I2RS working group S. Hares
Internet-Draft Huawei
Intended status: Standards Track S. Kini
Expires: December 25, 2016 Ericsson
L. Dunbar
Huawei
R. Krishnan
Dell
D. Bogdanovic
Juniper Networks
R. White
Linkedin
June 23, 2016

Filter-Based RIB Data Model
draft-ietf-i2rs-fb-rib-data-model-00

Abstract

This document defines a data model to support the Filter-based Routing Information Base (RIB) Yang data models for I2RS. A routing system uses the Filter-based RIB to program FIB entries that process incoming packets by matching on multiple fields within the packet and then performing a specified action on it. The FB-RIB can also specify an action to forward the packet according to the FIB entries programmed using the RIBs of its routing instance.

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at http://datatracker.ietf.org/drafts/current/.

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This Internet-Draft will expire on December 25, 2016.

Copyright Notice

Copyright (c) 2016 IETF Trust and the persons identified as the document authors. All rights reserved.

This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License.


Table of Contents

1. Introduction

The Interface to the Routing System (I2RS) [I-D.ietf-i2rs-architecture] architecture provides dynamic read and write access to the information and state within the routing elements. The I2RS client interacts with the I2RS agent in one or more network routing systems.

This document provides a yang module for the I2RS filter Based Routing Information Base (FB-RIB) and describes the I2RS interaction with routing filters within a routing element. The informational model for the FB-RIB is in [I-D.kini-i2rs-fb-rib-info-model]

1.1. Definition of I2RS Filter Based RIB

Filter-based routing is a technique used to make packet forwarding decisions based on a filter that is matched to the incoming packets and the specified action. It should be noted that that this is distinct from the static routes in the RIB [I-D.ietf-i2rs-rib-info-model] where the routing is destination ddress based.

A Filter-Based RIB (Routing Information Base) is contained in a routing instance (defined in [I-D.ietf-i2rs-rib-info-model]). It contains a list of filters (match-action conditions) and a list of interfaces the filter-based forwarding operates on, and default RIB(s).

A Filter Based RIB uses packet forwarding policy. If packet reception is considered an event, then the I2RS Filter-based RIB uses a minimalistic Event-matchCondition-Action policy with the following characteristics:

A Filter-based RIB entry specifies match filters for the fields in a packet (which may include layer 1 to layer 3 header fields, transport or application fields) or size of the packet or interface received on. The matches are contained in an ordered list of filters which contain pairs of match condition-action (aka event-condition-action).

If all matches fail, default action is to forward the packet using Destination Based forward from the default RIB(s). The default RIBs can be:

Actions in the condition-action pair may impact forwarding or set something in the packet that will impact forwarding. Policy actions are typically applied before applying QoS constraints since policy actions may override QoS constraint.

The Filter-Based RIB resides in ephemeral state as does the I2RS RIB and I2RS topology models.

2. Requirements Language

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 [RFC2119].

In this document, these words will appear with that interpretation only when in ALL CAPS. Lower case uses of these words are not to be interpreted as carrying RFC-2119 significance.

3. Definitions and Acronyms

CLI


Command Line Interface
FB-RIB


Filter-Based Routing Information Base
FB-Route


The policy rules in the filter-based RIB are prescriptive of the Event-Condition-Action form which is often represented by if Condition then action".
Policy Group


Policy Groups are groups of policy rules. The groups of policy in the basic network policy [I-D.hares-i2rs-pkt-eca-data-model] allow grouping of policy by name. This structure allow easier management of customer-based or provider based filters, but does not change the policy-rules list.
RIB IM


RIB Informational Model (RIB IM) [I-D.ietf-i2rs-rib-info-model]
Routing instance


A routing instance, in the context of the FB-FIB is a collection of RIBs, interfaces, and routing parameters. A routing instance creates a logical slice of the router and allows different logical slices; across a set of routers; to communicate with each other.

4. High level Yang structure for the FB-RIB

There are three levels in the Filter-Based RIB (FB-RIB) structure:

All structures have two types: configuration/ephemeral state and operational state.

