Internet DRAFT - draft-chen-idr-bgp-ls-algorithm-related-adj-sid
draft-chen-idr-bgp-ls-algorithm-related-adj-sid
IDR R. Chen
Internet-Draft S. Peng
Intended status: Standards Track ZTE Corporation
Expires: 14 March 2022 P. Psenak
Cisco Systems
10 September 2021
Updates to Algorithm Related Adjacency SID Advertisement in RF9085
draft-chen-idr-bgp-ls-algorithm-related-adj-sid-00
Abstract
This draft updates [RFC9085] to defines extensions to the Border
Gateway Protocol-Link State (BGP-LS) address family in order to carry
algorithm Related Adjacency SID.
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 2
2. BGP-LS Extensions for link Attribute . . . . . . . . . . . . 2
2.1. Adjacency SID per Algorithm TLV . . . . . . . . . . . . . 2
2.2. LAN Adjacency SID per Algorithm TLV . . . . . . . . . . . 3
3. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.1. Normative References . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
[I-D.ietf-lsr-algorithm-related-adjacency-sid] defines the algorithm
identifier can be included as part of an Adjacency-SID advertisement
for SR-MPLS.
[RFC9085] defines extensions to the Border Gateway Protocol-Link
State (BGP-LS) address family in order to carry SR information via
BGP, and an algorithm identifier is included as part of the Prefix-
SID TLV advertisement. This draft updates [RFC9085] and defines
extensions to the Border Gateway Protocol-Link State (BGP-LS) address
family in order to carry algorithm Related Adjacency SID.
1.1. 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 [RFC2119].
2. BGP-LS Extensions for link Attribute
2.1. Adjacency SID per Algorithm TLV
The Adjacency SID per Algorithm TLV is used in order to advertise
information related to an algorithm Related Adjacency SID. This
information is derived from the Adjacency Segment Identifier (Adj-
SID) per Algorithm Sub-TLV of ISIS/OSPFv2/OSPFv3(Section 4 of
[I-D.ietf-lsr-algorithm-related-adjacency-sid]).
The Adjacency SID per Algorithm TLV has the following format:
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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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags | Weight | Algorithm | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SID/Label/Index (variable) //
+---------------------------------------------------------------+
Figure 1
where:
Type: TBD1 (Suggested value to be assigned by IANA)
Length: variable.
Flags: 1-octet value that should be set as:
* IS-IS Adj-SID per Algorithm flags as defined in Section 4.1.1 of
[I-D.ietf-lsr-algorithm-related-adjacency-sid]).
* OSPFv2 Adj-SID per Algorithm Sub-TLV as defined in Section 4.2.1
of [I-D.ietf-lsr-algorithm-related-adjacency-sid]).
* OSPFv3 Adj-SID per Algorithm Sub-TLV as defined in Section 4.3.1
of [I-D.ietf-lsr-algorithm-related-adjacency-sid]).
Weight: 1 octet carrying the weight used for load-balancing purposes.
The use of weight is described in Section 3.4 of [RFC8402].
Algorithm: Refer to ISIS/OSPFv2/OSPFv3 Adj-SID per
Algorithm([I-D.ietf-lsr-algorithm-related-adjacency-sid]).
Reserved: 1-octet that MUST be set to 0 and ignored on receipt.
SID/Label/Index:Refer to ISIS/OSPFv2/OSPFv3 Adj-SID per
Algorithm([I-D.ietf-lsr-algorithm-related-adjacency-sid]).
2.2. LAN Adjacency SID per Algorithm TLV
This information is derived from LAN-Adj-SID per Algorithm Sub-TLV of
ISIS/OSPFv2/OSPFv3(Section 4 of
[I-D.ietf-lsr-algorithm-related-adjacency-sid]).
The LAN Adjacency SID per Algorithm TLV has the following format:
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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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags | Weight | Algorithm | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OSPF Neighbor ID / IS-IS System ID |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SID/Label/Index (variable) //
+---------------------------------------------------------------+
Figure 2
where:
Type: TBD2 (Suggested value to be assigned by IANA)
Length: variable.
Flags: 1-octet value that should be set as:
* IS-IS LAN-Adj-SID per Algorithm flags as defined in Section 4.1.2
of [I-D.ietf-lsr-algorithm-related-adjacency-sid]).
* OSPFv2 LAN-Adj-SID per Algorithm Sub-TLV as defined in
Section 4.2.2 of [I-D.ietf-lsr-algorithm-related-adjacency-sid]).
* OSPFv3 LAN-Adj-SID per Algorithm Sub-TLV as defined in
Section 4.3.2 of [I-D.ietf-lsr-algorithm-related-adjacency-sid]).
Weight: 1 octet carrying the weight used for load-balancing purposes.
The use of weight is described in Section 3.4 of [RFC8402].
Algorithm: Refer to ISIS/OSPFv2/OSPFv3 LAN-Adj-SID per
Algorithm([I-D.ietf-lsr-algorithm-related-adjacency-sid]).
Reserved: 1-octet that MUST be set to 0 and ignored on receipt.
Neighbor ID/IS-IS System ID: Refer to ISIS/OSPFv2/OSPFv3 LAN-Adj-SID
per Algorithm([I-D.ietf-lsr-algorithm-related-adjacency-sid]).
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SID/Label/Index:Refer to ISIS/OSPFv2/OSPFv3 LAN-Adj-SID per
Algorithm([I-D.ietf-lsr-algorithm-related-adjacency-sid]).
3. Acknowledgements
TBD.
4. IANA Considerations
This document makes the following Link Attribute TLVs registry under
the "Border Gateway Protocol-Link State (BGP-LS) Parameter".
+======+===========================================+
| Type | Description |
+======+===========================================+
| TBD1 | Adjacency SID per Algorithm |
+------+-------------------------------------------+
| TBD2 | LAN Adjacency SID per Algorithm |
+------+-------------------------------------------+
Figure 3
5. Security Considerations
Procedures and protocol extensions defined in this document do not
affect the BGP-LS security model. See the "Security
Considerations"section of [RFC9085] for a discussion of SR BGP-LS
security.
6. References
6.1. Normative References
[I-D.ietf-lsr-algorithm-related-adjacency-sid]
Peng, S., "Algorithm Related IGP-Adjacency SID
Advertisement", DOI 10.17487/I-D.ietf-lsr-algorithm-
related-adjacency-sid, I-D. ietf-lsr-algorithm-related-
adjacency-sid, June 2021,
<https://www.ietf.org/archive/id/draft-ietf-lsr-algorithm-
related-adjacency-sid-00.txt>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
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[RFC8402] Filsfils, C., "Key words for use in RFCs to Indicate
Requirement Levels", RFC 8402, DOI 10.17487/RFC8402, July
2018, <https://www.rfc-editor.org/info/rfc8402>.
[RFC9085] Previdi, S., "Border Gateway Protocol - Link State (BGP-
LS) Extensions for Segment Routing", RFC 9085,
DOI 10.17487/RFC9085, August 2021,
<https://www.rfc-editor.org/info/rfc9085>.
Authors' Addresses
Ran Chen
ZTE Corporation
Nanjing
China
Email: chen.ran@zte.com.cn
Shaofu Peng
ZTE Corporation
Nanjing
China
Email: peng.shaofu@zte.com.cn
Peter Psenak
Cisco Systems
Slovakia
Email: ppsenak@cisco.com
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