draft-ietf-ospf-segment-routing-extensions-22.txt   draft-ietf-ospf-segment-routing-extensions-23.txt 
Open Shortest Path First IGP P. Psenak, Ed. Open Shortest Path First IGP P. Psenak, Ed.
Internet-Draft S. Previdi, Ed. Internet-Draft S. Previdi, Ed.
Intended status: Standards Track C. Filsfils Intended status: Standards Track C. Filsfils
Expires: May 31, 2018 Cisco Systems, Inc. Expires: June 16, 2018 Cisco Systems, Inc.
H. Gredler H. Gredler
RtBrick Inc. RtBrick Inc.
R. Shakir R. Shakir
Google, Inc. Google, Inc.
W. Henderickx W. Henderickx
Nokia Nokia
J. Tantsura J. Tantsura
Individual Individual
November 27, 2017 December 13, 2017
OSPF Extensions for Segment Routing OSPF Extensions for Segment Routing
draft-ietf-ospf-segment-routing-extensions-22 draft-ietf-ospf-segment-routing-extensions-23
Abstract Abstract
Segment Routing (SR) allows a flexible definition of end-to-end paths Segment Routing (SR) allows a flexible definition of end-to-end paths
within IGP topologies by encoding paths as sequences of topological within IGP topologies by encoding paths as sequences of topological
sub-paths, called "segments". These segments are advertised by the sub-paths, called "segments". These segments are advertised by the
link-state routing protocols (IS-IS and OSPF). link-state routing protocols (IS-IS and OSPF).
This draft describes the OSPF extensions required for Segment This draft describes the OSPF extensions required for Segment
Routing. Routing.
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 31, 2018. This Internet-Draft will expire on June 16, 2018.
Copyright Notice Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of (https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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6.1. Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . . . 16 6.1. Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . . . 16
6.2. LAN Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . 18 6.2. LAN Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . 18
7. Elements of Procedure . . . . . . . . . . . . . . . . . . . . 19 7. Elements of Procedure . . . . . . . . . . . . . . . . . . . . 19
7.1. Intra-area Segment routing in OSPFv2 . . . . . . . . . . 19 7.1. Intra-area Segment routing in OSPFv2 . . . . . . . . . . 19
7.2. Inter-area Segment routing in OSPFv2 . . . . . . . . . . 20 7.2. Inter-area Segment routing in OSPFv2 . . . . . . . . . . 20
7.3. Segment Routing for External Prefixes . . . . . . . . . . 21 7.3. Segment Routing for External Prefixes . . . . . . . . . . 21
7.4. Advertisement of Adj-SID . . . . . . . . . . . . . . . . 21 7.4. Advertisement of Adj-SID . . . . . . . . . . . . . . . . 21
7.4.1. Advertisement of Adj-SID on Point-to-Point Links . . 21 7.4.1. Advertisement of Adj-SID on Point-to-Point Links . . 21
7.4.2. Adjacency SID on Broadcast or NBMA Interfaces . . . . 21 7.4.2. Adjacency SID on Broadcast or NBMA Interfaces . . . . 21
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 22 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 22
8.1. OSPF OSPF Router Information (RI) TLVs Registry . . . . . 22 8.1. OSPF Router Information (RI) TLVs Registry . . . . . . . 22
8.2. OSPF Extended Prefix LSA TLV Registry . . . . . . . . . . 22 8.2. OSPFv2 Extended Prefix Opaque LSA TLVs Registry . . . . . 22
8.3. OSPF Extended Prefix LSA Sub-TLV Registry . . . . . . . . 22 8.3. OSPFv2 Extended Prefix TLV Sub-TLVs Registry . . . . . . 22
8.4. OSPF Extended Link LSA Sub-TLV Registry . . . . . . . . . 22 8.4. OSPFv2 Extended Link TLV Sub-TLVs Registry . . . . . . . 22
8.5. IGP Algorithm Type Registry . . . . . . . . . . . . . . . 23 8.5. IGP Algorithm Type Registry . . . . . . . . . . . . . . . 23
9. Implementation Status . . . . . . . . . . . . . . . . . . . . 23 9. Implementation Status . . . . . . . . . . . . . . . . . . . . 23
10. Security Considerations . . . . . . . . . . . . . . . . . . . 25 10. Security Considerations . . . . . . . . . . . . . . . . . . . 25
11. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 25 11. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 25
12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 25 12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 25
13. References . . . . . . . . . . . . . . . . . . . . . . . . . 25 13. References . . . . . . . . . . . . . . . . . . . . . . . . . 25
13.1. Normative References . . . . . . . . . . . . . . . . . . 26 13.1. Normative References . . . . . . . . . . . . . . . . . . 26
13.2. Informative References . . . . . . . . . . . . . . . . . 26 13.2. Informative References . . . . . . . . . . . . . . . . . 26
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 27 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 27
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Label Range TLV advertisement, area-scoped flooding is REQUIRED. Label Range TLV advertisement, area-scoped flooding is REQUIRED.
