Multicast/Broadcast Cluster state after HFA04

[crucial]

I just successfully completed my first Hotfix upgrade on our production cluster. Although traffic is flowing and things appear to be normal, I have a question regarding the cphaprob state command.

According to my topology, 192.168.32.44 and .45 are the sync interfaces. 192.168.16.44 and .45 are actually one of the DMZ interfaces.

I have 'funny' results depending on if I use multicast or broadcast.

fw-ep1:

[Expert@fw-ep1]# cphaconf set_ccp broadcast
[Expert@fw-ep1]# cphaprob state

Cluster Mode: New High Availability (Primary Up)

Number Unique Address Assigned Load State

1 (local) 192.168.32.44 100% active
2 192.168.16.45 0% standby

fw-ep2:

[Expert@fw-ep2]# cphaconf set_ccp broadcast
[Expert@fw-ep2]# cphaprob state

Cluster Mode: New High Availability (Primary Up)

Number Unique Address Assigned Load State

1 192.168.16.44 100% active
2 (local) 192.168.32.45 0% standby

Also, if I set cphaconf set_ccp multicast, then i get different results:
fw-ep1:

[Expert@fw-ep1]# cphaconf set_ccp multicast
[Expert@fw-ep1]# cphaprob state

Cluster Mode: New High Availability (Primary Up)

Number Unique Address Assigned Load State

1 (local) 192.168.16.44 0% down
2 192.168.16.45 100% active attention

fw-ep2:

[Expert@fw-ep2]# cphaconf set_ccp multicast
[Expert@fw-ep2]# cphaprob state

Cluster Mode: New High Availability (Primary Up)

Number Unique Address Assigned Load State

1 192.168.16.44 0% down
2 (local) 192.168.16.45 100% active attention

Can anyone shed some light on what could be causing this?

[dbedit]

Are your clustermembers connected trough switches? Its very much possible they do not accept multicast. Try to disable IGMP snooping on your switch ports while running in multicast mode.

[crucial]

Unfortunately I don't have the ability to change the switch configuration at this time. For now I am happy using broadcast mode for the cluster sync, but I am still curious as to why it wants to use different interfaces for broadcast or multicast mode?

Thanks for the help