This yang model describes three types of FB-RIBS: configuration, I2RS, and BGP Flow Specification. The configuration FB-RIB yang module is config state ("config true" and "ephemeral false") and survives a reboot. The I2RS FB-RB yang model is reboot ephemeral ("config true" and "ephemeral true;"). The BGP Flow Specification Filter-Based RIB stores policy which is received by the BGP peers. The BGP configuration contains a flow-specification as part of its configuration, and the ability to export this flow specification to other BGP peers. The BGP local configuration with the flow specification is consider ("config true"), and it is possible to be ephemeral ("ephemeral true") or local configuration ("ephemeral false" ). The BGP flow specifications received from peers are derived state, just like other BGP dervised state.

 

Configuration RIBS 
	 
   +-----------------------------------------+
   |     routing instance                    |
   +-------|-------------|----------------|--+
           |             |                |
           |             |                |
 +---------|----+  +-----|-----+ +--------|-----+
 |config-fb-rib |  |i2rs-fb-rib| |bgp-fs-fb-rib |
 |              |  |           | |config only   | 
 +------|-------+  +-----|-----+ +------|-------+
        |............:....|...............|
                     :  (uses common structures
                     :   in separate lists of FB-RIBs) 		
            +--------|----+  
            |fb-ribs*     |  
            |             |  
            +--|----------+  
               |             
       

  Figure 3: Routing instance with three types of 
            Filter-FIB lists

The following section provides the high level yang structure diagrams for the following levels of structures for both config/ephemeral state and operationa.

These structures are contained within the yang section in this draft.

The packet-reception ECA policy yang module is contained in the draft [I-D.hares-i2rs-pkt-eca-data-model].

For those who desire more information regarding the logic behind the I2RS Filter-Based RIB, please see the Informational Model at: [I-D.kini-i2rs-fb-rib-info-model].

4.1. Top Level Yang Structure for ietf-fb-rib

The Top-level Yang structure for a global FB-RIB types (similar to acl) is not defined for filter-based RIBS. The I2RS Filter-Based RIB should be defined under this structure under a routing instance. The three things under this RIB would be: configured Filter-Based RIB (aka Policy routing), I2RS reboot Ephemeral Filter-Based RIB, and BGP Flow Specification's Filter-Based RIB. All of these RIBs have similar actions.

There are two types top-level structures for ietf-fb-ribs: config and operational state.

Augments rt:logical-network-elements:\
        :logical-network-element:network-instances: \
	    network-instance 


ietf-fb-rib module 
  +--rw ietf-fb-rib
     +--rw default-instance-name string 
     +--rw default-router-id rt:router-id
     +--rw config-fb-ribs
	    if-feature "config-filter-based-RIB";
        uses fb-ribs;
     +--rw i2rs-fb-ribs 
		  if-feature "I2RS-filter-based-RIB";
		  uses fb-rib-t:fb-ribs;	
     +--rw bgp-fs-fb-ribs 
		 if-feature "BGP-FS-filter-based-RIB";
		  uses fb-rib-t:fb-ribs;
		
    Figure 5: configuration state   		

The Top-level Yang structure for a global configuration of Filter-Based RIBs are:

Augments rt:logical-network-elements:\
        :logical-network-element:network-instances: \
	    network-instance 
		
ietf-fb-rib module 
  +--rw ietf-fb-rib-opstate
    +--rw default-instance-name string 
    +--rw default-router-id rt:router-id
	+--rw config-fb-rib-opstate 
		  if-feature "config-filter-based-RIB";
		  uses fb-rib-t:fb-ribs-oper-status;
	+--rw i2rs-fb-rib-opstate {
		  if-feature "I2RS-filter-based-RIB";
		  uses fb-rib-t:fb-ribs-oper-status;
	+--rw bgp-fs-fb-rib-opstate 
		  if-feature "BGP-FS-filter-based-RIB";
		  uses fb-rib-t:fb-ribs-oper-status;
		
