Specifying Vlans To Filter - Cisco Catalyst 3750 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
Step 4
monitor session session_number filter vlan
vlan-id [, | -]
Step 5 monitor session session_number
destination {interface interface-id [, | -]
[encapsulation replicate]}
Step 6 end
Step 7
show monitor [session session_number]
show running-config
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.
78-15870-01
Purpose
Enter global configuration mode.
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.
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.
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.
Specify the SPAN session and the destination port (monitoring port).
For session_number, specify the session number entered in step 3.
For interface-id, specify the destination port. The destination
interface must be a physical port; it cannot be an EtherChannel, and it
cannot be a VLAN.
(Optional) [, | -] Specify a series or range of interfaces. Enter a space
before and after the comma; enter a space before and after the hyphen.
(Optional) Enter encapsulation replicate to specify that the
destination interface replicates the source interface encapsulation
method. If not selected, the default is to send packets in native form
(untagged).
Return to privileged EXEC mode.
Verify the configuration.
(Optional) Save the configuration in the configuration file.
Catalyst 3750 Metro Switch Software Configuration Guide
Configuring SPAN and RSPAN
21-15