[c-nsp] 3750 HSRP question

[Leif Sawyer]

Tassos Chatzithomaoglou writes:
> If blocking egress multicast doesn't cause any issues in your 
> appliances, you could give "switchport block multicast" a try 
> on their ports.
> 

unfortunately, this command only blocks "unknown" m/c addresses.

HSRP uses a well-known address, and is not subject to this filtering.

I've also looked at vlan access-maps, but as that applies to the
whole vlan, that would break HSRP connectivity to the other switch.