[c-nsp] Memory exhaustion causing BGP sessions to randomly fail

[Justin M. Streiner]

On Fri, 9 Feb 2007, Drew Weaver wrote:

> Today we had an issue where one of our interfaces (a 100mbps interface)
> was getting DDOS attacked, the router was trying to push 300Mbps down a
> 100Mbps interface.
>
> During this time, the bgp session with one of our upstream providers
> would:
>
> Feb  9 10:44:28.196 EST: %BGP-5-ADJCHANGE: neighbor x.x.x.x Down BGP
> Notification sent
> Feb  9 10:44:28.196 EST: %BGP-3-NOTIFICATION: sent to neighbor x.x.x.x
> 4/0 (hold time expired) 0 bytes

Was the session in question running over the interface that was getting 
DDOS'd?

If multiple sessions were bouncing, then at first glance I'd guess it was 
a CPU overrun issue of some sort and the bouncing BGP sessions were a side 
effect of this.

jms