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Catalyst 3750 Switch Software Configuration Guide
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Chapter 27 Configuring SPAN and RSPAN
Configuring SPAN and RSPAN
Default SPAN and RSPAN Configuration
Table 27-1 shows the default SPAN and RSPAN configuration.
Configuring Local SPAN
This section describes how to configure Local SPAN on your switch. It contains this configuration
information:
• SPAN Configuration Guidelines, page 27-11
• Creating a Local SPAN Session, page 27-12
• Creating a Local SPAN Session and Configuring Ingress Traffic, page 27-15
• Specifying VLANs to Filter, page 27-16
SPAN Configuration Guidelines
Follow these guidelines when configuring SPAN:
• You can configure a total of two local SPAN sessions or RSPAN source sessions on each switch
stack. You can have a total of 66 SPAN sessions (local, RSPAN source, and RSPAN destination) on
a switch stack.
• If a 10-Gigabit Ethernet module port is configured as a SPAN or RSPAN destination port, its link
rate decreases.
• 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.
Yo u mu s t en ter t he no monitor session {session_number | all | local | remote} global configuration
command to delete configured SPAN parameters.
Table 27-1 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.
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