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Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
Chapter 21 Configuring SPAN and RSPAN
Configuring SPAN and RSPAN
Specifying VLANs to Filter
Beginning in privileged EXEC mode, follow these steps to configure the RSPAN source session to limit
RSPAN source traffic to specific VLANs:
To monitor all VLANs on the trunk port, use the no monitor session session_number filter vlan global
configuration command.
This example shows how to remove any existing configuration on RSPAN session 2, configure RSPAN
session 2 to monitor traffic received on a trunk port, and send traffic for only VLANs 1 through 5 and 9
to destination RSPAN VLAN 902.
Switch(config)# no monitor session 2
Switch(config)# monitor session 2 source interface gigabitethernet1/0/2 rx
Switch(config)# monitor session 2 filter vlan 1 - 5 , 9
Switch(config)# monitor session 2 destination remote vlan 902
Switch(config)# end
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
no monitor session {session_number | all |
local | remote}
Remove any existing SPAN configuration for the session.
For session_number, the range is from 1 to 66.
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
Specify the characteristics of the source port (monitored port) and
SPAN session.
For session_number, the range is from 1 to 66.
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, enter the session number specified in step 3.
For vlan-id, the range is 1 to 4094.
(Optional) Use a comma (,) to specify a series of VLANs or use a
hyphen (-) to specify a range of VLANs. Enter a space before and after
the comma; enter a space before and after the hyphen.
Step 5
monitor session session_number
destination remote vlan vlan-id
Specify the RSPAN session and the destination remote VLAN
(RSPAN VLAN).
For session_number, enter the session number specified in step 3.
For vlan-id, specify the RSPAN VLAN to carry the monitored traffic
to the destination port.
Step 6
end Return to privileged EXEC mode.
Step 7
show monitor [session session_number]
show running-config
Verify the configuration.
Step 8
copy running-config startup-config (Optional) Save the configuration in the configuration file.
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