    Figure 5: operational state   		

The Top-level Yang structure for a global operational state of Filter-Based RIBs are:

4.2. Filter-Based RIB structures

The Top-level yang structures at the Filter-Based RIB level have two types: configuration and operational state.

 module: fb-rib-types:
 +--rw fb-ribs 
    +--rw fb-rib* [rib-name]
    |  +--rw rib-name string
    |  |  rw fb-type identityref / ephemeral or not 
    |  +--rw rib-afi rt:address-family 
    |  +--rw fb-rib-intf* [name] 
    |  |  +--rw name string
    |  |  +--rw intf if:interface 
    |  +--rw default-rib 
    |  |  +--rw rt-rib string 
    |  |  +--rw config-rib string;  // config rib name                     
    |  |  +--rw i2rs-rib:routing-instance:name   
    |  |  +--rw i2rs-rib string;   //ephemeral rib name
    |  |  +--rw bgp-instance-name string 
    |  |  +--rw bgp-rib  string    //session ephemeral 
    |  +--rw fb-rib-refs
    |  |  +--rw fb-rib-update-ref uint32 /count of writes 
    |  +--rw instance-using* 
    |  |   device:networking-instance:networking-instance-name 
    |  +--use pkt-eca:pkt-eca-policy-set
		
rt-rib - refer to static rib.  
		
	  Figure 6: FB RIB Type Structure   
	  

The Top-level Yang structure for the FB-RIB types is:

HIgh Level Yang 

+--rw fb-ribs-oper-status
   +--rw fb-rib-oper-status* [fb-rib-name]
         uses pkt-eca:pkt-eca-opstate 

5. yang models

5.1. Filter-Based RIB types

<CODE BEGINS> file "ietf-fb-rib-types@2016-02-09.yang"
 module ietf-fb-rib-types {

  yang-version "1";

  // namespace
    namespace "urn:ietf:params:xml:ns:yang:ietf-fb-rib-types";
    prefix "fb-rib-t";
	import ietf-interfaces {prefix "if";}
	import ietf-routing {prefix "rt";}
	import ietf-pkt-eca-policy {prefix "pkt-eca";}

  // meta
  organization
    "IETF";

  contact
     "email: shares@ndzh.com;
	  email: sriganesh.kini@ericsson.com
      email: cengiz@packetdesign.com
      email: ivandean@gmal.org 
      email: linda.dunbar@huawei.com;
      email: russ@riw.com;	  
	 ";

  description
    "This module describes a YANG model for the I2RS 
    Filter-based RIB Types.  These types 
    specify types for the Filter-Based RIB.  
	
	Copyright (c) 2015 IETF Trust and the persons identified as
    the document authors.  All rights reserved.

    Redistribution and use in source and binary forms, with or
    without modification, is permitted pursuant to, and subject
    to the license terms contained in, the Simplified BSD
    License set forth in Section 4.c of the IETF Trust's Legal
    Provisions Relating to IETF Documents
    (http://trustee.ietf.org/license-info).";

   
  revision "2016-02-09" {
      description
        "Filter-Based RIB protocol ";
        reference "draft-hares-i2rs-fb-rib-data-model-01";
    }
  
    typedef fb-rib-type-def {
	   type identityref {
	     base "fb-rib-type";
		 }
		description 
		"This type is used to refer to
		 source of Filter-Based RIB: 
		 configuration, I2RS, Flow-Spec.";
     }
	 
	identity fb-rib-type {
		description 
		"This type is used to refer to
		 source of Filter-Based RIB: 
		 configuration, I2RS, Flow-Spec.";
	} 
	 
  	identity fb-rib-config-type {
	   	 base fb-rib-type;
	     description 
	     "config Filter-Based RIB";
	 }
	 
	identity fb-rib-i2rs-ephemeral-type {
	   	 base fb-rib-type;
	     description 
	     "I2RS Reboot ephemeral Filter-Based RIB";
	 }
	 
