[c-nsp] 7500 having problems after upgrade from 12.0.19S2 to 12.0.31S1

[Rodney Dunn]

Isolating memory leaks is pretty simple if there is one.

reboot box
If low memory is there after convergence most likely not a leak
and you don't have enough memory.

If you have a lot free (we recommend 20+M for full bgp feeds to
handle transient memory during reconvergence) then you start to
monitor 'sh proc mem' over time. If it keeps gonig down for free
you isolate the process that keeps increasing in the Holding column
and collect "sh proc mem <PID>" for that process and open a case with
TAC.

Rodney

On Tue, Nov 22, 2005 at 02:02:05PM +0100, CLAEREBOUDT Elke wrote:
> This router was used for the peering at BNIX. We did shutdown the
> ethernetinterface, so it has for the moment
> 3 ibgp neighbours (full bgp table)
> 1 ebgp neighbour (full bgp table)
> 1 ebgp neighbour (2 prefixes)
> 
> 171815 network entries using 20274170 bytes of memory
> 858523 path entries using 44643196 bytes of memory
> 158768/31630 BGP path/bestpath attribute entries using 20957376 bytes of
> memory
> 28498 BGP AS-PATH entries using 738336 bytes of memory
> 533 BGP community entries using 41518 bytes of memory
> 1 BGP extended community entries using 24 bytes of memory
> 0 BGP route-map cache entries using 0 bytes of memory
> 0 BGP filter-list cache entries using 0 bytes of memory
> BGP using 86654620 total bytes of memory
> 
> The router ran fine for 2 years on 12.0.19S2.
> We don't have exact stats on the memory usage with the old version.
> I'm a bit worried because our other router is running low on memory also
> 
> Downgrade seems the most easy solution
> 
> Regards
> elke
> -----Original Message-----
> From: Jon Lewis [mailto:jlewis at lewis.org] 
> Sent: Tuesday 22 November 2005 13:49
> To: CLAEREBOUDT Elke
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] 7500 having problems after upgrade from 12.0.19S2
> to 12.0.31S1
> 
> On Tue, 22 Nov 2005, CLAEREBOUDT Elke wrote:
> 
> > We've upgraded a 7500 from 12.0.19S2 to 12.0.31S1 , RSP has 256K of
> > memory. After 10 days router started to misbehave and we had to
> isolate
> > it from the network. Cisco case opened gave us the answer, you need
> 512M
> > on a rsp when it has more then 100K routes (has 170K). Cpu is very
> > unstable and points to snmp engine.
> 
> What was your free mem under 12.0.19S2?  Assuming it was considerably 
> more, I'd say there's bugs/memory leaks in the new IOS.  I've got
> several 
> RSP4's with full BGP routes and 40-50mb free, all running 12.2(18)S.
> 
> ----------------------------------------------------------------------
>   Jon Lewis                   |  I route
>   Senior Network Engineer     |  therefore you are
>   Atlantic Net                |
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