[c-nsp] Log messages saying %MCAST-SP-3-QUERY_INT_MISMATCH

[Jeroen van Ingen]

On Fri, 2011-10-07 at 12:19 +0100, Phil Mayers wrote:
> On 10/07/2011 12:11 PM, Phil Mayers wrote:
> 
> > Having now identified the source IP, it's coming from our switch
> > management networks. Our edge switches are Extreme x450, which do run
> > Linux. I guess they're electing themselves IGMPv1 querier because they
> > have a lower IP address.
> 
> >> Are the boxes you're seeing this on acting as queriers, or are they just
> >> doing IGMP snooping?
> >
> > They ought to be the queriers, and certainly believe they are.
> 
> Oops, no, I'm wrong.
> 
> In fact, multicast isn't enabled AT ALL on our switch management 
> networks; they are in a VRF which doesn't have multicast routing 
> enabled, and:
> 
> #sh ip igmp vrf DEVMAN interface vlXXXX
> % Multicast not enabled for vrf DEVMAN
> 
> ...which makes it DOUBLY irritating that the log messages are appearing; 
> the 6500 is *not* the IGMP querier, so it should just shut up about 
> whatever *is* the querier, and the interval it elects.

Hmm, I see what you mean... what if you enabled multicast routing for
vrf DEVMAN and then disable IGMP snooping on the interface? Perhaps that
will silence the messages. I assume that some form of IGMP snooping is
now active even though mcast routing isn't enabled in the VRF.


Regards,

Jeroen van Ingen
ICT Service Centre
University of Twente, P.O.Box 217, 7500 AE Enschede, The Netherlands