	identity fb-rib-BGP-FS-type {
	   	 base fb-rib-type;
	     description 
	     "BGP Flow Specification Filter-Based RIB";
	 }
  
    typedef fb-rib-policy-type-def {
	   type identityref {
	     base "fb-rib-policy-type";
		 }
		description 
		"This type is used to refer to FB-RIB type";
     }
	 
	identity fb-rib-policy-type {
	     description 
	     "Types of filter-based policies
		  acl and eca";
	 }
	  
	   identity fb-rib-acl {
	   	  base fb-rib-policy-type;
	      description  
          "filter based policy based on access-lists";
	    }
				
  	   identity fb-bnp-eca-rules {
	   	  base fb-rib-policy-type;
	      description  
          "filter based policy based on qos forwarding rules";
	    }
		
	typedef fb-rules-status  {
	   type identityref {
	     base "fb-rule-opstat";
		 }
		description 
		"This type is used to refer to FB-RIB type";
	 }
	 
	  identity fb-rule-opstat {
		description 
		"operational statues for filter rules
		 inactive and active";
		 }
	 
	  identity fb-rule-inactive {
		base fb-rule-opstat;
		description
		"policy rule is inactive";
	   }
		
	  identity fb-rule-active {
		base fb-rule-opstat;
		description
		"policy rule is active";
	   }
		
	  grouping fb-rib-rule-order-status {
	  leaf statement-order {
	  	  type uint16;
	  	  description "order identifier";
	   }
	   leaf statement-oper_status {
		   type fb-rules-status;
   		   description "status of rule";
		}
		description "filter-rib 
		  policy rule order and status";
	  }
	
     grouping fb-rib-group-order-status {
	  leaf group-refcnt {
	    type uint16; 
	    description "refcnt for this group";
		}
	   leaf group-installed {
	    type uint32;
	    description "number of rules installed";
		}
		leaf group-matches {
		 type uint64;
		 description "number of matches by all
		  rules in group";
		}
		description "fb-rib group list order
		   and status info.";
	  }
	  
	grouping fb-rib-updates {
	   leaf fb-rib-update-ref {
   		 type uint64;
	     description 
		 "number of updates to this FB RIB
		  since last reboot";
	   }
	   description "FB-RIB update info";
	 }	 
	 
	grouping default-fb-rib {
	   // configuration instance for default RIB 
        leaf config-instance {
		type string;
		description "instance name - string until 
		   netmod fixes mount issues";
		}
		leaf config-rib {
		  type string;
		  description "name of config default RIB";
		}	
		//I2RS default instance for default RIB 
	    leaf i2rs-instance-name {
		 type string; 
		 description "I2RS instance name";
		}
		leaf i2rs-rib-name {
			type string;
   	        description "name of default I2RS RIB";
		}	
		leaf bgp-instance-name {
		   type string; 
		   description "name of bgp instance";
		}
		   
		leaf bgp-fs-rib-name {
		    type string;
			description "name of BGP
			 flow specification default RIB";
		}
	    description "default RIB for forwarding 
		   if the policy match";
    }			
	
    grouping fb-ribs {
	    list fb-rib {
		    key fb-rib-name;   
		    leaf fb-rib-name {
		        type string;
				mandatory true;
		        description "RIB name";
            }
		    uses rt:address-family;
		    leaf fb-type {
			    type fb-rib-type-def;
			    description "type of RIB
				list: config, I2RS rebooot
				ephemeral, BGP Flow Specification
				ephemeral. ";
		    }
	        list fb-rib-intf {
			  key "name";
			  leaf name {
				type if:interface-ref;
			    description
			     "A reference to the name of a 
				 configured network layer
			     interface.";
			   }
			  description "This represents 
			    the list of interfaces 
			    associated with this routing instance.  
			    The interface list helps constrain the 
			    boundaries of packet forwarding.
			    Packets coming on these interfaces are 
			    directly associated with the given routing 
			    instance. The interface list contains a 
			    list of identifiers, with each identifier 
			    uniquely identifying an interface.";
	        }
			uses default-fb-rib;  // defaults ribs  
			uses fb-rib-updates;  // write refs to this RIB   
	        list instance-using {
			  key instance-name;
			  leaf instance-name {
			    type string;
			    description 
				" name of instance using this fb-rib
				 rt:routing-instance";
			   }
			  description "instances using
			   this fb-rib";
			}  
		    // ordered rule list + group list  
		    uses pkt-eca:pkt-eca-policy-set;
            			
