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Monitoring and Analyzing Switch Operation
Traffic Mirroring
Deprecation of
ACL-based
Traffic
Selection
In software release K.14.01 or greater, advanced classifier-based policies
replace ACL-based traffic selection in mirroring configurations.
Like ACL-based traffic-selection criteria, classifier-based service policies
apply only to inbound traffic flows and are configured on a per-port or per-
VLAN basis. In a mirroring session, classifier-based service policies do not
support:
■ The mirroring of outbound traffic exiting the switch
■ The use of meshed ports as monitored (source) interfaces
Classifier-based mirroring is not designed to work with other traffic-selection
methods in a mirroring session applied to a port or VLAN interface:
■ If a mirroring session is already configured with one or more traffic-
selection criteria (MAC-based or all inbound and/or outbound traffic), the
session does not support the addition of a classifier-based policy.
■ If a mirroring session is configured to use a classifier-based mirroring
policy, no other traffic-selection criteria (MAC-based or all inbound and/
or outbound traffic) can be added to the session on the same or a different
interface.
Classifier-based mirroring policies provide greater precision when analyzing
and debugging a network traffic problem. Using multiple match criteria, you
can finely select and define the classes of traffic that you want to mirror on a
traffic analyzer or IDS device.
For more information on how to configure and use classifier-based service
policies, refer to the “Classifier-Based Software Configuration” chapter in the
Advanced Traffic Management Guide.
For an example of a mirroring configuration that uses a classifier-based
service policy to select traffic on a monitored interface, see “Example: Remote
Mirroring Using a Classifier-Based Policy” on page B-88.
Classifier-Based Mirroring Configuration
To use the classifier-based model to configure a mirroring policy and apply it
to a selected class of traffic on a port or VLAN interface, follow these steps:
1. Evaluate the types of traffic in your network and identify the traffic types
that you want to mirror.
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