Creating A Local Span Session - Cisco Catalyst 2928 Software Configuration Manual

Configuring SPAN
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Creating a Local SPAN Session

Beginning in privileged EXEC mode, follow these steps to create a SPAN session and specify the source
(monitored) ports or VLANs and the destination (monitoring) ports:
Command
Step 1
configure terminal
Step 2 no monitor session {session_number | all |
local}
Catalyst 2928 Switch Software Configuration Guide
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For local SPAN, outgoing packets through the SPAN destination port carry the original
encapsulation headers—untagged or IEEE 802.1Q—if the encapsulation replicate keywords are
specified. If the keywords are not specified, the packets are sent in native form.
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 or source VLAN are enabled.
You can limit SPAN traffic to specific VLANs by using the filter vlan keyword. If a trunk port is
being monitored, only traffic on the VLANs specified with this keyword is monitored. By default,
all VLANs are monitored on a trunk port.
You cannot mix source VLANs and filter VLANs within a single SPAN session.
Purpose
Enter global configuration mode.
Remove any existing SPAN configuration for the session.
For session_number, the range is 1 to 66.
Specify all to remove all SPAN sessions and local to remove all local
sessions.
Chapter 26 Configuring SPAN
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