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19-8
Chapter 19
Cajun P550/P880 /P882 Switch User Guide
Setting Up a Mirror Port
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.
You can setup a mirror port using either the web agent or the CLI.
Setting Up a
Mirror Port
Using the Web
Agent
To set up an RMON mirror port using the web agent:
1. Select Sampling from the Port Mirroring group on the web
agent window. The Port Mirroring Information dialog box
opens (Figure19-4).
Figure 19-4. Port Mirroring Information Dialog Box