A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Refresh Interval Independent FRR Facility Protection
Authors : Chandra Ramachandran
Ina Minei
Dante Pacella
Tarek Saad
Filename : draft-chandra-mpls-ri-rsvp-frr-04.txt
Pages : 24
Date : 2016-05-07
Abstract:
RSVP-TE relies on periodic refresh of RSVP messages to synchronize
and maintain the LSP related states along the reserved path. In the
absence of refresh messages, the LSP related states are
automatically deleted. Reliance on periodic refreshes and refresh
timeouts are problematic from the scalability point of view. The
number of RSVP-TE LSPs that a router needs to maintain has been
growing in service provider networks and the implementations should
be capable of handling increase in LSP scale.
RFC 2961 specifies mechanisms to eliminate the reliance on periodic
refresh and refresh timeout of RSVP messages, and enables a router
to increase the message refresh interval to values much larger than
the default 30 seconds defined in RFC 2205. However, the protocol
extensions defined in RFC 4090 for supporting fast reroute (FRR)
using bypass tunnels implicitly rely on short refresh timeouts to
cleanup stale states.
In order to eliminate the reliance on refresh timeouts, the routers
should unambiguously determine when a particular LSP state should be
deleted. Coupling LSP state with the corresponding RSVP-TE signaling
adjacencies as recommended in RSVP-TE Scaling Recommendations
(draft-ietf-teas-rsvp-te-scaling-rec) will apply in scenarios other
than RFC 4090 FRR using bypass tunnels. In scenarios involving RFC
4090 FRR using bypass tunnels, additional explicit tear down
messages are necessary. Refresh-interval Independent RSVP FRR (RI-
RSVP-FRR) extensions specified in this document consists of
procedures to enable LSP state cleanup that are essential in
scenarios not covered by procedures defined in RSVP-TE Scaling
Recommendations.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-chandra-mpls-ri-rsvp-frr/
There's also a htmlized version available at:
https://tools.ietf.org/html/draft-chandra-mpls-ri-rsvp-frr-04
A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-chandra-mpls-ri-rsvp-frr-04
Please note that it may take a couple of minutes from the time of submission
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