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Catalyst 2960 Switch SoftwareConfiguration Guide
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Chapter23 Configuring SPAN and RSPAN
Configuring SPAN and RSPAN
This example shows how to remove any existing configuration on SPAN session 2, configure SPAN
session 2 to monitor received traffic on Gigabit Ethernet source port 1, and send it t o destination Gigabit
Ethernet port 2 with the same egress encapsulation type as the source port, and to enable ingress
forwarding with IEEE 802.1Q encapsulation and VLAN 6 as t he default ingress VLAN.
Switch(config)# no monitor session 2
Switch(config)# monitor session 2 source gigabitethernet0/1 rx
Switch(config)# monitor session 2 destination interface gigabitethernet0/2 encapsulation
replicate ingress dot1q vlan 6
Switch(config)# end
Specifying VLANs to Filter
Beginning in privileged EXEC mode, follow these steps to limit SPAN source traffic to specific VLANs:
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 no monitor session {session_number | all |
local | remote}
Remove any existing SPAN configuration for the session.
For session_number, the range is 1 to 66.
Specify all to remove all SPAN sessions, local to remove all local
sessions, or remote to remove all remote SPAN sessions.
Step3 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 1 to 66.
For interface-id, specify the source port to monitor. The interface
specified must already be configured as a trunk port.
Step4 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 .
Step5 monitor session session_number
destination {interface interface-id [, | -]
[encapsulation {dot1q | replicate}]}
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 dot1q to specify that the destination
interface uses the IEEE 802.1Q encapsulation method.
(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).
Step6 end Return to privileged EXEC mode.