Internet DRAFT - draft-chan-lsr-igp-adv-offset
draft-chan-lsr-igp-adv-offset
LSR Working Group Louis Chan
INTERNET-DRAFT Krzysztof Szarkowicz
Intended status: Standard Track Juniper Networks
Expires: Sep 9, 2023 Mar 10, 2023
IGP extensions for Advertising Offset for Flex-Algorithm
draft-chan-lsr-igp-adv-offset-02.txt
Abstract
This document describes the IGP extensions to provide predictable Adjacency-SIDs
per Flex-Algorithm [FLEXALGO] in segment routing.
We propose some methods to allow the advertisement of additional TLV in IGP so that
the Flex-Algorithm specific Adjacency-SIDs could be automatically derived.
With the proposed method, the size of advertisement on per node per link basis is
greatly reduced. Each participating router would derive the required labels
automatically.
Extensions for offset to derive Flex-Algorithm Prefix-SID is also included in the
document.
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/.
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 "work in progress."
This Internet-Draft will expire on Sep 9, 2023.
Copyright Notice
Copyright (c) 2023 IETF Trust and the persons identified as the document authors.
All rights reserved.
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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 ............................................... 2
2. Conventions used in this document .......................... 2
3. Virtual Flex-Algorithm ..................................... 3
4. ISIS extension ............................................. 3
4.1. Algorithm Offset for Adj-SID .......................... 3
4.2. Algorithm Offset for LAN based Adj-SID ................ 4
4.3. Algorithm Offset for Prefix SID ....................... 5
5. Compatibility .............................................. 7
6. OSPF extension ............................................. 8
6.1. Algorithm Offset for Adj-SID .......................... 8
6.2. Algorithm Offset for LAN based Adj-SID ................ 9
6.3. Algorithm Offset for Prefix SID ...................... 10
7. Security Consideration .................................... 11
8. References ................................................ 11
8.1. Normative References ................................. 11
8.2. Informative References ............................... 12
9. Acknowledgments ........................................... 12
1. Introduction
The draft proposes methods for routers to announce Flex-Algorithm specific
Adjacency-SID with minimal advertisement in IGP. When the other routers need a SR
policy (aka SR-TE) or TI-LFA path, the Flex-Algorithm specific Adjacency-SID would
be taken into the path label construction.
Hence, the top most label, either node or link related, in a SR policy stack would
be used to identify a certain Flex-Algo with full identification.
In the same draft, Virtual Flex-Algorithm concept is introduced.
2. Conventions used in this document
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].
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
significance described in RFC 2119.
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3. Virtual Flex-Algorithm
Here in this draft, Virtual Flex-Alogrithm (VFA) is introduced. There could be
additional virtual topology which would like to share the same Flex-Algo topology
with same metrics and constraints, and VFA would need different Prefix-SID and Adj-
SID for identification in the forwarding plane.
It would save resource to recalculate the shared topology for different VFA.
The relationship between VFA and its related Flex-Algorithm could be similar to
VLAN and port. Or, they could be in parallel relationship.
VFA would be represented in 32 bits with the minimum value of 256.
4. ISIS extension
With reference to RFC8667, the information could be advertised in SR-Capabilities
sub-TLV in Section 3.
4.1. Algorithm Offset for Adj-SID
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 | Algorithm |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Virtual Flex-Algorithm |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SID/Label | Base offset/Index offset (variable) ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Flags/ Algo/ VFA/ Base offset/ Index offset ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where:
Type: TDB
Length: variable; multiple advertisements
Flags: 1 octet field of the following flags:
0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+
| |B|V|L| |
+-+-+-+-+-+-+-+-+
where:
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B-Flag: Backup Flag. If set, the Adj-SID is eligible
for protection (e.g., using IP Fast Reroute
(IPFRR) or MPLS Fast Reroute (MPLS-FRR)) as
described in [RFC8402].
V-Flag: Value Flag. If set, then it carries
a label value. If not set, it is an index value.
