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Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
Chapter 21 Configuring SPAN and RSPAN
Configuring SPAN
Specifying VLANs to Filter
Beginning in privileged EXEC mode, follow these steps to limit SPAN source traffic to specific VLANs:
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
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
no monitor session {session_number | all |
local | remote}
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.
Step 3
monitor session session_number source
interface interface-id rx
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.
Step 4
monitor session session_number filter vlan
vlan-id [, | -]
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.
Step 5
monitor session session_number
destination interface interface-id
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.
Step 6
end Return to privileged EXEC mode.
Step 7
show monitor [session session_number] Verify your entries.
Step 8
copy running-config startup-config (Optional) Save your entries in the configuration file.