Default Span And Rspan Configuration; Configuring Span; Span Configuration Guidelines - Cisco 2950 - Catalyst Switch Configuration Manual

Chapter 25 Configuring SPAN and RSPAN

Default SPAN and RSPAN Configuration

Table 25-1
Table 25-1 Default SPAN and RSPAN Configuration
Feature
SPAN state
Source port traffic to monitor
Encapsulation type (destination port)
Ingress forwarding (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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78-11380-10
shows the default SPAN and RSPAN configuration.
SPAN Configuration Guidelines, page 25-7
Creating a SPAN Session and Specifying Ports to Monitor, page 25-8
Creating a SPAN Session and Enabling Ingress Traffic, page 25-9
Removing Ports from a SPAN Session, page 25-11
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.
For SPAN source ports, you can monitor sent and received traffic for a single port or for a series or
range of ports.
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.
You can configure a disabled port to be a source or destination port, but the SPAN function does not
start until the destination port and at least one source port is enabled.
A SPAN destination port never participates in any VLAN spanning tree. SPAN does include BPDUs
in the monitored traffic, so any spanning-tree BPDUs received on the SPAN destination port for a
SPAN session were copied from the SPAN source ports.
Default Setting
Disabled.
Both received and sent traffic (both).
Native form (no encapsulation type header).
Disabled.
25-6.
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
Configuring SPAN
"SPAN and
25-7