L-Flag: Local Flag. Always set to 1
Algorithm: 1 octet
Flex-Algo value is between 128 and 255.
Virtual Flex-Algorithm 4 octets
Value 0 means that it is not VFA
Value >=256 means VFA identification number, and the base
topology is denoted by Algorithm
Value 128 to 255 are invalid
Base Offset: 3 octets
Local label base for Adjacency-SIDs for given Flex-
Algorithm. The derived Adjacency-SID is the sum of the base
offset and the Algo 0 label
Index Offset: 4 octets
If Adjacency-SID is advertised as index, this provides an
offset index value. The new label is sum of (SRGB base +
index + index offset)
The format of Base Offset and Index Offset is the same as RFC8667. The choice of
advertising Base Offset or Index Offset must match the advertisement of original
Adjacency-SID method from the same router.
4.2. Algorithm Offset for LAN based Adj-SID
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 | Algorithm |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Virtual Flex-Algorithm |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Neighbor System-ID (ID length octets) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SID/Label Base Offset/Index Offset (variable) ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Flags/ Algo/VFA/NB Sys-ID/ SID/Label/Index Offset (variable) ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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where:
Type: TDB
Length: variable; multiple advertisements
Flags: 1 octet field of the following flags:
0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+
| |B|V|L| |
+-+-+-+-+-+-+-+-+
where:
B-Flag: Backup Flag. If set, the Adj-SID is eligible
for protection (e.g., using IP Fast Reroute
(IPFRR) or MPLS Fast Reroute (MPLS-FRR)) as
described in [RFC8402].
V-Flag: Value Flag. If set, then it carries
a label value. If not set, it is an index value.
L-Flag: Local Flag. Always set to 1
Algorithm: 1 octet. Same as Section 4.1
Virtual Flex-Algorithm 4 octets. Same as Section 4.1
Neighbor System-ID: IS-IS System-ID of length "ID Length" as
defined in [ISO10589].
Base Offset: 3 octets. Same as Section 4.1
Index Offset: 4 octets. Same as Section 4.1
4.3. Algorithm Offset for Prefix SID
Prefix-SID for Algorithm could also be generated by adding an index offset value or
a base offset for label.
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This advertisement is an sub-TLV in RFC8667 Section 2.
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 | Algorithm |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Virtual Flex-Algorithm |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SID/Label Base offset/ Index offset ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Flags/ Algorithm/ VFA/ Base Offset/ Index offset ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type: TDB
Length: variable
Flags: 1 octet field of the following flags:
0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+
|R|N| |V|L| |
+-+-+-+-+-+-+-+-+
where:
R-Flag: Re-advertisement Flag. If set, then the prefix
to which this Prefix-SID is attached has been
propagated by the router from either another
level (i.e., from Level-1 to Level-2 or the
opposite) or redistribution (e.g., from another
protocol).
N-Flag: Node-SID Flag. If set, then the Prefix-SID
refers to the router identified by the prefix.
Typically, the N-Flag is set on Prefix-SIDs that
are attached to a router loopback address. The
N-Flag is set when the Prefix-SID is a Node-SID
as described in [RFC8402].
V-Flag: Value Flag. If set, then it carries
a label value. If not set, it is an index value.
L-Flag: Local Flag. Always set to 0
Algorithm: 1 octet
Flex-Algo value is between 128 and 255
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Virtual Flex-Algorithm 4 octets
Value 0 means that it is not VFA
Value >=256 means VFA identification number, and the base
topology is denoted by Algorithm
Value 128 to 255 are invalid
Base offset: 3 octets
Label base for Prefix-SIDs for given Algorithm
The derived Prefix-SID is the sum of the base
Offset and the Algo 0 label
Index Offset: 4 octets
Index offset counting from Algo 0
The new label for Prefix is sum of (SRGB base +
index + index offset)
The format of Base offset and Index Offset is the same as RFC8667. The choice of
advertising Base Offset or Index Offset MUST match the advertisement of original
Prefix-SID method from the same router.
