[c-nsp] Multicast on a 6500 running ios

[Jeff Tantsura]

Hi Geir,

Yes, unfortunately it is.
If you have got only 2 ports within multicast VLAN - disabling igmp snooping
wouldn't really trouble you.
If there are more ports and you'd like not to broadcast every multicast
packet you could configure static CAM entry like:

mac-address-table static 0100.5exx.xxxx vlan y interface 
gigabitethernet a/b gigabitethernet c/c

When you configure a static entry, enter the disable-snooping keyword to
prevent multicast traffic addressed to the statically configured multicast
MAC address from also being sent to other ports in the same VLAN.

Try to read RFC4541 :) 

Hope this helps,
Jeff

> -----Original Message-----
> From: Jensen Geir (UmoeIKT) [mailto:Geir.Jensen at umoeikt.no]
> Sent: maandag 29 januari 2007 13:46
> To: Jeff Tantsura; cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] Multicast on a 6500 running ios
> 
> Thanks Jeff,
> 
> I believe the "ip igmp snooping querier" requires a VLAN interface with
> an ip address? For this particular vlan,  we want the 6500 to operate at
> layer2.
> 
> Does this imply that the 6500 (running ios) can't use igmp snooping when
> it's being used as a layer2-switch?
> 
> I'll try to disable igmp snooping.
> 
> Geir
> 
> 
> -----Original Message-----
> From: Jeff Tantsura [mailto:jeff.tantsura at sscplus.nl]
> Sent: 29. januar 2007 13:09
> To: Jensen Geir (UmoeIKT); cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] Multicast on a 6500 running ios
> 
> Hi,
> 
> You should either enable igmp snooping querier on this VLAN or disable
> igmp
> snooping.
> 
> 
> To enable the IGMP querier in a VLAN, perform this task:
> Step 1 Switch(config)# interface vlan vlan_ID
> Step 2 Switch(config-if)#ip igmp snooping querier Enable the IGMP
> querier.
> 
> Jeff
> 
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> > bounces at puck.nether.net] On Behalf Of Jensen Geir (UmoeIKT)
> > Sent: maandag 29 januari 2007 12:00
> > To: cisco-nsp at puck.nether.net
> > Subject: [c-nsp] Multicast on a 6500 running ios
> >
> > Hi there,
> >
> >
> >
> > What's required for a 6500 (running ios) to forward multicast traffic
> > when the multicast sender and receivers are on the same vlan? (PIM is
> > not configured because the multicast traffic does not need to be
> routed.
> > )
> >
> >
> >
> > Since IGMP is enabled by default,  I expected this to work out of the
> > box. But it didn't..
> >
> >
> >
> > Thanks, appreciate any responses ;)
> >
> >
> >
> > Geir
> >
> >
> >
> >
> > _______________________________________________
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> 
> 
>