Setting Up Port Mirroring - Avaya Cajun P882 User Manual

Chapter 19

Setting Up Port Mirroring

19-8
Configuring an RMON mirror port allows you to mirror traffic from
a port or set of ports to a specific mirror port, where you can attach a
sniffer or RMON probe. The switch supports a single mirror port and
a single source port for each switch fabric port. For example, 20-port
Fast Ethernet cards have two fabric ports (one for ports 1 through
10, one for ports 11 through 20). You can set up a single source port
and a single mirror port for each set of ports associated with a fabric
port. You can also choose to mirror all traffic from a particular fabric
port to the mirror port, or set up multiple source ports to mirror
traffic to a single mirror port.
Packets addressed to the CPU, such as pings, are duplicated out of
the mirror port. Tagged packets that are sent into a source port with
a VLAN ID to which the source port is not bound, are not
transmitted out the mirror port. VLAN tag information is not
propagated to the mirror port.
* Note: To prevent unnecessary traffic flooding on a mirror port,
put the mirror port on the same VLAN as the source
port.
Two port mirroring features are available for the Avaya Multiservice
switches: Fabric mode 1 port mirroring and Fabric mode 2 port
mirroring. The switch must be in Fabric mode 2 to perform Fabric
mode 2 port mirroring.
Fabric mode 1 port mirroring works with 50-series modules. Fabric
mode 2 port mirroring works with 80-series modules.
* Note: If you use port mirroring, the Frame Tags field on the
Switch Port Configuration Web page for the port must
be set to Use (default).
Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1