Cat 3560 - blocking multicast traffic

[jan.klicka]

Hello,

we've Cat 3560 running IP Base image (switching only on L2), with several 802.1q trunks:

- 2 are connected to routers/firewalls

- others are connected to other L2 switches,

- each trunk contains over 40 Vlans

The routers/firewalls are "virtualized" using VRRP. I'l like to limit propagation of VRRP only to 3560, without flooding the information to other L2 switches. I tried to block the traffic (multicast IP address 224.0.0.18, MAC address 0100.5e00.0012) using

switchoport block multicast

or

mac-address-table static 0100.5e00.0012 vlan X interface A,B (A and B interfaces are the routers/firewalls)

but I didn't succeeded. Do you have any idea what to try?

Thanks

[thomas.chen]

The better way is to do that is enable VTP Pruning nad stop these unnecessary VRRP messages. By default VTP pruning will be in disabled state.