Internet-Draft draft-ietf-lsr-ospf-ls-link-infinity-25.txt is now available.
It is a work item of the Link State Routing (LSR) WG of the IETF.
Title: Advertising Unreachable Links in OSPF
Authors: Liyan Gong
Weiqiang Cheng
Changwang Lin
Acee Lindem
Ran Chen
Name: draft-ietf-lsr-ospf-ls-link-infinity-25.txt
Pages: 28
Dates: 2026-03-14
Abstract:
OSPF Router Link State Advertisements (LSAs) use fixed-format
encodings that always include advertised links in the default SPF
(Shortest Path First) computation. For non-default SPF computations,
e.g., flexible algorithms as described in RFC 9350, advertised OSPF
links are used in the default SPF computation even if this is not
intended. In order to advertise these links and not use them in the
base SPF calculation, the metric LSLinkInfinity (0xffff) is used to
specify that the link is unreachable. If all OSPF routers in an OSPF
area support this functionality and have advertised the capability
via an area-scoped OSPF Router-Information LSA, then links advertised
with a metric of LSLinkInfinity are considered unreachable.
MaxReachableLinkMetric (0xfffe) is defined to provide backward
compatible reachability in specifications that previously specified
advertisement of MaxLinkMetric (0xffff). This document updates RFC
5443, RFC 6987, RFC 8379, and RFC 8770 with respect to the
advertisement of MaxReachableLinkMetric (0xfffe) rather than
MaxLinkMetric (0xffff).
The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsr-ospf-ls-link-infinity/
There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-ietf-lsr-ospf-ls-link-infinity-25.html
A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-ietf-lsr-ospf-ls-link-infinity-25
Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts
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