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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 21 Configuring SPAN and RSPAN Configuring RSPAN

Specifying VLANs to Filter

Beginning in privileged EXEC mode, follow these steps to limit RSPAN source traffic to specific
VLANs:
To monitor all VLA Ns on the trun k port, use the no monitor session session_number filter vlan global
configurati on comm a nd.
This exam ple sh ows how to cle ar a ny existing configura tio n on R S PA N se ssion 2, configure RSPAN
session 2 to monitor traffic received on trunk port 4, and send traffi c for only VLANs 1 through 5 and 9
to destination remote VLAN 902 with port 8 as the reflector port.
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 remote vlan 902 reflector-port
gigabitethernet0/8
Switch(config)# end
Command Purpose
Step 1 configure terminal Enter glob al co nfiguration mo de.
Step 2 no monitor session {session_number | all |
local | remote}Clear any existing SPAN configuration f or the se ssion .
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 s ession session_n umber source
interface interface-id rx Specify the characteristics of the source port ( monitored port) and
RSPAN session.
For session_number, specify 1 or 2.
For interface-id, specify the source port to monitor. The interface
specified must al rea dy be c onfigure d as a trun k p ort.
Step 4 monitor session session_number filt er vlan
vlan -id [, | -]Limit the RSPAN source traffic to specific VLANs.
For session_number, specify 1 or 2.
For vlan-id, the ra nge is 1 to 4094; do not enter leadin g 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
comm a; enter a space befo re and aft er the hyphe n.
Step 5 monitor s ession session_number
destination remote vlan v lan-i d refle c tor
port interface
Specify the RSPAN session, the destination remote VLAN, and the
refle ctor p ort.
For session_number, enter 1 o r 2.
For vl a n-i d , specify the RSPAN VLAN to carry the monitored tr affic
to the destination port.
For interface, specify the interface that will flood the RSPAN traffic
to the RSPAN VLAN.
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.