[c-nsp] PGM, SPM packets and high CPU utilisation

[Tassos Chatzithomaoglou]

There is a command "ip options ignore", but it's only availably on 12000 routers.


--
Tassos


Ras wrote on 21/2/2008 5:15 μμ:
> We make heavy use of Microsoft's MSMQ libraries to implement our PGM
> messaging bus. Unfortunately this implementation of PGM likes to send
> an awful lot of SPM messages within the PGM streams, each of which
> have the Router Alert IP option set.
> 
> At the moment we're seeing ~10kpps of these packets. Our distribution
> layer (Cat4500, SupV) is melting under the pressure (90%+ CPU) and
> Cisco don't seem to be able to give any clear indication as to whether
> upgrading hardware would help (as these packets all get software
> routed, simply moving to standard 'faster switching hardware' doesn't
> help much).
> 
> Has anyone else run into this problem? If so any ideas on how to
> mitigate or resolve the issue? At the moment we're potentially looking
> at having to move all our PGM speakers into a single gigantic
> world-spanning VLAN to avoid having to route it, but that obviously
> isn't an ideal solution.
> 
> Thanks in advance,
> Ras
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