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Although CCP mode is set to Broadcast, Delta Sync packets are sent over Sync interface(s) as multicast
Symptoms
  • Although CCP mode is set to Broadcast, Delta Sync packets are sent over Sync interface(s) as multicast.

    Example of traffic capture:

    23:59:07.048746 00:00:00:00:fe:01 > 01:00:5e:07:07:fa, ethertype IPv4 (0x0800), length 82: 0.0.0.0.cp-cluster > 7.7.7.0.cp-cluster: UDP, length 40
    23:59:07.048805 00:00:00:00:fe:01 > 01:00:5e:07:07:fa, ethertype IPv4 (0x0800), length 82: 0.0.0.0.cp-cluster > 7.7.7.0.cp-cluster: UDP, length 40
    23:59:07.120890 00:00:00:00:88:00 > 01:00:5e:07:07:fa, ethertype IPv4 (0x0800), length 76: 0.0.0.0.cp-cluster > 7.7.7.0.cp-cluster: UDP, length 34
  • Connections initiated from the Standby member (e.g., SSH, FTP) in ClusterXL High Availability might time out when the value of kernel parameter "fwha_sync_broadcast_ack" is set to "1" per sk20576 (at least on the Active member).

  • SSH connection fails (times out) in the following topology:
    Host --> (int)[Active](ext) --> [switch] --> (ext)[Standby]

    Traffic capture and cluster debug ('fw ctl debug -m cluster + forward') show that the SSH packet reaches the Active member and forwarded to the Standby over the Sync network (as designed).
    However, Standby does not respond to this SSH connection.
Cause

By the current design, setting CCP mode to Broadcast is not applied to Sync interfaces.


Solution
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