Specifying Vlans To Filter - Cisco 2950G 24 - Catalyst Switch Software Configuration Manual

Chapter 21 Configuring SPAN and RSPAN

Specifying VLANs to Filter

Beginning in privileged EXEC mode, follow these steps to limit SPAN source traffic to specific VLANs:
Command
Step 1
configure terminal
Step 2
no monitor session {session_number | all |
local | remote}
Step 3
monitor session session_number source
interface interface-id rx
Step 4 monitor session session_number filter vlan
vlan-id [, | -]
Step 5
monitor session session_number
destination interface interface-id
Step 6
end
Step 7 show monitor [session session_number]
Step 8
copy running-config startup-config
To monitor all VLANs on the trunk port, use the no monitor session session_number filter global
configuration command.
This example shows how to clear any existing configuration on SPAN session 2, configure SPAN session
2 to monitor traffic received on trunk port 4, and send traffic for only VLANs 1 through 5 and 9 to
destination port 8.
Switch(config)# no monitor session 2
Switch(config)# monitor session 2 source interface gigabitethernet0/4 rx
Switch(config)# monitor session 2 filter vlan 1 - 5 , 9
Switch(config)# monitor session 2 destination interface gigabitethernet0/8
Switch(config)# end
78-14982-01
Purpose
Enter global configuration mode.
Clear any existing SPAN configuration for the session.
For session_number, specify 1 or 2.
Specify all to remove all SPAN sessions, local to remove all local
sessions, or remote to remove all remote SPAN sessions.
Specify the characteristics of the source port (monitored port) and
SPAN session.
For session_number, specify 1 or 2.
For interface-id, specify the source port to monitor. The interface
specified must already be configured as a trunk port.
Limit the SPAN source traffic to specific VLANs.
For session_number, specify 1 or 2.
For vlan-id, the range is 1 to 4094; do not enter leading zeros.
(Optional) Use a comma (,) to specify a series of VLANs or use a
hyphen (-) to specify a range of VLANs. Enter a space after the
comma; enter a space before and after the hyphen.
Specify the characteristics of the destination port (monitoring port)
and SPAN session.
For session_number, specify 1 or 2.
For interface-id, specify the destination port. Valid interfaces include
physical interfaces.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Catalyst 2950 Desktop Switch Software Configuration Guide
Configuring SPAN
21-13