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Does LSPs signaled through Bypass Tunnel need NHLFEs on transit nodes?
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From: Sachin Kalra <skalra@opnet.com>
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Date: Wed, 21 Nov 2001 15:02:43 -0500
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Cc: mpls@UU.NET
Thanks a lot to all those who replied.
I will read draft-manyfolks-rsvp-fastreroute-00.txt (Rename to
draft-ping-rsvp-fastreroute-00.txt) and will get back to the List if If I
have any more questions.
Happy Thanksgiving.
Sachin Kalra
At 08:50 AM 11/20/01 +0100, Jean Philippe Vasseur wrote:
Hi,
At 19:12 19/11/2001 -0500, Sachin Kalra wrote:
Hi:
I have few questions about "Bypass Tunnels". Any help is
appreciated.
In following figure Primary LSP traverses from
(R1->R2->R3->R4->R5) and Bypass tunnel from
(R2->R6->R7->R8->-R4). Bypass is denoted by double
lines.
[R0]
\
[R1]---------[R2]------------------[R3]-----------------[R4]-----------------[R5]
\\
// \
\\
// \
[R6]======[R7]======[R8]
[R9]
If R4 is using Interface specific Label Space. (i.e. it does not use
Global Label Space). Then we need to signal LSP through "Bypass
Tunnel" path to obtain label assigned out of the label space used by
R4 on the interface terminating the link from R8 (Which will later be
used by R2 for label swapping before stacking the label for Bypass
Tunnel)
In this case my understanding is that once R2 has the "required
label" from R4, then R6, R7, R8 do not need to maintain any state
for the signaled LSP, nor do they need any NHLFEs for that LSP. Because
traffic will be sent through the "Bypass Tunnel".
1. Is this correct?
yes
2. How do we handle this
scenario?
see draft-manyfolks-rsvp-fastreroute-00.txt (very recently
published)
3. Does LSPs signaled through
Bypass Tunnel need NHLFEs on transit nodes?
no.
JP.
Thanks for your time,
Sachin Kalra
===========================================================
Sachin Kalra
Modeling Engineer
OPNET Technologies, Inc.
(240)-497-3000 x2796
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