B-28
Monitoring and Analyzing Switch Operation
Traffic Mirroring
Configuration
Notes
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 out-
bound-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.
