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Catalyst 2928 Switch Software Configuration Guide
OL-23389-01
Chapter 26 Configuring SPAN
Displaying SPAN Status
To monitor all VLANs on the trunk port, use the
no monitor session
session_number
filter
global
configuration command.
This example shows how to remove any existing configuration on SPAN session 2, configure SPAN
session 2 to monitor traffic received on Gigabit Ethernet trunk port 2, and send traffic for only VLANs
1 through 5 and VLAN 9 to destination Gigabit Ethernet port 1.
Switch(config)#
no monitor session 2
Switch(config)#
monitor session 2 source interface gigabitethernet0/2 rx
Switch(config)#
monitor session 2 filter vlan 1 - 5, 9
Switch(config)#
monitor session 2 destination interface gigabitethernet0/1
Switch(config)#
end
Displaying SPAN Status
To display the current SPAN configuration, use the
show monitor
user EXEC command. You can also
use the
show running-config
privileged EXEC command to display configured SPAN sessions.
Step 5
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).
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.
Command
Purpose