3.3. SR Local Block TLV 3.3. SR Local Block TLV
The SR Local Block TLV (SRLB TLV) contains the range of labels the The SR Local Block TLV (SRLB TLV) contains the range of labels the
node has reserved for local SIDs. SIDs from the SRLB MAY be used for node has reserved for local SIDs. SIDs from the SRLB MAY be used for
Adjacency-SIDs, but also by components other than the OSPF protocol. Adjacency-SIDs, but also by components other than the OSPF protocol.
As an example, an application or a controller may instruct the router As an example, an application or a controller may instruct the router
to allocate a specific local SID. Some controllers or applications to allocate a specific local SID. Some controllers or applications
may use the control plane to discover the available set of local SIDs may use the control plane to discover the available set of local SIDs
on a particular router. In such cases, the SRLG is advertised in the on a particular router. In such cases, the SRLB is advertised in the
control plane. The requirement to advertise the SRLB is further control plane. The requirement to advertise the SRLB is further
described in [I-D.ietf-spring-segment-routing-mpls]. The SRLB TLV is described in [I-D.ietf-spring-segment-routing-mpls]. The SRLB TLV is
used to advertise the SRLB. used to advertise the SRLB.
The SRLB TLV is a top-level TLV of the Router Information Opaque LSA The SRLB TLV is a top-level TLV of the Router Information Opaque LSA
(defined in [RFC7770]). (defined in [RFC7770]).
The SRLB TLV MAY appear multiple times in the Router Information The SRLB TLV MAY appear multiple times in the Router Information
Opaque LSA and has the following format: Opaque LSA and has the following format:
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using the Adj-SID Sub-TLV as described in Section 6.1. using the Adj-SID Sub-TLV as described in Section 6.1.
SR capable routers MAY also advertise a LAN-Adj-SID for other SR capable routers MAY also advertise a LAN-Adj-SID for other
neighbors (e.g., BDR, DR-OTHER) on the broadcast, NBMA, or hybrid neighbors (e.g., BDR, DR-OTHER) on the broadcast, NBMA, or hybrid
network using the LAN-ADJ-SID Sub-TLV as described in Section 6.2. network using the LAN-ADJ-SID Sub-TLV as described in Section 6.2.
8. IANA Considerations 8. IANA Considerations
This specification updates several existing OSPF registries. This specification updates several existing OSPF registries.
8.1. OSPF OSPF Router Information (RI) TLVs Registry 8.1. OSPF Router Information (RI) TLVs Registry
o 8 (IANA Preallocated) - SR-Algorithm TLV o 8 (IANA Preallocated) - SR-Algorithm TLV
o 9 (IANA Preallocated) - SID/Label Range TLV o 9 (IANA Preallocated) - SID/Label Range TLV
o 14 - SR Local Block TLV o 14 - SR Local Block TLV
o 15 - SRMS Preference TLV o 15 - SRMS Preference TLV
8.2. OSPF Extended Prefix LSA TLV Registry 8.2. OSPFv2 Extended Prefix Opaque LSA TLVs Registry
Following values are allocated: Following values are allocated:
o 2 - OSPF Extended Prefix Range TLV o 2 - OSPF Extended Prefix Range TLV
8.3. OSPF Extended Prefix LSA Sub-TLV Registry 8.3. OSPFv2 Extended Prefix TLV Sub-TLVs Registry
Following values are allocated: Following values are allocated:
o 1 - SID/Label Sub-TLV o 1 - SID/Label Sub-TLV
o 2 - Prefix SID Sub-TLV o 2 - Prefix SID Sub-TLV
8.4. OSPF Extended Link LSA Sub-TLV Registry 8.4. OSPFv2 Extended Link TLV Sub-TLVs Registry
Following initial values are allocated: Following initial values are allocated:
o 1 - SID/Label Sub-TLV o 1 - SID/Label Sub-TLV
o 2 - Adj-SID Sub-TLV o 2 - Adj-SID Sub-TLV
o 3 - LAN Adj-SID/Label Sub-TLV o 3 - LAN Adj-SID/Label Sub-TLV
8.5. IGP Algorithm Type Registry 8.5. IGP Algorithm Type Registry
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