[c-nsp] C3845 not processing IGMP reports

[Rodney Dunn]

On Thu, Jun 28, 2007 at 10:01:37AM +0300, Matti Saarinen wrote:
> "Collins, Richard (SNL US)" <richard.collins.ext at nsn.com> wrote:
> 
> > It might be useful to see additional information such as:
> >
> > c3845#show ip igmp interface gi0/1.180
> >
> > c3845#show ip igmp groups
> 
>  Those commands show no groups relating to gi0/1.180, unfortunately.
> 
>  One thing I forgot to mention is that if I manually configure the
>  router interface to join a group (int gi0/1.180 ... ip igmp join-group
>  x.x.x.x), packets sent to that group are flooded to the whole vlan (as
>  they should because the swtiches there don't do snooping). 

It's best not to use igmp join-group becasue that makes the router
a receiver in the group and forces process switching of all multicast
packets for that group. If you want it to forward out an interface use
the static-group option.

t > 
>  I'm now trying to ask the local people to arrange me a port mirror from
>  the link going to the 3845 and also acces to some other host connected
>  to the same vlan as the one I'm currently looking at is.
> 
>  Cheers,
> 
> -- 
> - Matti -
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