Configuring Slow Port Monitor For Port Monitor; Monitor - Cisco MDS 9000 Series Configuration Manual

Configuring Slow Port Monitor for Port Monitor

Slow-port monitoring is implemented in the hardware, with the slow-port monitor functionality being slightly
different in each generation of hardware. The 16-Gbps and 32-Gbps modules and switches can detect each
instance of the slow-port monitor threshold being crossed. The slow-port monitor log is updated at 100-ms
intervals. A log for a slow-port event on a 16-Gbps and 32-Gbps module or system increments the exact
number of times the threshold is reached.
Slow port monitor can also generate an alert and syslog message via port monitor.
To configure the slow-port monitor timeout value, perform these steps:
Step 1
Enter configuration mode:
switch# configure terminal
Step 2 Specify the slow-port monitor timeout value:
switch(config)# system timeout slowport-monitor milliseconds logical-type {core | edge}
Valid values for the slow-port monitor timeout are:
• 32-Gbps and 16-Gbps modules or switches—1 to 500 ms in 1-ms increments.
For 32-Gbps modules, trunking (TE, TF, and TNP) ports will use the core timeout value and non-trunking ports
Note
(F, E, and NP) or edge ports will use the edge timeout value.
(Optional) Revert to the default slow-port monitor timeout value (50 ms) for the specified port type:
switch(config)# system timeout slowport-monitor default logical-type {core | edge}
(Optional) Disable the slow-port monitor:
switch(config)# no system timeout slowport-monitor default logical-type {core | edge}
Configuring Slow Port Monitor for Port Monitor
Slow port monitor can be configured in port monitor via the tx-slowport-oper-delay counter. The system
timeout slowport-monitor command also must be configured with a value that is less than or equal to the
tx-slowport-oper-delay rising threshold. The port monitor logical type must also match the system timeout
slowport-monitor logical-type command. Failure to do this results in no port monitor alerts being generated
for tx-slowport-oper-delay.
Configuring the Transmit Average Credit-Not-Available Duration Threshold and Action in Port

Monitor

Cisco MDS monitors its ports that are at zero transmit credits for 100 ms or more. This is called transmit
average credit-not-available duration. The Port Monitor feature can monitor this using the TX Credit Not
Available counter. When the transmit average credit-not-available duration exceeds the threshold set in the
port monitor policy, an SNMP trap with interface details is sent, indicating the transmit average credit not
available duration event along with a syslog message. Additionally, the following events may be configured:
• A warning message is displayed.
• The port can be error disabled.
Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
170
Congestion Detection, Avoidance, and Isolation