3Com Switch 4200G Configuration Guide

238 CHAPTER 28: CONFIGURATION FOR MIRRORING FEATURES
■ Intermediate switch: the switch between the source and the destination switch on
the network.
■ Destination switch: the switch to which the destination port for remote mirroring
belongs.
Table 206 describes how the ports on various switches are involved in the mirroring
operation.
To implement remote port management, you need to define a special VLAN, called
Remote-probe VLAN, on all the three types of switches. All mirrored packets will be
transferred to the mirrored ports of the destination switch from the source switch
using this VLAN. Thus, the destination switch can monitor the port packets sent from
the remote ports of the source switch. Remote-probe VLAN has the following
features:
■ The ports connecting the devices and in remote-probe VLAN must be of trunk
type.
■ The default VLAN, management VLAN, and super VLAN cannot be configured as
remote-probe VLAN.
CAUTION: You are not recommended to perform any of the following operations on
the remote-probe VLAN:
Configuring a source port to the remote-probe VLAN that is used by the local
mirroring group
Configuring a Layer 3 interface
Running other protocol packets, or bearing other service packets;
Using remote-probe VLAN as a special type of VLAN, such as sub VLAN, voice VLAN
or protocol VLAN
Table 206 Ports involved in the mirroring operation
Switch Ports involved Function
Source switch Source port Port to be mirrored; copy user data packets to the
specified reflector port through local port
mirroring. There can be more than one source
port.
Reflector port Receive user data packets that are mirrored on a
local port.
Trunk port Send mirrored packets to the intermediate switch
or the destination switch.
Intermediate
switch
Trunk port Send mirrored packets to the destination switch.
Two Trunk ports are necessary for the intermediate
switch to be connected to devices that are
connected to the source switch and the destination
switch.
Destination switch Trunk port Receive remote mirrored packets.
Destination port Monitor remote mirrored packets