Cisco MDS 9000 Series Configuration Manual page 206

Configuration Examples for Congestion Isolation
switch# configure terminal
switch(config)# feature congestion-isolation
Flap the ISLs to activate ER_RDY mode on E ports. Use the CLI show flow-control r_rdy to
list the ports that are still in R_RDY mode
This example shows how to disable Congestion Isolation:
switch# configure terminal
switch(config)# no feature congestion-isolation
Flap the ISLs to activate ER_RDY mode on E ports.Use the CLI show flow-control r_rdy to
list the ports that are still in R_RDY mode
This example shows how to manually configure a device as a slow device. The configured device will be
permanently treated as a slow device until it is removed from congestion isolation using the no
congestion-isolation include pwwn pwwn vsan vsan-id command. All traffic to this device traversing the
device's ISLs that are in ER_RDY flow-control mode will be routed to the low-priority VL (VL2).
switch# configure terminal
switch(config)# congestion-isolation include pwwn 10:00:00:00:c9:f9:16:8d vsan 4
This example shows how to configure a device that is to be excluded from automatic congestion isolation by
the port monitor. Even when the rising threshold of a port-monitor counter is reached and the portguard action
is set to cong-isolate, this device will not be isolated as a slow device, and traffic to this device traversing the
device's ISLs that are in ER_RDY flow-control mode will not be routed to the low-priority VL (VL2).
switch# configure terminal
switch(config)# congestion-isolation exclude pwwn 10:00:00:00:c9:f9:16:8d vsan 4
Slow devices can be identified either via the port monitor, or manually included or excluded using the
congestion-isolation {include | exclude} pwwn pwwn vsan vsan-id command. On removing the exclude
configuration, if the device is detected as slow by the port monitor, the device will again be marked as slow.
Also, if the exclude configuration is already used for a device marked as slow by the port monitor, the device
will no longer behave as a slow device.
This example shows how to manually remove an interface from being detected as slow in the port monitor:
1. Identifying the interface that you want to remove from being detected as slow.
switch# show congestion-isolation ifindex-list
======================
Ifindex: 1088000(fc2/9)
fc2/9 marked slow
2. Identifying the host that is using the interface.
switch# show congestion-isolation pmon-list
PMON detected list for vsan 1
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PMON detected list for vsan 2
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Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
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Congestion Detection, Avoidance, and Isolation
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