3Com Switch 7750 Configuration Guide

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692 CHAPTER 62: MIRRORING CONFIGURATION

Configuring remote port mirroring on the intermediate switch

When a switch functions as the intermediate device or destination device for

remote mirroring, you are recommended to configure traffic redirect on the

incoming port in order to guarantee data mirroring is achieved normally. By

configuring traffic redirect, you can redirect all packets of the remote-probe VLAN

to the corresponding outgoing port (on the intermediate device) or mirroring

destination port (on the destination device). If you want to mirror packets in both

directions, you must configure traffic redirect on the incoming port because the

incoming port learns the source MAC addresses and destination MAC addresses of

packets at the same time. If the incoming port of a packet is the same as the

outgoing port of the packet, the packet is dropped. Refer to “Configuring

Redirect” on page 673 for configuring traffic redirect.

Configuring remote port mirroring on the destination switch

Table 557 Configure remote port mirroring on the intermediate switch

Operation Command Description

Enter system view system-view -

Create a remote-probe VLAN

and enter VLAN view

vlan vlan-id vlan-id is the ID of the

remote-probe VLAN.

Define the current VLAN as a

remote-probe VLAN

remote-probe vlan enable Required

Exit current view quit -

Enter port view of the relay

port through which the

intermediate switch is

connected to the source

switch, destination switch or

another intermediate switch

interface interface-type

interface-number

Configure the current port as

a trunk port

port link-type trunk Required

By default, the type of the

port is access.

Configure the relay port to

permit packets from the

remote-probe VLAN to pass

port trunk permit vlan

remote-probe-vlan-id

Required

This configuration is necessary

for ports on the intermediate

switch that are connected to

the source switch or the

destination switch.

Table 558 Configure remote port mirroring on the destination switch