Hello,

Does anybody has any experience with PowerHA 7.1 and multicast ip address ? Will this be an aditional network, in a different VLAN , which allows multicast traffic ?

hi,

ip multicast is just another layer-3 protocol that will use the layer-2 networks (like vlans) that you've been probably using for decades.

your aix enX interfaces do multicast by default.
check out "netstat -I enX -a"

the 224.0.0.1 is the ip multicast "all-hosts-group"

check out "ping -I <one-IP-youve-got-configured> 224.0.0.1"
every host in your segment that knows multicast will answer (many DUPs I suspect).

CAA below your PowerHA7 will use an additional Multicast address (1 per cluster) on every network between the nodes. You just need to choose a unique one.

in large networks enabling "igmp snooping" on the switches will limit the multicast traffic to the switchports of the hosts actually participating in the specific group.

cheers
Joachim