[c-nsp] BGP router process using way more memory on one system

[Drew Weaver]

I'll leave this here incase it helps anyone but I was able to get it to respond to a few simple validation commands by just clearing a BGP session.

Thanks,
-Drew

-----Original Message-----
From: Nick Hilliard <nick at foobar.org> 
Sent: Monday, May 25, 2020 3:51 AM
To: Drew Weaver <drew.weaver at thenap.com>
Cc: 'cisco-nsp at puck.nether.net' <cisco-nsp at puck.nether.net>
Subject: Re: [c-nsp] BGP router process using way more memory on one system

Drew Weaver wrote on 24/05/2020 19:20:
> We have two routers that have a mirrored configuration. Peers, BGP 
> configuration, everything. Exactly the same [except for IP addresses]
> 
> One of the routers BGP router process is holding 617576024. The other 
> is holding 577596716.
> 
> The one that is holding more appears to be suffering from an out of 
> memory condition.

There were a couple of releases where the ipv4_rib process had a persistent memory leak.  Try this:

Router# admin process restart ipv4_rib

This is non service affecting - restarting the process temporarily stops FIB reprogramming, then does a full RIB reload from all RIB sources, then does a FIB check across the device. I.e. it's safer to do this than to hobble along with OOM errors.

Nick