5. Compatibility
For nodes that do not support Algorithm Offset for Adj-SID extension, the label
stack could use normal Adj-SID, providing that the node still support Flex-Algo
Prefix SID.
For TI-LFA, there would be two modes of operation - loose or strict. For strict
mode, all Adj-SID involved in TI-LFA candidate path must be derived with offset
method.
For loose mode, Adj-SID in the TI-LFA candidate path could be a mix of Adj-SID's
with and without offset. This allows backward compatibility with routers which only
support Flex-Algo.
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6. OSPF extension
The following TLVs are advertised in the Router Information Opaque LSA (defined in
[RFC7770]). these TLVs are applicable to both OSPFv2 and OSPFv3.
6.1. Algorithm Offset for Adj-SID
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 | Reserved | MT-ID | Weight |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Algorithm |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Virtual Flex-Algorithm |
+---------------------------------------------------------------+
| SID/Label Offset/Index Offset (variable) ~
+---------------------------------------------------------------+
~ Flags/R/MT-ID/Algo/Weight/SID/Label/Index Offset(variable) ~
+---------------------------------------------------------------+
where:
Type: TBD
Length: Variable
Flags: Single-octet field containing the following flags:
0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+
|B|V|L| |
+-+-+-+-+-+-+-+-+
where:
B-Flag: Backup Flag. If set, the Adj-SID is eligible
for protection (e.g., using IP Fast Reroute
(IPFRR) or MPLS Fast Reroute (MPLS-FRR)) as
described in [RFC8402].
V-Flag: Value Flag. If set, then it carries
a label value. If not set, it is an index value.
L-Flag: Local Flag. Always set to 1
Other bits: Reserved. These MUST be zero when sent and are
ignored when received.
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MT-ID: Multi-Topology ID (as defined in [RFC4915]
Weight: Weight used for load-balancing purposes. The use of the
weight is defined in [RFC8402].
Algorithm: 1 octets
Flex-Algo value is between 128 and 255.
Virtual Flex-Algorithm: 4 octets
Value 0 means that it is not VFA
Value >=256 means VFA identification number, and the base
topology is denoted by Algorithm
Value 128 to 255 are invalid
Base Offset: 3 octets
Local label base for Adjacency-SIDs for given Flex-
Algorithm. The derived Adjacency-SID is the sum of the base
offset and the Algo 0 label
Index Offset: 4 octets
If Adjacency-SID is advertised as index, this provides an
offset index value. The new label is sum of (SRGB base +
index + index offset)
The format of Base Offset and Index Offset is the same as RFC8665 or RFC8666. The
choice of advertising Base Offset or Index Offset must match the advertisement of
original Adjacency-SID method from the same router.
6.2. Algorithm Offset for LAN based Adj-SID
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 | Reserved | MT-ID | Weight |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Algorithm |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Virtual Flex-Algorithm |
+---------------------------------------------------------------+
| Neighbor ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SID/Label Offset/Index Offset (variable) ~
+---------------------------------------------------------------+
~ Flags/R/MT-ID/Weight/Algo/NHR ID/S/Lab/Index Offset(variable) ~
+---------------------------------------------------------------+
where:
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Type: TBD
Length: Variable
Flags: Same as 6.1
Reserved: Same as 6.1
MT-ID: Same as 6.1
Weight: Same as 6.1
Algorithm: Same as 6.1
Virtual Flex-Algorithm: Same as 6.1
Neighbor ID: The Router ID of the neighbor for which the LAN
Adjacency SID is advertised
Base offset: Same as 6.1
Index Offset: Same as 6.1
6.3. Algorithm Offset for Prefix SID
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 | Reserved | MT-ID | Algorithm |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Virtual Flex-Algorithm |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SID/Index Offset/Label Offset(variable) ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Flags/R/MT-ID/Algo/SID/Index/Label Offset(variable) ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where:
Type: TDB
Length: Variable
Flags: Single-octet field. The following flags are defined:
0 1 2 3 4 5 6 7
+--+--+--+--+--+--+--+--+
| | | |E |V |L | | |
+--+--+--+--+--+--+--+--+
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E-Flag: Explicit Null Flag. If set, any upstream neighbor
of the Prefix-SID originator MUST replace the Prefix-SID
with the Explicit NULL label (0 for IPv4) before
forwarding the packet.
