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Community Member

Multicast Filtering - Help

Hi,

I'm new to multicasting so please bear with me. I'm employing multicast in a new environment with lot's of vlan's and wan connections. My question is how do I lock down a multicast group to only two of the vlan's?

Here's what I have so far:

conf t

ip multicast-routing.

ip pim rp-address 10.49.100.103

int vlan 80

exit

int vlan 81

exit

What do I need to do to restrict the multicast group 239.255.2.20 to only these two vlans i.e. 80 and 81.

Thanks

Dan

3 REPLIES
Community Member

Re: Multicast Filtering - Help

Hello Dan ,

You can use igmp multicast filtering assuming its a igmp traffic:

sw1#sh run int

09:06:02: %SYS-5-CONFIG_I: Configured from console by consolevlan 80

Building configuration...

Current configuration : 63 bytes

!

interface Vlan80

no ip address

ip igmp access-group 1

end

sw1#sh run int vlan 81

Building configuration...

Current configuration : 63 bytes

!

interface Vlan81

no ip address

ip igmp access-group 1

end

sw1#sh access-lists 1

Standard IP access list 1

10 permit 239.255.2.20

and for rest of the vlan's just create another access-list 2 and deny all multicast traffic by using the same command ip igmp access-group under the vlan interface..

Please feel free to contact me should you need any further assistance.

HTH

Anant

Community Member

Re: Multicast Filtering - Help

Thank you very much for that detailed explanation. I for got to add I will also add the following in the vlan's:

int vlan 80

ip pim sparse-mode

exit

int vlan 81

ip pim sparse-mode

exit

Will this make a difference?

Also can you please write me a short filter example using some sort of restriction to limit the multicast group 239.255.2.20 to only join with the rp-address 10.49.100.103 and not allow any other multicast group to connect to it? It's the first time I'm doing this.

Thanks very much.

Community Member

Re: Multicast Filtering - Help

i also need the ability to control what multicast group uses which RP-address so if you found a way to do so please share

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