[c-nsp] BFD and EoMPLS

[Robert Crowe (rocrowe)]

1. Tune your IGP to your desired level of convergence (SPF timers, etc).
2. Use BFD with your IGP
3. Use LDP IGP-Sync or LDP Session Protection.

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Michael Robson
Sent: Wednesday, December 22, 2010 5:09 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] BFD and EoMPLS

I have a test network of three Cisco 6500(Sup720s) running SXI5
connected together in a triangle. Each is iBGPed to the others using
loopbacks advertised around this testbed using OSPF and Label switching
is also turned on. I then have two clients connected one to router A and
the second to router B with an EoMPLS pseudowire connecting them (the
pseudowire is terminated against the same loopback of the 6500s used for
the BGP peerings). If I then get the clients to continuously ping each
other and break the link directly connecting routers A and B, there is
loss of connectivity for about 6 or 7 seconds before the pseudowire
re-routes via router C. If I configure BFD for each link and also attach
it to OSPF and repeat the experiment, the time to re-route is still 6-7
seconds.

I can reason that this might work or that it shouldn't: does this not
work because there is no direct hook between BFD and LDP or should it
work because the pseudowire terminating loopbacks are advertised in
OSPF, OSPF has been hooked into BFD and ultimately the LFIB is built via
the FIB and LIB (or perhaps with this testbed because the size of the
network and Penultimate Hop Popping it means that the FIB is used
anyway)?

Ta,

Michael.
-- 

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