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Configuring flow mirroring
The flow mirroring feature is available on both Layer 2 and Layer 3 Ethernet interfaces. The term
"interface" in this chapter collectively refers to these two types of interfaces. You can use the port
link-mode command to configure an Ethernet port as a Layer 2 or Layer 3 interface (see Layer 2—LAN
Switching Configuration Guide).
Flow mirroring copies packets matching a class to a destination for packet 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 the 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.
Flow mirroring configuration task list
Tasks at a
lance
(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
Ste
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.
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