Why do network bridges fail to forward multicast traffic?

Solution Verified - Updated 2015-02-08T02:36:10+00:00 -

Issue

Why do network bridges fail to forward multicast traffic in RHEL 5.9, 6.4.z or 6.5?
Why do my RHEL5 cluster VMs take around 4 minutes to form a quorate cluster?
Why does clustered VG created on one node not getting reflected on another node?
In RHEL KVM guest cluster which uses the host bridge for communication, the nodes are unable to properly communicate over multicast.
Why does cluster enters into fencing loop ,when heartbeat interface is on bridge network?
Why clustat shows other node as offline when the heartbeat interface is on bridge network?

Red Hat Enterprise Linux (RHEL) 5.9.
Red Hat Enterprise Linux (RHEL) 6.5 or 6.4.z (2.6.32-358.23.1.el6)
Network bridges.
Multicast traffic.
Red Hat Enterprise Linux Server 6 (with the High Availability and Resilient Storage Add Ons)

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