Cisco MDS 9000 Series Configuration Manual page 189

Congestion Detection, Avoidance, and Isolation
• The port can be flapped.
The Port Monitor feature provides the CLI to configure the thresholds and actions. The threshold configuration
is configured as a percentage of the interval. The thresholds can be 0 to 100 percent in multiples of 10, and
the interval can be 1 second to 1 hour. The default is 10 percent of a 1-second interval and generates a SNMP
trap and syslog message when the transmit-average-credit-not-available duration hits 100 ms.
The following edge port monitor policy is active by default. No port monitor policy is enabled for core ports
by default.
switch# show port-monitor slowdrain
Policy Name
Admin status : Not Active
Oper status
Port type
------------------------------------------------------------------------------------
Counter
------------------------------------------------------------------------------------
Credit Loss Reco
TX Credit Not
Available
The following example shows how to configure a new policy similar to the slowdrain policy with the tx-credit
not available threshold set to 200 ms:
Note The default slowdrain port monitor policy cannot be modified and a new policy needs to be configured.
switch# configure
switch(config)# port-monitor name slowdrain_tx200ms
switch(config-port-monitor)# logical-type edge
switch(config-port-monitor)# no monitor counter all
switch(config-port-monitor)# monitor counter credit-loss-reco
switch(config-port-monitor)# monitor counter tx-credit-not-available
switch(config-port-monitor)# counter tx-credit-not-available poll-interval 1 delta
rising-threshold 20 event 4 falling-threshold 0 event 4
switch(config-port-monitor)# no port-monitor activate slowdrain
switch(config)# port-monitor activate slowdrain_tx200ms
switch(config)# end
switch# show port-monitor active
Policy Name
Admin status : Active
Oper status
Port type
------------------------------------------------------------------------------------------------------------
Counter Threshold
------------------------------------------------------------------------------------------------------------
Credit Loss
Reco
TX Credit
Not Available Delta
Configuring the Transmit Average Credit-Not-Available Duration Threshold and Action in Port Monitor
: slowdrain
: Not Active
: All Access Ports
Threshold Interval Rising
Delta 1
Delta 1
: slowdrain_tx200ms
: Active
: All Edge Ports
Interval
Threshold Threshold Threshold
Delta 1 1 4 0
1
event Falling
Threshold Threshold
1 4
10% 4
Rising event Falling
Portguard
4 Not enabled Not enabled
20% 4 0% 4
Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
event PMON Portguard
0 4 Not enabled
0% 4 Not enabled
event Warning PMON
Not enabled Not enabled
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