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

Matthew Melbourne matt at melbourne.org.uk
Fri Feb 19 04:08:34 EST 2010


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 12.2(18)SXF7.



Matthew Melbourne

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