Symptoms
NetScaler 9400 series units running on release 7.0 build 56 and deployed in a High Availability (HA) pair report a Media Access Control (MAC) address conflict.
Note: The primary and secondary nodes may failover and report errors that are similar to the following:
1033:Channel 1/2 has been muted (conflict MAC 00:12:44:15:eb:fc)
1033:Channel 1/1 has been muted (conflict MAC 00:12:44:15:eb:fc)
1031:Channel 1/2 has been unmuted now
1031:Channel 1/1 has been unmuted now
Topology
The relevant topology for this case is shown below:
Cause
Both interfaces (interface 1/1 and interface 1/2) on both the primary and secondary nodes are connected to the same switch without a virtual Local Area Network (VLAN).
Note: NetScaler does not support Spanning-tree protocol (STP).
Resolution
Remove one of the two interfaces.
-Or-
Create a VLAN for connecting more than one interface to the same switch. You must configure the VLAN on both the switch and the NetScaler.
