Cisco MDS 9000 Series Configuration Manual page 199

Congestion Detection, Avoidance, and Isolation
switch(config-port-monitor)# counter {credit-loss-reco | tx-credit-not-available | tx-slowport-oper-delay | txwait}
poll-interval seconds {absolute | delta} rising-threshold count1 event event-id warning-threshold count2
falling-threshold count3 event event-id portguard cong-isolate
Note Absolute counters do not support portguard actions. However, the tx-slowport-oper-delay absolute counter
supports Congestion Isolation portguard action.
(Optional) Revert to the default values for a counter:
switch(config-port-monitor)# no counter {credit-loss-reco | tx-credit-not-available | tx-slowport-oper-delay | txwait}
poll-interval seconds {absolute | delta} rising-threshold count1 event event-id warning-threshold count2
falling-threshold count3 event event-id portguard cong-isolate
Step 4 Return to configuration mode:
switch(config-port-monitor)# exit
Step 5
Activate the specified port-monitor policy:
switch(config)# port-monitor activate policyname
(Optional) Deactivate the specified port-monitoring policy:
switch(config)# no port-monitor activate policyname
Configuring the Port-Monitor Portguard Action for Congestion Isolation
Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
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