-DRAFT MCNS Cable Device MIB October 1998 docsDevFilterIpBroadcast, docsDevFilterIpSaddr, docsDevFilterIpSmask, docsDevFilterIpDaddr, docsDevFilterIpDmask, docsDevFilterIpProtocol, docsDevFilterIpSourcePortLow, docsDevFilterIpSourcePortHigh, docsDevFilterIpDestPortLow, docsDevFilterIpDestPortHigh, docsDevFilterIpMatches, docsDevFilterIpTos, docsDevFilterIpTosMask, docsDevFilterIpContinue, docsDevFilterIpPolicyId, docsDevFilterPolicyId, docsDevFilterPolicyType, docsDevFilterPolicyAction, docsDevFilterPolicyStatus, docsDevFilterTosStatus, docsDevFilterTosAndMask, docsDevFilterTosOrMask -- docsDevFilterCpeEnroll, -- docsDevFilterMaxCpe, -- docsDevFilterDhcpGrace, -- docsDevFilterCpeSource, -- docsDevFilterCpeExpires, -- docsDevFilterCpeStatus } STATUS current DESCRIPTION "A collection of objects to specify filters at link layer and IP layer." ::= { docsDevGroups 6 } docsDevCpeGroup OBJECT-GROUP OBJECTS { docsDevCpeEnroll, docsDevCpeMax, docsDevCpeSource, docsDevCpeStatus } STATUS current DESCRIPTION "A collection of objects used to control the number and specific values of IP addresses allowed for associated Customer Premises Equipment (CPE)." ::= { docsDevGroups 7 } END Expires April 1999 [Page 41] INTERNET-DRAFT MCNS Cable Device MIB October 1998 5. Acknowledgments This document was produced by the IPCDN Working Group. It is based on a document written by Pam Anderson from CableLabs, Wilson Sawyer from BayNetworks, and Rich Woundy from Continental Cablevision. Special thanks is also due to Azlina Palmer, who helped a lot reviewing the document. 6. References [1] Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture for Describing SNMP Management Frameworks", RFC 2271, Cabletron Systems, Inc., BMC Software, Inc., IBM T. J. Watson Research, January 1998 [2] Rose, M., and K. McCloghrie, "Structure and Identification of Management Information for TCP/IP-based Internets", RFC 1155, Performance Systems International, Hughes LAN Systems, May 1990 [3] Rose, M., and K. McCloghrie, "Concise MIB Definitions", RFC 1212, Performance Systems International, Hughes LAN Systems, March 1991 [4] M. Rose, "A Convention for Defining Traps for use with the SNMP", RFC 1215, Performance Systems International, March 1991 [5] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Structure of Management Information for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1902, SNMP Research,Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc., International Network Services, January 1996. [6] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Textual Conventions for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1903, SNMP Research, Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc., International Network Services, January 1996. [7] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Conformance Statements for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1904, SNMP Research, Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc., International Network Services, January 1996. [8] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple Network Management Protocol", RFC 1157, SNMP Research, Performance Systems International, Performance Systems International, MIT Laboratory for Computer Science, May 1990. [9] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Introduction to Community-based SNMPv2", RFC 1901, SNMP Research, Expires April 1999 [Page 42] INTERNET-DRAFT MCNS Cable Device MIB October 1998 Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc., International Network Services, January 1996. [10] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1906, SNMP Research, Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc., International Network Services, January 1996. [11] Case, J., Harrington D., Presuhn R., and B. Wijnen, "Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)", RFC 2272, SNMP Research, Inc., Cabletron Systems, Inc., BMC Software, Inc., IBM T. J. Watson Research, January 1998. [12] Blumenthal, U., and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", RFC 2274, IBM T. J. Watson Research, January 1998. [13] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1905, SNMP Research, Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc., International Network Services, January 1996. [14] Levi, D., Meyer, P., and B. Stewart, "SNMPv3 Applications", RFC 2273, SNMP Research, Inc., Secure Computing Corporation, Cisco Systems, January 1998 [15] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", RFC 2275, IBM T. J. Watson Research, BMC Software, Inc., Cisco Systems, Inc., January 1998 [16] " Data-Over-Cable Service Interface Specifications: Cable Modem Radio Frequency Interface Specification SP-RFI-I04-980724", DOCSIS, July 1998, http://www.cablemodem.com/public/pubtechspec/SP-RFI- I04-980724.pdf. [17] L. Steinberg, "Techniques for Managing Asynchronously Generated Alerts", RFC 1224, May 1991. [18] "Data-Over-Cable Service Interface Specifications: Operations Support System Interface Specification RF Interface SP-OSSI-RF- I02-980410", DOCSIS, April 1998, http://www.cablemodem.com/public/pubtechspec/ossi/sp-ossi.PDF. [19] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", RFC2119, Harvard University, March 1997 [20] "Data-Over-Cable Service Interface Specifications: Baseline Privacy Interface Specification SP-BPI-I01-970922", DOCSIS, September 1977, http://www.cablemodem.com/public/pubtechspec/ss/SP-BPI-I01- Expires April 1999 [Page 43] INTERNET-DRAFT MCNS Cable Device MIB October 1998 970922.pdf 7. Security Considerations This MIB relates to a system which will provide metropolitan public internet access. As such, improper manipulation of the objects represented by this MIB may result in denial of service to a large number of end-users. In addition, manipulation of the docsDevNmAccessTable, docsDevFilterLLCTable, docsDevFilterIpTable and the elements of the docsDevCpe group may allow an end-user to increase their service levels, spoof their IP addresses, change the permitted management stations, or affect other end-users in either a positive or negative manner. The use of docsDevNmAccessTable to specify management stations is considered to be only limited protection and does not protect against attacks which spoof the management station's IP address. The use of stronger mechanisms such as SNMPv3 security should be considered where possible. This MIB does not affect confidentiality of services on a cable modem system. [20] specifies the implementation of the DOCSIS Baseline privacy mechanism. The working group expects to issue a MIB for the management of this mechanism at a later time. 8. Intellectual Property The IETF takes no position regarding the validity or scope of any intellectual property or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; neither does it represent that it has made any effort to identify any such rights. Information on the IETF's procedures with respect to rights in standards-track and standards- related documentation can be found in BCP-11. Copies of claims of rights made available for publication and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementors or users of this specification can be obtained from the IETF Secretariat. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights which may cover technology that may be required to practice this standard. Please address the information to the IETF Executive Director. 9. Copyright Section Copyright (C) The Internet Society 1998. All Rights Reserved. Expires April 1999 [Page 44] INTERNET-DRAFT MCNS Cable Device MIB October 1998 This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implmentation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 10. Author's Address Guenter Roeck cisco Systems 170 West Tasman Drive San Jose, CA 95134 U.S.A. Phone: +1 408 527 3143 Email: groeck@cisco.com Expires April 1999 [Page 45]