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Catalyst 3750-X and 3560-X Switch Software Configuration Guide

OL-25303-03

Chapter 1 Configuring SPAN and RSPAN

Configuring SPAN and RSPAN

• Default SPAN and RSPAN Configuration, page 1-12

• Configuring Local SPAN, page 1-12

• Configuring RSPAN, page 1-17

Default SPAN and RSPAN Configuration

Configuring Local SPAN

• SPAN Configuration Guidelines, page 1-12

• Creating a Local SPAN Session, page 1-13

• Creating a Local SPAN Session and Configuring Incoming Traffic, page 1-15

• Specifying VLANs to Filter, page 1-16

SPAN Configuration Guidelines

• On each switch stack, you can configure a maximum of 2 source sessions and 64 RSPAN destination

sessions. A source session is either a local SPAN session or an RSPAN source session.

• For SPAN sources, you can monitor traffic for a single port or VLAN or a series or range of ports

or VLANs for each session. You cannot mix source ports and source VLANs within a single SPAN

session.

• The destination port cannot be a source port; a source port cannot be a destination port.

• You cannot have two SPAN sessions using the same destination port.

• When you configure a switch port as a SPAN destination port, it is no longer a normal switch port;

only monitored traffic passes through the SPAN destination port.

• Entering SPAN configuration commands does not remove previously configured SPAN parameters.

You must enter the no monitor session {session_number | all | local | remote} global configuration

command to delete configured SPAN parameters.

Table 1-1 Default SPAN and RSPAN Configuration

Feature Default Setting

SPAN state (SPAN and RSPAN) Disabled.

Source port traffic to monitor Both received and sent traffic (both).

Encapsulation type (destination port) Native form (untagged packets).

Ingress forwarding (destination port) Disabled

VLAN filtering On a trunk interface used as a source port, all VLANs are

monitored.

RSPAN VLANs None configured.

Cisco Catalyst 3560-X User Manual

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