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Chapter 26
Configuring SPAN
Configuring SPAN
These sections contain this configuration information:
•
•
Default SPAN Configuration
Table 26-1
Table 26-1
Feature
SPAN state
Source port traffic to monitor
Encapsulation type (destination port)
Ingress forwarding (destination port)
VLAN filtering
Configuring Local SPAN
These sections contain this configuration information:
•
•
•
•
SPAN Configuration Guidelines
Follow these guidelines when configuring SPAN:
•
•
•
•
•
OL-23389-01
Default SPAN Configuration, page 26-7
Configuring Local SPAN, page 26-7
shows the default SPAN configuration.
Default SPAN Configuration
SPAN Configuration Guidelines, page 26-7
Creating a Local SPAN Session, page 26-8
Creating a Local SPAN Session and Configuring Incoming Traffic, page 26-11
Specifying VLANs to Filter, page 26-12
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} global configuration command
to delete configured SPAN parameters.
Default Setting
Disabled.
Both received and sent traffic (both).
Native form (untagged packets).
Disabled
On a trunk interface used as a source port, all VLANs are
monitored.
Catalyst 2928 Switch Software Configuration Guide
Configuring SPAN
26-7
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Troubleshooting
