Cisco Systems DSC9148D8G48PK9 manual Port Monitor Port Guard, Port Group Monitor, Local Switching

Chapter 2 Configuring Interfaces

Information About Interfaces

	Threshold	Interval	% Rising		% Falling
Counter	Type	(Seconds)	Threshold	Event	Threshold	Event
RX Performance	Delta	60	2147483648	4	524288000	4
TX Performance	Delta	60	2147483648	4	524288000	4

Port Monitor Port Guard

Port monitor port guard is a feature that disables or shuts down a port when an event occurs. Depending on the configuration, when an event occurs the port is either error-disabled or flapped.

Port monitor port guard is a different or separate feature that functions based on the configuration of the errordisable command.

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

Local Switching

Local switching can be enabled in Generation 4 modules, which allows traffic to be switched directly with a local crossbar when the traffic is directed from one port to another on the same line card. By using local switching, an extra switching step is avoided, which decreases the latency.

When using local switching, note the following guidelines:

•All ports need to be in shared mode, which usually is the default state. To place a port in shared mode, enter the switchport ratemode shared command.

•E ports are not allowed in the module because they must be in dedicated mode.

Note Local Switching is not supported on MDS 9710.

	Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
2-16	OL-29284-01, Release 6.x