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Monitoring and Analyzing Switch Operation
Traffic Mirroring
To manage packets that do not match the match or ignore criteria in any
class in the policy, and therefore have no mirroring actions performed on
them, you can enter an optional default class. The default class is placed
at the end of a policy configuration and specifies the mirroring actions to
perform on packets that are neither matched nor ignored.
4. (Optional) To configure a default-class in a policy, enter the default-class
command at the end of a policy configuration and specify one or more
actions to be executed on packets that are not matched and not ignored.
Context: Policy configuration
Syntax: [no] default-class action mirror <session > [action mirror <session > ...]
Configures a default class that allows packets that are not
matched nor ignored by any of the class configurations in a
mirroring policy to be mirrored to the destination
configured for the specified session.
Prerequisite: The local or remote exit port for a session must
already be configured with a destination device before you
enter the mirror < session > parameter in a default-class action
statement. See “2. Configure a Mirroring Destination on a
Remote Switch” on page B-50 and “3. Configure a Mirroring
Session on the Source Switch” on page B-52 for more
information.
For general information about how to configure and manage a service
policy, refer to the “Creating a Service Policy” section in the “Classifier-
Based Software Configuration” chapter in the Advanced Traffic Manage-
ment Guide.
5. Apply the mirroring policy to inbound traffic on a port (interface service-
policy in command) or VLAN (vlan service-policy in command) interface.
Caution After you apply a mirroring policy for one or more preconfigured sessions on
a port or VLAN interface, the switch immediately starts to use the traffic-
selection criteria and exit port to mirror traffic to the destination device
connected to each exit port.
In a remote mirroring session which uses IPv4 encapsulation, if the remote
switch is not already configured as the destination for the session, its perfor-
mance may be adversely affected by the stream of mirrored traffic.
B-71