BGP-LS Advertisement of IGP Traffic Engineering Performance Metric Extensions
draft-ietf-idr-te-pm-bgp-09

Abstract

This document defines new BGP-LS TLVs in order to carry the IGP Traffic Engineering Extensions defined in IS-IS and OSPF protocols.

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 RFC 2119.

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.

Status of This Memo

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

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This Internet-Draft will expire on August 17, 2018.

Copyright Notice

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Table of Contents

• 1. Introduction
• 2. Link Attribute TLVs for TE Metric Extensions
• 3. TLV Details
• 3.1. Unidirectional Link Delay TLV
• 3.2. Min/Max Unidirectional Link Delay TLV
• 3.3. Unidirectional Delay Variation TLV
• 3.4. Unidirectional Link Loss TLV
• 3.5. Unidirectional Residual Bandwidth TLV
• 3.6. Unidirectional Available Bandwidth TLV
• 3.7. Unidirectional Utilized Bandwidth TLV
• 4. Security Considerations
• 5. IANA Considerations
• 6. Acknowledgements
• 7. References
• 7.1. Normative References
• 7.2. Informative References
• Authors' Addresses

1. Introduction

BGP-LS ([RFC7752]) defines NLRI and attributes in order to carry link-state information. New BGP-LS Link-Attribute TLVs are required in order to carry the Traffic Engineering Metric Extensions defined in [RFC7810] and [RFC7471].

2. Link Attribute TLVs for TE Metric Extensions

The following new Link Attribute TLVs are defined:

   TLV Name
------------------------------------------
 Unidirectional Link Delay

 Min/Max Unidirectional Link Delay

 Unidirectional Delay Variation

 Unidirectional Packet Loss
 
 Unidirectional Residual Bandwidth

 Unidirectional Available Bandwidth

 Unidirectional Bandwidth Utilization

3. TLV Details

3.1. Unidirectional Link Delay TLV

This TLV advertises the average link delay between two directly connected IGP link-state neighbors. The semantic of the TLV is described in [RFC7810] and [RFC7471].

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|   Type                      |           Length                |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A|  RESERVED   |                   Delay                       |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

where:

Figure 1

Type: 1114

Length: 4.

3.2. Min/Max Unidirectional Link Delay TLV

This sub-TLV advertises the minimum and maximum delay values between two directly connected IGP link-state neighbors. The semantic of the TLV is described in [RFC7810] and [RFC7471].

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|   Type                      |           Length                |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A| RESERVED    |                   Min Delay                   |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|   RESERVED    |                   Max Delay                   |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

where:

Figure 2

Type: 1115

Length: 8.

3.3. Unidirectional Delay Variation TLV

This sub-TLV advertises the average link delay variation between two directly connected IGP link-state neighbors. The semantic of the TLV is described in [RFC7810] and [RFC7471].

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|   Type                      |           Length                |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|  RESERVED     |               Delay Variation                 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

where:

Figure 3

Type: 1116

Length: 4.

3.4. Unidirectional Link Loss TLV

This sub-TLV advertises the loss (as a packet percentage) between two directly connected IGP link-state neighbors. The semantic of the TLV is described in [RFC7810] and [RFC7471].

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|   Type                      |           Length                |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A|  RESERVED   |                  Link Loss                    |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

where:

Type:1117

Length: 4.

3.5. Unidirectional Residual Bandwidth TLV

This sub-TLV advertises the residual bandwidth between two directly connected IGP link-state neighbors. The semantic of the TLV is described in [RFC7810] and [RFC7471].

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|   Type                      |           Length                |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                          Residual Bandwidth                   |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

where:

Type: 1118

Length: 4.

3.6. Unidirectional Available Bandwidth TLV

This sub-TLV advertises the available bandwidth between two directly connected IGP link-state neighbors. The semantic of the TLV is described in [RFC7810] and [RFC7471].

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|   Type                      |           Length                |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                      Available Bandwidth                      |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

where:

Figure 4

Type: 1119

Length: 4.

3.7. Unidirectional Utilized Bandwidth TLV

This sub-TLV advertises the bandwidth utilization between two directly connected IGP link-state neighbors. The semantic of the TLV is described in [RFC7810] and [RFC7471].

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|   Type                      |           Length                |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                     Utilized Bandwidth                        |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

where:

Figure 5

Type: 1120

Length: 4.

4. Security Considerations

Procedures and protocol extensions defined in this document do not affect the BGP security model. See the 'Security Considerations' section of [RFC4271] for a discussion of BGP security. Also refer to [RFC4272] and [RFC6952] for analysis of security issues for BGP.

The TLVs introduced in this document are used to propagate IGP defined information ([RFC7810] and [RFC7471].) These TLVs represent the state and resources availability of the IGP link. The IGP instances originating these TLVs are assumed to have all the required security and authentication mechanism (as described in [RFC7810] and [RFC7471]) in order to prevent any security issue when propagating the TLVs into BGP-LS.

5. IANA Considerations

 TLV code-point                 Value
--------------------------------------------------------
 1114              Unidirectional Link Delay

 1115              Min/Max Unidirectional Link Delay

 1116              Unidirectional Delay Variation

 1117              Unidirectional Packet Loss
 
 1118              Unidirectional Residual Bandwidth

 1119              Unidirectional Available Bandwidth

 1120              Unidirectional Bandwidth Utilization

This document requests assigning code-points from the registry "BGP-LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Attribute TLVs" for the new Link Attribute TLVs defined in the table below:

6. Acknowledgements

The authors wish to acknowledge comments from Ketan Talaulikar.

7. References

7.1. Normative References

7.2. Informative References

Authors' Addresses