Cisco MDS 9000 Series Configuration Manual page 50

Port Monitor
Note • The err-pkt-from-port_ASIC Error Pkt from Port, err-pkt-to-xbar_ ASIC Error Pkt to xbar, and
err-pkt-from-xbar_ASIC Error Pkt from xbar counters were introduced in Cisco NX-OS Release 5.2(2a)
and are not supported on one rack unit and two rack unit switches.
• We recommend that you use the delta threshold type for all the counters except the tx-slowport-oper-delay
counter which uses absolute threshold type.
• The rx-datarate and tx-datarate are calculated using the inoctets and outoctets on an interface.
• The unit for threshold values (rising and falling) differs across different counters.
• tx-slowport-oper-delay wait is applicable only for advanced 16-Gbps and 32-Gbps modules and switches.
• You must configure slow-port monitoring using the system timeout slowport-monitor command in
order to get alerts for tx-slowport-count and tx-slowport-oper-delay for a particular port type. (See the
system timeout slowport-monitor command in the
• Absolute counters do not support port-guard action. However, tx-slowport-oper-delay counter supports
Congestion Isolation port-guard action.
• txwait is applicable only for advanced 16-Gbps and 32-Gbps modules and switches. In the default
configuration, the port monitor sends an alert if the transmit credit is not available for 400 ms (40%) in
1 second.
txwait sends alerts when there are multiple slow-port events that have not hit the slow-port monitor
threshold, but have together hit the txwait threshold configured. For example, if there are 40 discrete
10-ms intervals of 0 TX credits in 1 second, tx-slowport-oper-delay does not find these credits; txwait
finds the credits and sends an alert.
• The state-change counter records the port down-to-port up action as one state change that is similar to
flap. This is the reason the state-change counter does not have the portguard action set as flap.
• When the portguard action is set as flap, you will get alerts only through syslog.
• Only the credit-loss-reco, tx-credit-not-available, tx-slowport-oper-delay, and txwait counters use the
cong-isolate keywords to detect slow flow on a device. For more information, see
Monitor Policy, on page
The following counters were added from Cisco MDS NX-OS Release 5.2(2a) that are not included in the
default policy:
Note
• Crossbar (Xbar) counters are supported only on the Cisco MDS 9700 48-Port 16-Gbps Fibre Channel
Switching Module (DS-X9448-768K9), Cisco MDS 9700 48-Port 32-Gbps Fibre Channel Switching
Module (DS-X9648-1536K9), and Cisco MDS 9000 24/10-Port SAN Extension Module (DS-X9334-K9).
• Crossbar counters do not work as expected when check interval is configured.
• Crossbar counters work only when the poll-interval is set to 300 seconds.
• err-pkt-from-port_ASIC Error Pkt from port
Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
32
53.
Cisco MDS 9000 Series Command
Configuring Interfaces
Reference.)
Configuring a Port