Monitoring and Analyzing Switch Operation

Traffic Mirroring

C o n f i g u r a t i o n N o t e s

Using the CLI, you can configure all mirroring options on a switch.

Using the Menu or Web interface, you can configure session 1 local mirroring for traffic in both directions on specified interfaces. (If session 1 has been already configured in the CLI for local mirroring for inbound-only or outbound -only traffic and you use the Menu or Web interface to modify the session 1 configuration, session 1 is automatically reconfigured to monitor both inbound and outbound traffic on the assigned interfaces. If session 1 has been configured in the CLI with a classifier-based mirroring policy, an error message is displayed if you try to use the Menu or Web interface to configure the session.)

You can use the CLI to configure sessions 1 to 4 for local mirroring in any combination, and override a Menu or Web interface-based configuration of session 1.

You can also use SNMP to configure sessions 1 to 4 for local mirroring in any combination, and override a Menu or Web interface-based configuration of session 1, except that SNMP cannot be used to configure a classifier-based mirroring policy.

Endpoint Switches and Intermediate Devices

The following restrictions apply to endpoint switches and intermediate devices in a network configured for traffic mirroring:

■The exit port for a mirroring destination must be an individual port, and not a trunk, mesh or VLAN interface.

■The switch mirrors traffic on static trunks, but not on dynamic LACP trunks.

■The switch mirrors traffic at line rate. When mirroring multiple interfaces in networks with high traffic levels, it is possible to copy more traffic to a mirroring destination than the link supports. In this case, some mirrored traffic may not reach the destination. If you are mirroring a high traffic volume, distribute the load to multiple exit ports if possible.

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