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Status Not under consideration
Workspace PowerHA for AIX
Created by Guest
Created on Mar 1, 2017

HA 7.1 MultiCast Functionality

HA 7.1 multi cast functionality is not working correctly... Request to send to the switch on first attempt to sync the cluster... After a reboot of the nodes the cluster cannot sync because a new request is not send to the cluster... The cluster expects the switch to remember which is not possible as the switch have a timeout value... Need PowerHA to send request to the switch so the switch could be aware of Multi Cast...
This is not an option on the switch as other lpars are on the same vlan...

1) IGMP snooping: ON

2) IGMP querier: ON


Idea priority High
  • Guest
    Sep 23, 2020

    Only the very early version (2010-2011) of CAA used multicast, now all the deployments of CAA uses socket (TCP/IP) for communication by default. This mode of communication is called UNICAST. Hence, everything should work seamlessly across multiple subnets, as the routing is handled by TCP/IP stack.

    Only in very rare occasions, when there is no incoming packets on an interface, CAA would issue a multicast ping to generate some incoming packet to check the health of the adapter. This should also work by default. Customer can easily test this on any of their nodes even without configuring PowerHA, by simply running the command,

    ping -I

    This multicast group is turned on on all AIX machines and these don't need to go across network to a remote CAA node. This is just an ARP message, All the neighboring AIX machines will respond to this thereby generating incoming packets. In short, no special handling is needed if customer is using UNICAST mode