Cisco UCS: Which uplink is listening for which VLAN?

While troubleshooting VLAN connectivity on UCS in end-host mode with multiple uplinks, it is be good to know which uplink is the designated receiver (listener for broadcast and multicast) for which VLAN. This will be useful when you have L2 connectivity issues, where 1 or more VLANs are having issues going outside the Fabric Interconnects.

Considering the length of the command to find the designated receivers, I haven’t memorised the command itself, but the which command to find it:

UCS-FI-A(nxos)# which | inc vlandb

(2511) show platform software enm internal info vlandb { all | xlatetbl | id  }

 

After copying the above command, you get this:

UCS-FI-B(nxos)# show platform software enm internal info vlandb id xxx
or

UCS-FI-B(nxos)# show platform software enm internal info vlandb all

vlan_id 1
------------
Designated receiver: Eth1/9
Membership:
Eth1/9  Eth1/10

vlan_id 410
-------------
Designated receiver: Eth1/9
Membership:
Eth1/9  Eth1/10

vlan_id 411
-------------
Designated receiver: Eth1/10
Membership:
Eth1/9  Eth1/10

 

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