		  description  "Configuration of 
		     an filter-based rib list";
	    }
	   description "fb-rib group";
    }
	
	grouping fb-ribs-oper-status {
	    list fb-rib-oper-status {
  	      key fb-rib-name;
		  leaf fb-rib-name {
			  type string; 
			  description "rib name";
		  }
          uses pkt-eca:pkt-eca-opstate;
		  description  "Configuration of 
		     an filter-based rib list";
	    }
	   description "list of FB-FIB operational 
	     status";
    }
	
	        			
 } 

<CODE ENDS>

5.2. FB-RIB

 <CODE BEGINS> file "ietf-fb-rib@2016-02-09.yang"
module ietf-fb-rib {
  yang-version "1";
  
  // namespace
  namespace "urn:ietf:params:xml:ns:yang:ietf-fb-rib";
  // replace with iana namespace when assigned
    prefix "fb-rib";


  // import some basic inet types
  import ietf-yang-types {prefix "yang";}
  import ietf-fb-rib-types { prefix "fb-rib-t";}
 
  // meta
  organization
    "IETF";

  contact
     "email: sriganesh.kini@ericsson.com
	  email: cengiz@packetdesign.com
      email: anoop@ieee.duke.edu
      email: ivandean@gmail.org
      email: shares@ndzh.com;	 
      email: linda.dunbar@huawei.com;	
      email: russ@riw.com;  
	 ";

  description
    "This Top level module describes a YANG model for the I2RS 
	Filter-based RIB which is an global protocol independent FB RIB module.";

     revision "2016-02-09" {
       description "initial revision";
       reference "draft-hares-i2rs-fb-rib-data-model-01";
     }
 	
	feature config-filter-based-RIB {
    description 
      "This feature means that a node support
       config filter-based rib.";
    }
 	feature I2RS-filter-based-RIB {
    description 
      "This feature means that a node support
       I2RS filter-based rib.";
    }
   	feature BGP-FS-filter-based-RIB {
    description 
      "This feature means that a node support
      BGP FS filter-based rib.";
    }

	
	 container ietf-fb-rib {
	   presence "top-level structure for
	    configuration";
       leaf default-instance-name {
	     type string;
		 mandatory true;
        description
          "A routing instance is identified by its name,
           INSTANCE_name.  This MUST be unique across all routing
           instances in a given network device.";
         }
	     leaf default-router-id {
		    type yang:dotted-quad; 
		    description "Default router id";
		}
		container config-fb-rib {
		 if-feature config-filter-based-RIB;
		  uses fb-rib-t:fb-ribs;
		 description "config filter-based RIB";
		}
		
 		container i2rs-fb-rib {
		  if-feature I2RS-filter-based-RIB;
		  uses fb-rib-t:fb-ribs;
		 description "bgp-fs filter-based RIB";
		}
		container bgp-fs-fb-rib {
		  if-feature BGP-FS-filter-based-RIB;
		  uses fb-rib-t:fb-ribs;
		 description "bgp fs filter-based RIB";
		}
	   description "fb-rib augments routing instance";
	 }
	 
	container ietf-fb-rib-opstate {
	   presence "top-level structure for
	    op-state";
	   config "false";
       leaf default-instance-name {
	     type string;
		 mandatory true;
        description
          "A routing instance is identified by its name,
           INSTANCE_name.  This MUST be unique across all routing
           instances in a given network device.";
         }
	     leaf default-router-id {
		    type yang:dotted-quad; 
		    description "Default router id";
		}
		container config-fb-rib-opstate {
		  if-feature config-filter-based-RIB;
		  uses fb-rib-t:fb-ribs-oper-status;
		 description "config filter-based RIB";
		}
 		container i2rs-fb-rib-opstate {
		  if-feature I2RS-filter-based-RIB;
		  uses fb-rib-t:fb-ribs-oper-status;
		 description "bgp-fs filter-based RIB";
		}
		container bgp-fs-fb-rib-opstate {
		  if-feature BGP-FS-filter-based-RIB;
		  uses fb-rib-t:fb-ribs-oper-status;
		 description "bgp fs filter-based RIB";
		}
	   description "fb-rib augments routing instance";
	 }
}
	

