[c-nsp] Interface flaps affecting BGP and IS-IS

Michel Renfer michel.renfer at finecom.ch
Fri Feb 19 05:07:17 EST 2010

Hi Matt

We same similar issues with 7604, SXF7 and iBGP flaps due to flapping
eBGP sessions. We're still searching for a solution
and are also interested for other comments on this...


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Matthew
Sent: Friday, February 19, 2010 10:09 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Interface flaps affecting BGP and IS-IS


We have a an edge router which connects to our upstream transit
provider over a 10Gbps interface. Recently, on a couple of occasions,
this interface has flapped resulting in BGP processes consuming ~100%
CPU (we are receiving a full table over this peering). Consequently,
when the CPU is pegged at ~100% we begin to lose IS-IS adjacencies. Is
there any way of mitigating against this kind of cause and effect
during periods of link instability - obviously the real fix is to get
the carrier to provide a stable link :-)

The 10G link terminates on a WS-X6704-10GE in a 7606, running



Matthew Melbourne
cisco-nsp mailing list  cisco-nsp at puck.nether.net
archive at http://puck.nether.net/pipermail/cisco-nsp/

More information about the cisco-nsp mailing list