< draft-ietf-lsr-isis-srv6-extensions-01.txt   draft-ietf-lsr-isis-srv6-extensions-02.txt >
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Intended status: Standards Track Cisco Systems Intended status: Standards Track Cisco Systems
Expires: January 5, 2020 A. Bashandy Expires: January 5, 2020 A. Bashandy
Arrcus Arrcus
B. Decraene B. Decraene
Orange Orange
Z. Hu Z. Hu
Huawei Technologies Huawei Technologies
July 4, 2019 July 4, 2019
IS-IS Extension to Support Segment Routing over IPv6 Dataplane IS-IS Extension to Support Segment Routing over IPv6 Dataplane
draft-ietf-lsr-isis-srv6-extensions-01.txt draft-ietf-lsr-isis-srv6-extensions-02.txt
Abstract Abstract
Segment Routing (SR) allows for a flexible definition of end-to-end Segment Routing (SR) allows for a flexible definition of end-to-end
paths by encoding paths as sequences of topological sub-paths, called paths by encoding paths as sequences of topological sub-paths, called
"segments". Segment routing architecture can be implemented over an "segments". Segment routing architecture can be implemented over an
MPLS data plane as well as an IPv6 data plane. This draft describes MPLS data plane as well as an IPv6 data plane. This draft describes
the IS-IS extensions required to support Segment Routing over an IPv6 the IS-IS extensions required to support Segment Routing over an IPv6
data plane. data plane.
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SRv6 LAN End.X SID Sub-TLV (Section 7.2) SRv6 LAN End.X SID Sub-TLV (Section 7.2)
SRv6 SID Structure Sub-Sub-TLV is used to advertise the length of SRv6 SID Structure Sub-Sub-TLV is used to advertise the length of
each individual part of the SRv6 SID as defined in each individual part of the SRv6 SID as defined in
[I-D.ietf-spring-srv6-network-programming]. It has the following [I-D.ietf-spring-srv6-network-programming]. It has the following
format: format:
0 1 2 3 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 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 | | Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| LB Length | LN Length | Fun. Length | Arg. Length | | LB Length | LN Length | Fun. Length | Arg. Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where: where:
Type: 1 Type: 1
Length: 4 octets. Length: 4 octets.
Flags: 1 octet. No flags are currently defined.
LB Length: 1 octet. SRv6 SID Locator Block length in bits. LB Length: 1 octet. SRv6 SID Locator Block length in bits.
LN Length: 1 octet. SRv6 SID Locator Node length in bits. LN Length: 1 octet. SRv6 SID Locator Node length in bits.
Fun. Length: 1 octet. SRv6 SID Function length in bits. Fun. Length: 1 octet. SRv6 SID Function length in bits.
Arg. Length: 1 octet. SRv6 SID Arguments length in bits. Arg. Length: 1 octet. SRv6 SID Arguments length in bits.
ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once in ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once in
its parent sub-TLV. If it appears more than once in its parent TLV, its parent sub-TLV. If it appears more than once in its parent TLV,
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