Cisco 300 Series Cli Manual page 449

Small business 300 series managed switches command line interface guide release 1.3

Table of Contents

Port Monitor Commands

78-21075-01 Command Line Interface Reference Guide

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.

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

The following restriction applies to ports that are configured to be source ports:

The port cannot be a destination port.

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

The port cannot be source port.

The port is not a member in port-channel.

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.

Unknown Unicast packet sent to VLAN 3 will egress from port 4 twice,

one instance as normal forward and another instance as mirrored from

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 tagged and

the other is not).

2. When the port is configured to 802.1X auto mode it will forward any mirrored

traffic regardless of the.1X state. However, it will operate as a normal network

port (forward traffic) only after authorization is done.