Why do network bridges fail to forward multicast traffic?

Solution Verified - Updated -

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?

Environment

  • 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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