Port Monitor Check Interval; Port Group Monitor - Cisco MDS 9000 Series Configuration Manual

Configuring Interfaces

Port Monitor Check Interval

Check interval polls for values more frequently within a poll interval so that the errors are detected much
earlier and appropriate action can be taken.
With the existing poll interval, it is not possible to detect errors at an early stage. Users have to wait till the
completion of the poll interval to detect the errors.
By default, the check interval functionality is not enabled.
Note • The port monitor check interval feature is supported only on the Cisco MDS 9710 Multilayer Director,
• Check interval is supported on both counters, absolute and delta.
• We recommend that you configure the poll interval as a multiple of the check interval.
• When a port comes up, the check interval will not provide an alert regarding invalid words for the port

Port Group Monitor

Note Port Group Monitor functionality only applies to modules that support oversubscription.
The ports on a line card are divided into fixed groups called port groups that share a link of fixed bandwidth
to the backplane. Since the total port bandwidth can exceed the backplane link bandwidth, frames will be
queued, introducing traffic delays. The Port Group Monitor functionality can be used to monitor this
oversubscription in both the transmit and receive directions to allow ports to be rebalanced between port
groups before the delays become unacceptable.
When the Port Group Monitor feature is enabled and when a policy consisting of polling interval in seconds
and the rising and falling thresholds in percentage are specified, the port group monitor generates a syslog if
port group traffic goes above the specified percentage of the maximum supported bandwidth for that port
group (for receive and for transmit). Another syslog is generated if the value falls below the specified threshold.
Table shows the threshold values for the default Port Group Monitor policy:
Table 11: Default Port Group Monitor Policy Threshold Values
Counter
RX
Datarate
TX
Datarate
Cisco MDS 9718 Multilayer Directors, and Cisco MDS 9706 Multilayer Directors.
until the poll interval expires. We recommend that you bring up a set of ports at a given time in the
module instead of all the ports.
Threshold Interval
Type (Seconds)
Delta 60
Delta 60
% Rising
Threshold
80
80
Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
Port Monitor Check Interval
% Falling Threshold
20
20
35