3Com Switch 7750 Configuration Guide

Mirroring Configuration 691
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■ For a centralized I/O Module, if multiple source ports are specified in remote
port mirroring configuration, all the source ports must be on the same I/O
Module.
■ You can configure only one reflector port of a remote source mirroring group
or one destination port of a local mirroring group on each centralized I/O
Module. As for the distributed system, you can configure only one reflector
port of a remote source mirroring group or one destination port of a local
mirroring group for the whole system. Only one mirroring destination I/O
Module can be configured for the centralized or distributed system, and can be
referenced by only one local mirroring group.
■ To mirror tagged packets, you need to configure VLAN VPN on the reflector
port.
■ The reflector ports are mutually exclusive with STP or DLDP. That is, if STP or
DLDP is enabled on a port, you are not recommended to configure it as a
reflector port; and vice versa, you are not recommended to enable STP or DLDP
on a reflector port.
■ The reflector port cannot forward traffics as a normal port. Therefore, it is
recommended that you use an idle and in-down-state port as the reflector
port, and be careful to not add other settings on this port.
■ Be sure not to configure a port used to connect the intermediate and
destination switches as the mirroring source port. Otherwise traffic disorder
may occur in the network.
Configure a remote reflector
port
mirroring-group group-id
reflector-port reflector-port
Required
The remote reflector port
must be of the Access type.
LACP and must be disabled
on this port and you are
recommended to disable STP
on this port.
After a port is configured as a
reflector port, the switch does
not allow you to perform any
of the following
configurations:
■ Changing the port type
and its default VLAN ID
■ Add it to another VLAN
Configure the remote-probe
VLAN for the remote source
mirroring group
mirroring-group group-id
remote-probe vlan
remote-probe-vlan-id
Required
Display the configuration of
the remote source mirroring
group
display mirroring-group
remote-source
Optional
This command can be
executed in any view.
Table 556 Configure remote port mirroring on the source switch
Operation Command Description