BGP and convergence time

Frank Bulk frnkblk at iname.com
Thu May 13 21:28:13 CDT 2010


What about IP SLA with some EEM?  This link may give you some ideas:
http://blog.ioshints.info/2008/01/ospf-default-route-based-on-ip-sla.html

Frank

-----Original Message-----
From: Jay Nakamura [mailto:zeusdadog at gmail.com] 
Sent: Tuesday, May 11, 2010 1:35 PM
To: NANOG
Subject: BGP and convergence time

So, we have two upstreams, both coming in on Ethernet.  One of our
switch crashed and rebooted itself.  Although we have other paths to
egress out the network, because the router's Ethernet interface didn't
go down, our router's BGP didn't realize the neighbor was down until
default BGP timeout was reached.  Our upstream connectivity was out
for couple minutes.

I am looking for ways to detect neighbor being down faster so traffic
can be re-routed faster.  I can do BFD internally but the issue is how
the upstream is going to detect the outage and stop routing our
traffic to that downed link.  I have asked both of my upstreams and
one said they don't do anything like that, second upstream I am still
waiting on the answer.

My question is, do other carriers do BFD or any other means to detect
the neighbor being down faster than normal BGP will allow?  (Both
upstreams are major telcos [AT&T and Qwest], so I think they are less
flexible than some others.)

Or, has anyone succeeded in getting something done with those two carriers?

Thanks!






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