Internet-Draft draft-ietf-lsr-ospf-ls-link-infinity-12.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-12.txt
Pages: 24
Dates: 2025-12-03
Abstract:
In certain scenarios, it is necessary to advertise OSPF links that
are not applicable to the default SPF (Shortest Path First)
calculation for other purposes. 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.
Stub Router Advertisement (RFC 6987) defines MaxLinkMetric (0xffff)
to indicate a router-LSA link should not be used for transit IP
traffic. When an OSPF router supports the Unreachable Link support
capability defined in this document, OSPF Stub Router links are
advertised as MaxReachableLinkMetric (0xfffe) rather than
MaxLinkMetric (0xffff). This document updates RFC 6987 and RFC 8770
with respect to the advertisement of MaxReachableLinkMetric rather
than MaxLinkMetric.
Similarily, Label Distribution Protocol (LDP) IGP Synchronization
(RFC5443) specifies OSPF advertisement of MaxLinkMetric (0xffff) to
indicate that while the OSPF adjacency is in FULL state, LDP has not
been synchronized between the two neighbors and transit traffic is
discouraged. This document updates RFC 5433 with respect to the
advertisement of MaxReachableLinkMetric rather than MaxLinkMetric.
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-12.html
A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-ietf-lsr-ospf-ls-link-infinity-12
Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts
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