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-00.txt
Pages : 7
Date : 2015-03-09
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 behavior 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). This practice allows independent end to end LSP path
data-plane verification for each tunnel instance. 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 dependent on the LSP to do
the update.
Such network churn can be avoided/minimized 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. In
addition, whenever label is reused, the setup time for the new tunnel
instance would be faster because there is no need for the transit
routers along the path of the new LSP to wait for the new LFIB entry
to be added. 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:
http://tools.ietf.org/html/draft-dai-mpls-rsvp-te-mbb-label-reuse-00
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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