	
<CODE ENDS>

6. IANA Considerations

TBD

7. Security Considerations

A I2RS RIB is ephemeral data store that will dyanamically change traffic paths set by the routing configuration. An I2RS FB-RIB provides dynamic Event-Condition-Action policy that will further change the operation of forwarding by allow dyanmic policy and ephemeral RIBs to alter the traffic paths set by routing configuration. Care must be taken in deployments to use the appropriate security and operational control to make use of the tools the I2RS RIB and I2RS FB-RIB provide.

8. References

8.1. Normative References:

[I-D.hares-i2rs-pkt-eca-data-model] Hares, S., Wu, Q. and R. White, "Filter-Based Packet Forwarding ECA Policy", Internet-Draft draft-hares-i2rs-pkt-eca-data-model-02, February 2016.
[I-D.ietf-i2rs-architecture] Atlas, A., Halpern, J., Hares, S., Ward, D. and T. Nadeau, "An Architecture for the Interface to the Routing System", Internet-Draft draft-ietf-i2rs-architecture-15, April 2016.
[I-D.ietf-i2rs-rib-data-model] Wang, L., Ananthakrishnan, H., Chen, M., amit.dass@ericsson.com, a., Kini, S. and N. Bahadur, "A YANG Data Model for Routing Information Base (RIB)", Internet-Draft draft-ietf-i2rs-rib-data-model-05, March 2016.
[I-D.ietf-i2rs-rib-info-model] Bahadur, N., Kini, S. and J. Medved, "Routing Information Base Info Model", Internet-Draft draft-ietf-i2rs-rib-info-model-08, October 2015.
[I-D.ietf-netmod-acl-model] Bogdanovic, D., Koushik, K., Huang, L. and D. Blair, "Network Access Control List (ACL) YANG Data Model", Internet-Draft draft-ietf-netmod-acl-model-07, March 2016.
[I-D.ietf-netmod-routing-cfg] Lhotka, L. and A. Lindem, "A YANG Data Model for Routing Management", Internet-Draft draft-ietf-netmod-routing-cfg-21, March 2016.
[I-D.kini-i2rs-fb-rib-info-model] Kini, S., Hares, S., Dunbar, L., Ghanwani, A., Krishnan, R., Bogdanovic, D. and R. White, "Filter-Based RIB Information Model", Internet-Draft draft-kini-i2rs-fb-rib-info-model-03, February 2016.

8.2. Informative References

[I-D.acee-rtgwg-yang-rib-extend] Lindem, A. and Y. Qu, "RIB YANG Data Model", Internet-Draft draft-acee-rtgwg-yang-rib-extend-01, March 2016.
[I-D.ietf-i2rs-usecase-reqs-summary] Hares, S. and M. Chen, "Summary of I2RS Use Case Requirements", Internet-Draft draft-ietf-i2rs-usecase-reqs-summary-02, March 2016.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997.

Authors' Addresses

Susan Hares Huawei 7453 Hickory Hill Saline, MI 48176 USA EMail: shares@ndzh.com
Sriganesh Kini Ericsson EMail: sriganesh.kini@ericsson.com
Linda Dunbar Huawei USA EMail: linda.dunbar@huawei.com
Ram Krishnan Dell EMail: Ramkri123@gmail.com
Dean Bogdanovic Juniper Networks Westford, MA, EMail: ivandean@gmail.org
Russ White Linkedin EMail: russ@riw.us