All things related to multicast

[Dino Farinacci <>]

>> The idea is straightforward, but ingenious; configure an RP at a special 
>> address within your IPv6 space, one that can then be encoded into a few 
>> bits that become part of the group address. It builds on RFC 3306 
>> "Unicast-Prefix-based IPv6 Multicast Addresses". It lets you generate 
>> globally unique group addresses, and avoid flooding source information (so 
>> no more MSDP) or having to discover sources out of band (SSM).

    Please note, sources are still discovered. They are done so at the network
    layer by using PIM-ASM. That is, via the PIM shared-tree.

>> The only implementation I now of is in IOS, you can find the versions with 
>> Feature Navigator. I have a router that's running it but haven't lashed up 
>> a test yet. . .

    You could use Embed-RP group addresses today in any ASM capable router
    by staticly configuring the RP address for a group range that is the 
    Embed-RP group range. Just an FYI.

    One problem with "dyanmic" Emberd-RP being used in ASM mode, is that 
    anyone can choose a group address which can select any router in the
    PIM domain to be the RP. This might be counter to what the netadmin would
    want.

    So following this through, then you would have to install filters 
    everywhere. So you may as well install static "ipv6 pim rp-address" 
    commands instead.

Dino