> # Port Group Monitor

> Each line card or module has a predefined set of ports which share the same backplane bandwidth called port groups. While oversubscription is a feature, the port group monitor feature helps to monitor the spine bandwidth utilization. An alarm syslog is generated so that you can provision the ports across port groups evenly to manage the oversubscription better.

> When the port group monitor feature is enabled and a policy consisting of polling interval in seconds, and the raising and falling thresholds in percentage are specified, port group monitor generates a syslog if a port group traffic goes above the specified percentage of the maximum supported bandwidth for that port group (for rx and for tx) and another syslog if the value falls below the specified threshold.

> The default port group policy has the following threshold values:

> Counter | Threshold Type | Interval (Seconds) | % Rising Threshold | % Falling Threshold
> --- | --- | --- | --- | ---
> RX Performance | Delta | 60 | 80 | 20
> TX Performance | Delta | 60 | 80 | 20

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