Port Mirroring Configuration; Introduction To Port Mirroring; Classification Of Port Mirroring; Implementing Port Mirroring - 3Com S7906E Configuration Manual

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Port Mirroring Configuration

When configuring port mirroring, go to these sections for information you are interested in:

Introduction to Port Mirroring

Configuring Local Port Mirroring
Configuring Layer 2 Remote Port Mirroring
Configuring Layer 3 Remote Port Mirroring
Configuring Local Port Mirroring for an ONU
Displaying and Maintaining Port Mirroring
Port Mirroring Configuration Examples
Introduction to Port Mirroring
Port mirroring is to copy the packets passing through a port (called a mirroring port) to another port
(called the monitor port) connected with a monitoring device for packet analysis.
You can select to port-mirror inbound, outbound, or bidirectional traffic on a port as needed.

Classification of Port Mirroring

Port mirroring falls into the following types:
Local port mirroring: In local port mirroring, the mirroring port and the monitor port are located on
the same device.
Layer 2 remote port mirroring: In Layer 2 remote port mirroring, the mirroring port and the monitor
port are located on different devices on a same Layer 2 network.
Layer 3 remote port mirroring: In Layer 3 remote port mirroring, the mirroring port and the monitor
port are separated by IP networks.
As a monitor port can monitor multiple ports, it may receive multiple duplicates of a packet in some
cases. Suppose 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.
Given an S7900E series switch, if incoming traffic is mirrored, the mirrored traffic is sent with the
same VLAN tag (if any) as the original traffic; if the outgoing traffic is mirrored, the mirrored traffic
carries the same VLAN tag as the original traffic did before it was sent out the mirroring ports.

Implementing Port Mirroring

Port mirroring is implemented through port mirroring groups. There are three types of mirroring groups:
local, remote source, and remote destination.
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