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Configuring flow mirroring
Overview
Flow mirroring copies packets matching a class to a destination for analyzing and monitoring. It is
implemented through QoS policies.
To configure flow mirroring, perform the following tasks:
• Define traffic classes and configure match criteria to classify packets to be mirrored. Flow
mirroring allows you to flexibly classify packets to be analyzed by defining match criteria.
• Configure traffic behaviors to mirror the matching packets to the specified destination.
You can configure an action to mirror matching packets to one of the following destinations:
• Interface—The matching packets are copied to an interface connecting to a data monitoring
device. The data monitoring device analyzes the packets received on the interface.
• CPU—The matching packets are copied to the CPU of the IRF member device where they are
received. The CPU analyzes the packets or delivers them to upper layers.
For more information about QoS policies, traffic classes, and traffic behaviors, see ACL and QoS
Configuration Guide.
Flow mirroring configuration task list
Tasks at a glance
(Required.) Configuring match criteria
(Required.) Configuring a traffic behavior
(Required.) Configuring a QoS policy
(Required.) Applying a QoS policy:
• Applying a QoS policy to an interface
• Applying a QoS policy to a VLAN
• Applying a QoS policy globally
• Applying a QoS policy to the control plane
For more information about the following commands except the mirror-to command, see ACL and
QoS Command Reference.
Configuring match criteria
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Create a class and enter
class view.
traffic classifier
tcl-name
[
operator
{
and
|
or
} ]
By default, no traffic class exists.
3. Configure match criteria.
if-match
match-criteria
By default, no match criterion is
configured in a traffic class.
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