Classifier-Based Mirroring Restrictions - HP Aruba JL253A Management And Configuration Manual

• In a local mirroring session, the exit port is configured with the mirror <session-number> port
command
• In a remote mirroring session, the remote exit port is configured with the mirror endpoint ip and
mirror <session-number> remote ip commands.
Restriction: In a policy, you can configure only one mirroring session per class. However, you can configure the
same session for different classes.
Mirroring is not executed on packets that match ignore criteria in a class.
The execution of mirroring actions is performed in the order in which the classes are numerically listed in the
policy.
The complete no form of the class action mirror command or the no <seq-number> command
removes a class and mirroring action from the policy configuration.
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.
Prerequisite: The local or remote exit port for a session must be already configured with a destination device
before you enter the mirror <session> parameter in a default-class action statement.
5. Apply the mirroring policy to inbound traffic on a port (interface service-policy in command) or VLAN
(vlan service-policy in command) interface.
Restrictions: The following restrictions apply to a mirroring service policy:
• Only one mirroring policy is supported on a port or VLAN interface.
• If you apply a mirroring policy to a port or VLAN interface on which a mirroring policy is already configured,
the new policy replaces the existing one.
• A mirroring policy is supported only on inbound traffic.
Because only one mirroring policy is supported on a port or VLAN interface, ensure that the policy you want to
apply contains all the required classes and actions for your configuration.

Classifier-based mirroring restrictions

The following restrictions apply to mirroring policies configured with the classifier-based model:
Chapter 12 Monitoring and Analyzing Switch Operation
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 that uses IPv4 encapsulation, if the remote switch is not already
configured as the destination for the session, its performance may be adversely affected by the
stream of mirrored traffic.
For this reason, Hewlett Packard Enterprise strongly recommends that you first configure the exit
switch in a remote mirroring session before you apply a mirroring service policy on a port or VLAN
interface.
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