draft-ietf-ospf-segment-routing-msd-04.txt   draft-ietf-ospf-segment-routing-msd-05.txt 
OSPF Working Group J. Tantsura OSPF Working Group J. Tantsura
Internet-Draft Individual Internet-Draft Individual
Intended status: Standards Track U. Chunduri Intended status: Standards Track U. Chunduri
Expires: September 29, 2017 Huawei Technologies Expires: December 6, 2017 Huawei Technologies
S. Aldrin S. Aldrin
Google, Inc Google, Inc
P. Psenak P. Psenak
Cisco Systems Cisco Systems
March 28, 2017 June 04, 2017
Signaling MSD (Maximum SID Depth) using OSPF Signaling MSD (Maximum SID Depth) using OSPF
draft-ietf-ospf-segment-routing-msd-04 draft-ietf-ospf-segment-routing-msd-05
Abstract Abstract
This document proposes a way to signal Maximum SID Depth (MSD) This document proposes a way to signal Maximum SID Depth (MSD)
supported by a node at node and/or link granularity by an OSPF supported by a node at node and/or link granularity by an OSPF
Router. In a Segment Routing (SR) enabled network a centralized Router. In a Segment Routing (SR) enabled network a centralized
controller that programs SR tunnels needs to know the MSD supported controller that programs SR tunnels needs to know the MSD supported
by the head-end at node and/or link granularity to push the SID stack by the head-end at node and/or link granularity to push the SID stack
of an appropriate depth. MSD is relevant to the head-end of a SR of an appropriate depth. MSD is relevant to the head-end of a SR
tunnel or Binding-SID anchor node where Binding-SID expansions might tunnel or Binding-SID anchor node where Binding-SID expansions might
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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 http://datatracker.ietf.org/drafts/current/. Drafts is at http://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 September 29, 2017. This Internet-Draft will expire on December 6, 2017.
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
(http://trustee.ietf.org/license-info) in effect on the date of (http://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
skipping to change at page 3, line 18 skipping to change at page 3, line 18
[I-D.ietf-ospf-mpls-elc] defines Readable Label Depth Capability [I-D.ietf-ospf-mpls-elc] defines Readable Label Depth Capability
(RLDC) that is used by a head-end to insert Entropy Label (EL) at (RLDC) that is used by a head-end to insert Entropy Label (EL) at
appropriate depth, so it could be read by transit nodes. MSD in appropriate depth, so it could be read by transit nodes. MSD in
contrary signals ability to push SID's stack of a particular depth. contrary signals ability to push SID's stack of a particular depth.
MSD of type 1 (IANA Registry), called Base MSD is used to signal the MSD of type 1 (IANA Registry), called Base MSD is used to signal the
total number of SIDs a node is capable of imposing, to be used by a total number of SIDs a node is capable of imposing, to be used by a
path computation element/controller. In case, there are additional path computation element/controller. In case, there are additional
labels (e.g. service) that are to be pushed to the stack - this would labels (e.g. service) that are to be pushed to the stack - this would
be signaled with an another MSD type (TBD), MSD SHOULD be adjusted to be signaled with an another MSD type (TBD), no adjustment to the Base
reflect that. In the future, new MSD types could be defined to MSD should be made. In the future, new MSD types could be defined to
signal additional capabilities: entropy labels, labels that can be signal additional capabilities: entropy labels, labels that can be
pushed thru recirculation, or another dataplane e.g IPv6. pushed thru recirculation, or another dataplane e.g IPv6.
1.1. Conventions used in this document 1.1. Conventions used in this document
1.1.1. Terminology 1.1.1. Terminology
BGP-LS: Distribution of Link-State and TE Information using Border BGP-LS: Distribution of Link-State and TE Information using Border
Gateway Protocol Gateway Protocol
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10.2. Informative References 10.2. Informative References
[I-D.ietf-ospf-mpls-elc] [I-D.ietf-ospf-mpls-elc]
Xu, X., Kini, S., Sivabalan, S., Filsfils, C., and S. Xu, X., Kini, S., Sivabalan, S., Filsfils, C., and S.
Litkowski, "Signaling Entropy Label Capability Using Litkowski, "Signaling Entropy Label Capability Using
OSPF", draft-ietf-ospf-mpls-elc-04 (work in progress), OSPF", draft-ietf-ospf-mpls-elc-04 (work in progress),
November 2016. November 2016.
[I-D.ietf-ospf-ospfv3-lsa-extend] [I-D.ietf-ospf-ospfv3-lsa-extend]
Lindem, A., Mirtorabi, S., Roy, A., and F. Baker, "OSPFv3 Lindem, A., Roy, A., Goethals, D., Vallem, V., and F.
LSA Extendibility", draft-ietf-ospf-ospfv3-lsa-extend-13 Baker, "OSPFv3 LSA Extendibility", draft-ietf-ospf-ospfv3-
(work in progress), October 2016. lsa-extend-14 (work in progress), April 2017.
[I-D.ietf-pce-segment-routing] [I-D.ietf-pce-segment-routing]
Sivabalan, S., Medved, J., Filsfils, C., Crabbe, E., Sivabalan, S., Filsfils, C., Tantsura, J., Henderickx, W.,
Raszuk, R., Lopez, V., Tantsura, J., Henderickx, W., and and J. Hardwick, "PCEP Extensions for Segment Routing",
J. Hardwick, "PCEP Extensions for Segment Routing", draft- draft-ietf-pce-segment-routing-09 (work in progress),
ietf-pce-segment-routing-08 (work in progress), October April 2017.
2016.
[I-D.tantsura-idr-bgp-ls-segment-routing-msd] [I-D.tantsura-idr-bgp-ls-segment-routing-msd]
Tantsura, J., Chunduri, U., Mirsky, G., and S. Sivabalan, Tantsura, J., Chunduri, U., Mirsky, G., and S. Sivabalan,
"Signaling Maximum SID Depth using Border Gateway Protocol "Signaling Maximum SID Depth using Border Gateway Protocol
Link-State", draft-tantsura-idr-bgp-ls-segment-routing- Link-State", draft-tantsura-idr-bgp-ls-segment-routing-
msd-03 (work in progress), March 2017. msd-04 (work in progress), March 2017.
[RFC5838] Lindem, A., Ed., Mirtorabi, S., Roy, A., Barnes, M., and [RFC5838] Lindem, A., Ed., Mirtorabi, S., Roy, A., Barnes, M., and
R. Aggarwal, "Support of Address Families in OSPFv3", R. Aggarwal, "Support of Address Families in OSPFv3",
RFC 5838, DOI 10.17487/RFC5838, April 2010, RFC 5838, DOI 10.17487/RFC5838, April 2010,
<http://www.rfc-editor.org/info/rfc5838>. <http://www.rfc-editor.org/info/rfc5838>.
[RFC7684] Psenak, P., Gredler, H., Shakir, R., Henderickx, W., [RFC7684] Psenak, P., Gredler, H., Shakir, R., Henderickx, W.,
Tantsura, J., and A. Lindem, "OSPFv2 Prefix/Link Attribute Tantsura, J., and A. Lindem, "OSPFv2 Prefix/Link Attribute
Advertisement", RFC 7684, DOI 10.17487/RFC7684, November Advertisement", RFC 7684, DOI 10.17487/RFC7684, November
2015, <http://www.rfc-editor.org/info/rfc7684>. 2015, <http://www.rfc-editor.org/info/rfc7684>.
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