Cisco 300 Series Cli Manual page 740

Stackable managed switches

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Table of Contents

Port Monitor Commands

OL-32830-01 Command Line Interface Reference Guide

User Guidelines

This command enables port copy between source port (src-interface) to a

destination port (The port in context).

The analyzer port for port ingress traffic mirroring should be the same port for all

mirrored ports.

The analyzer port for port egress traffic mirroring should be the same port for all

mirrored ports.

Traffic routed to source interface or source VLANs cannot be monitored.

The analyzer port for VLAN mirroring should be the same for all the mirrored

VLANs, and should be the same port as the analyzer port for port ingress mirroring

Source ports cannot be destination ports at the same time.

The following restrictions apply to ports that are configured to be monitor ports:

The port is not a member in a port-channel.

An IP interface is not configured on the port.

GVRP is not enabled on the port.

The port is not a member in any VLAN, except for the default VLAN (will be

automatically removed from the default VLAN).

L2 protocols, such as: LLDP, CDP, LBD, STP, LACP, are not active on the

destination port.

1. In this mode some traffic duplication on the analyzer port may be observed. For

Port 2 is being egress monitored by port 4.

Port 2 & 4 are members in VLAN 3.

An unknown unicast packet sent to VLAN 3 will egress from port 4 twice,

once as normal forward and another time as mirrored from port 2.

Moreover, if port 2 is an untagged member in VLAN 3 and port 4 is a

tagged member then both instances will look different (one is tagged

and the other is not).

When the port is configured to 802.1X auto mode, it will forward any mirrored traffic regardless of the

802.1X state. However, it will operate as a normal network port (forward traffic) only after

authorization is done.