[j-nsp] Multicast design with PIM-SM

[Chuck Anderson]

On Tue, Feb 14, 2006 at 04:32:34PM +0100, F J wrote:
> When the link between the two routers go down I assume the clients will 
> loose ALL multicast groups since the non-RP router looses contact with the 
> RP. I would like them to still be able to see the groups that belong to the 
> multicast sources connected to the non-RP router...

If the multicast streams have switched over to the Shortest Path Tree, 
then this should not be the case.

> Any suggestions how this could be achieved in an easy way?

Set up both routers as RPs for the same group ranges and enable MSDP 
in a mesh group between them.

msdp {
    rib-group inet mcast-rpf-rib;
    active-source-limit {
        maximum 20000;
        threshold 15000;
    }
    export msdp-import-filter;
    import msdp-import-filter;
    group CORE {
        mode mesh-group;
        local-address my.ip.address;
        peer other.ip.address;
    }
}