IPv6 Multicast Notes
IPv6 Multicast
– IGMP is now -> Multicast Listen Discovery (MLD)
-> IGMPv1 -> no longer supported
-> IGMPv2 -> MLDv1
-> IGMPv3 -> MLDv2
ip igmp … -> ipv6 mld …
ipv6 multicast-routing
– Activates PIM-SM on all interfaces
– Only PIMv2 is supported with sparse mode
– There is no dense mode in IPv6
To disable PIM-SM on an interface
int fa0/0
no ipv6 pim
Configuring RP
– Manual
ipv6 pim rp-address <ipv6 add> [<acl>]
– Dynamic
-> BSR
-> Embedded RP
Configuring BSR
On RP
ipv6 pim bsr candidate rp <int> [group-list <acl>]
On BSR
ipv6 pim bsr candidate bsr <int> [hash-mode]
Embedded RP
R1(config)# ipv6 pim rp-address 2001:1:2:3::1
FF7x:0YZZ:<first 4 blocks of RP address>:<last 2 blocks of multicast address>
– x – scope
-> always use 5 (site-local)
-> or E (global)
-> 2 (link-local) is not used
– Y – Last block of RP address
– ZZ – prefix-length of RP in hexidecimal format
FF7E:0140:2001:1:2:3:200:300
RP address network portion has to be 4 blocks, subnet mask /64
For IPv6, SSM reserved range is
-> FF3X::
sh ip pim rp mapping
sh ip pim bsr-router