A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : MPLS RSVP-TE MBB Label Reuse
Authors : Minjie Dai
Ebben Aries
Muhammad Nauman Chaudhry
Filename : draft-dai-mpls-rsvp-te-mbb-label-reuse-01.txt
Pages : 6
Date : 2015-09-09
Abstract:
The concept of "make-before-break (MBB)" while rerouting MPLS RSVP-TE
tunnels is discussed in [RFC3209]. In the procedure that is
outlined, the behaviour of downstream label assignment for the new
LSP (new tunnel instance) is not well defined. As a general
practice, a different label is assigned by each downstream router and
advertised to the upstream router in the RESV message for the new
LSP; this results in a separate end-to-end data-plane path for the
new LSP (with the exception of PHP LSPs or UHP LSP with explicit
label on the last hop). The consequence of this practice is that the
label entry gets added/deleted in the LFIB at every non-ingress
router along the LSP path during MBB. Also, the ingress router would
need to update all the applications using this LSP when switching to
the new tunnel instance, as the new tunnel instance uses different
outgoing label. This in turn may also cause other elements of the
network which are dependant on the LSP to do the update.
Such network churn can be avoided or reduced if the same label can
be re-used (kept intact) wherever it is affecting neither the routing
functionalities nor the data path verification of each instance.
This document proposes a set of procedures to facilitate label reuse
when there is a total or partial path overlap between the two tunnel
instances during MBB.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-dai-mpls-rsvp-te-mbb-label-reuse/
There's also a htmlized version available at:
https://tools.ietf.org/html/draft-dai-mpls-rsvp-te-mbb-label-reuse-01
A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-dai-mpls-rsvp-te-mbb-label-reuse-01
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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