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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 24 Configuring SPAN and RSPAN
Configuring SPAN
SPAN and RSPAN Session Limits
You can configure (and store in NVRAM) one local SPAN session or multiple RSPAN sessions on a
switch. The number of active sessions and combinations are subject to these restrictions:
• SPAN or RSPAN source (rx, tx, both): 1 active session limit. (SPAN and RSPAN are mutually
exclusive on a source switch).
• RSPAN source sessions have one destination per session with an RSPAN VLAN associated for that
session.
• Each RSPAN destination session has one or more destination interfaces for each RSPAN VLAN that
they support.
• RSPAN destination sessions are limited to two, or one if a local SPAN or a source RSPAN session
is configured on the same switch.
Default SPAN and RSPAN Configuration
Table 24-1 shows the default SPAN and RSPAN configuration.
Configuring SPAN
This section describes how to configure SPAN on your switch. It contains this configuration information:
• SPAN Configuration Guidelines, page 24-7
• Creating a SPAN Session and Specifying Ports to Monitor, page 24-8
• Creating a SPAN Session and Enabling Ingress Traffic, page 24-9
• Removing Ports from a SPAN Session, page 24-11
SPAN Configuration Guidelines
Follow these guidelines when configuring SPAN:
• SPAN sessions can coexist with RSPAN sessions within the limits described in the “SPAN and
RSPAN Session Limits” section on page 24-7.
• The destination port cannot be a source port; a source port cannot be a destination port.
• You can have only one destination port per SPAN session. You cannot have two SPAN sessions using
the same destination port.
• An EtherChannel port can be a SPAN source port; it cannot be a SPAN destination port.
Table 24-1 Default SPAN and RSPAN Configuration
Feature Default Setting
SPAN state Disabled.
Source port traffic to monitor Both received and sent traffic (both).
Encapsulation type (destination port) Native form (no encapsulation type header).
Ingress forwarding (destination port) Disabled.
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