Cisco Cisco MDS 9000 NX-OS Software Release 5.2

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Symptom: MDS fabric switch running in NPV mode fails to generate port-monitor alerts.

Condition: Applies to all MDS fabric switches running in NPV mode using port-monitor.

Applies to all versions prior to NX-OS 6.2(13).

Will occur only in the following conditions:

- After one or more upstream NP or TNP ports goes down and then back up. 

- For each (T)NP port that flaps, one F port at the end of the range of ports

will no longer be scanned for port-monitor counter events. For example, if the

(T)NP port fc1/1 flaps then the last F port being used(ex. fc1/48) will no 

longer be scanned for port-monitor counter events.

Workaround: There are two workarounds, one temporary and one permanent:

1 - Contact the TAC and they can assist with killing the port-monitor process. Once the port-monitor 
process restarts, all ports will be once again scanned.

This is only temporary in the sense that if an upstream (T)NP port flaps again the problem will recur.

2 - Move the (T)NP ports to the end of the ports on the switch. For example, if there are four (T)NP 
uplinks on a MDS 9148 or MDS 9148S, then move them to fc1/45-fc1/48. Once this has been done 
the problem will not recur.

The documentation set for Cisco NX-OS for the Cisco MDS 9000 Family includes the following 
documents. 

To find a document online, access the following web site:

The documentation set for Cisco Fabric Manager appears in the Cisco Fabric Manager Release Notes 
for Release 4.2(1), which is available from the following website: