Span And Rspan Session Limits; Default Span And Rspan Configuration; Configuring Span; Span Configuration Guidelines - Cisco 2950G 24 - Catalyst Switch Software Configuration Manual

Configuring SPAN

SPAN and RSPAN Session Limits

You can configure (and store in NVRAM) a maximum of two SPAN or RSPAN sessions on each switch.
You can divide the two sessions between SPAN, RSPAN source, and RSPAN destination sessions. You
can configure multiple source ports or source VLANs for each session.

Default SPAN and RSPAN Configuration

Table 21-1
Table 21-1 Default SPAN and RSPAN Configuration
Feature
SPAN state
Source port traffic to monitor
Encapsulation type (destination port)
Configuring SPAN
This section describes how to configure SPAN on your switch. It contains this configuration
information:
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SPAN Configuration Guidelines

Follow these guidelines when configuring SPAN:
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Catalyst 2950 Desktop Switch Software Configuration Guide
21-8
shows the default SPAN and RSPAN configuration.
SPAN Configuration Guidelines, page 21-8
Creating a SPAN Session and Specifying Ports to Monitor, page 21-9
Removing Ports from a SPAN Session, page 21-11
Specifying VLANs to Monitor, page 21-12
Specifying VLANs to Filter, page 21-13
SPAN sessions can coexist with RSPAN sessions within the limits described in the
RSPAN Session Limits" section on page
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.
An 802.1X port can be a SPAN source port. You can enable 802.1X on a port that is a SPAN
destination or reflector port; however, 802.1X is disabled until the port is removed as a SPAN
destination or reflector port.
For SPAN source ports, you can monitor transmitted traffic for a single port and received traffic for
a series or range of ports or VLANs.
Chapter 21
Default Setting
Disabled.
Both received and sent traffic (both); for additional
source ports or VLANs, only received (rx) traffic can be
monitored.
Native form (no encapsulation type header).
21-8.
Configuring SPAN and RSPAN
"SPAN and
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