H3C Technologies H3C MSR 50 - Manual (Page 183)

Configuring port mirroring
You cannot configure a Layer 2 mirroring group with the source ports and the monitor port located on
different cards of the same device, but you can configure that for a Layer 3 mirroring group.
The H3C MSR routers do not support configuring source ports in CPOS interface view.
The H3C MSR routers do not support using an aggregate interface as the monitor port.
SIC-4FSW modules, DSIC-9FSW modules, MSR 20-1X routers, and fixed Layer 2 Ethernet ports do not
support inter-VLAN mirroring. Before configuring a mirroring group, make sure all ports in the mirroring
group belong to the same VLAN. If a port in an effective mirroring group leaves a mirroring VLAN, the
mirroring function does not take effect. You must remove the mirroring group and configure a new one.
Overview
Port mirroring refers to copying packets that are passing through a port to a monitor port that is
connected to a monitoring device for packet analysis.
Terminologies of port mirroring
Mirroring source
The mirroring source can be one or more monitored ports. Packets (called "mirrored packets") passing
through them are copied to a port that is connected to a monitoring device for packet analysis. This type
of port is called a "source port" and the device where the mirroring source resides is called a "source
device."
Mirroring destination
The mirroring destination is the destination port (also known as the monitor port) of mirrored packets. It
connects to the data monitoring device. The device where the monitor port resides is called the
"destination device." The monitor port forwards mirrored packets to its connected monitoring device.
A monitor port might receive multiple duplicates of a packet in some cases because it can monitor
multiple mirroring sources. For example, assume that Port 1 is monitoring bidirectional traffic on Port 2
and Port 3 on the same device. If a packet travels from Port 2 to Port 3, two duplicates of the packet will
be received on Port 1.
Mirroring direction
The mirroring direction indicates that the inbound, outbound, or bidirectional traffic can be copied on a
mirroring source:
• Inbound—Copies packets received on a mirroring source.
• Outbound—Copies packets sent out of a mirroring source.
• Bidirectional—Copies packets both received on and sent out of a mirroring source.
Local mirroring group
Port mirroring is implemented through mirroring groups. Mirroring source and mirroring destination are
in a same mirroring group.
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