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Port switch is flapping, Cluster Members have similar MAC addresses Technical Level
Symptoms
  • A port switch is flapping in a Cluster XL configuration.

  • In the same network segment, different cluster members have similar MAC addresses. Example - 02:00:00:00:00:00 and 02:00:00:00:00:01

Cause

Cluster Members with the fixed source MAC address 02:00:00:00:00:mem_id are forwarding cluster correction packets.

When you run more then one cluster in the same segment (sk25977), port flapping can occur because two different Cluster Members have the same correction MAC address.

For example:
02:00:00:00:00:00 - The correction packets from member 1 (on both clusters)
02:00:00:00:00:01 - The correction packets from member 2 (on both clusters)


Solution
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