V-Flag: Value Flag. If set, then it carries
a label value. If not set, it is an index value.
L-Flag: Local Flag. Always set to 0
Other bits: Reserved. These MUST be zero when sent and are
ignored when received.
MT-ID: Multi-Topology ID (as defined in [RFC4915])
Algorithm: 1 octet
Flex-Algo value is between 128 and 255
Virtual Flex-Algorithm: 4 octets
Value 0 means that it is not VFA
Value >=256 means VFA identification number, and the base
topology is denoted by Algorithm
Value 128 to 255 are invalid
Base offset: 3 octets
Label base for Prefix-SIDs for given Algorithm
The derived Prefix-SID is the sum of the base
Offset and the Algo 0 label
Index Offset: 4 octets
Index offset counting from Algo 0
The new label for Prefix is sum of (SRGB base +
index + index offset)
The format of Base offset and Index Offset is the same as RFC8665 or RFC8666. The
choice of advertising Base Offset or Index Offset MUST match the advertisement of
original Prefix-SID method from the same router.
7. Security Consideration
TBD
8. References
8.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels",
BCP 14, RFC 2119, March 1997.
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8.2. Informative References
[RFC8665] Psenak, P., Ed., Previdi, S., Ed., Filfils, C., Gredler,
H., Shakir, R., Henderickx, W., and J. Tantsura, "OSPF
Extensions for Segment Routing", RFC 8665,
DOI 10.17487/RFC8665, December 2019,
<https://www.rfc-editor.org/info/rfc8665>.
[RFC8666] Psenak, P., Ed. and S. Previdi, Ed., "OSPFv3 Extensions
for Segment Routing", RFC 8666, DOI 10.17487/RFC8666,
December 2019, <https://www.rfc-editor.org/info/rfc8666>
[RFC8667] Previdi, S., Ed., Ginsberg, L., Ed., Filsfils, C.,
Bashandy, A., Gredler, H., and B. Decraene, "IS-IS
Extensions for Segment Routing", RFC 8667,
DOI 10.17487/RFC8667, December 2019,
<https://www.rfc-editor.org/info/rfc8667>.
[TI-LFA] Litkowski, S., Bashandy, A., Filsfils, C., Francois, P.,
Decraene, B., and D. Voyer, "Topology Independent Fast
Reroute using Segment Routing",
<https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-segment-
routing-ti-lfa>
[FLEXAGLO] S. Hegde, P. Psenak and etc, IGP Flexible Algorithm
https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo
[ISO10589] International Organization for Standardization,
"Information technology -- Telecommunications and
information exchange between systems -- Intermediate
system to Intermediate system intra-domain routeing
information exchange protocol for use in conjunction with
the protocol for providing the connectionless-mode network
service (ISO 8473)", ISO/IEC 10589:2002, Second Edition,
November 2002.
9. Acknowledgments
The following people have contributed to this document:
Shraddha Hegde, Juniper Networks
Authors' Address
Louis Chan (Editor)
Juniper Networks Group (Hong Kong) Limited
Suites 3001-7
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30th Floor Tower 2
Times Square
1 Matheson Street
Causeway Bay
Hong Kong
Phone: +852-38562100
Email: louisc@juniper.net
Krzysztof Grzegorz Szarkowicz
Juniper Networks
Parkring 10
A-1010 Wien
Austria
Phone: +49 89 203012127
Email: kszarkowicz@juniper.net
Chan Expires Sep 9, 2023 [Page 13]
