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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
78-17058-01
Chapter 24 Configuring SPAN and RSPAN
Configuring SPAN and RSPAN
This example shows how to configure VLAN 901 as the source remote VLAN and port 1 as the
destination interface:
Switch(config)# monitor session 1 source remote vlan 901
Switch(config)# monitor session 1 destination interface gigabitethernet0/1
Switch(config)# end
Creating an RSPAN Destination Session and Configuring Ingress Traffic
Beginning in privileged EXEC mode, follow these steps to create an RSPAN destination session, to
specify the source RSPAN VLAN and the destination port, and to enable ingress traffic on the destination
port for a network security device (such as a Cisco IDS Sensor Appliance).
Note For details about the keywords not related to ingress traffic, see the “Creating an RSPAN Destination
Session” section on page 24-19. This procedure assumes that the RSPAN VLAN has been configured.
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.
Step 3
monitor session session_number source
remote vlan vlan-id
Specify the RSPAN session and the source RSPAN VLAN.
For session_number, the range is 1 to 66.
For vlan-id, specify the source RSPAN VLAN to monitor.
Step 4
monitor session session_number
destination {interface interface-id [, | -]
[ingress {dot1q vlan vlan-id | untagged
vlan vlan-id | vlan vlan-id}]}
Specify the SPAN session, the destination port, the packet
encapsulation, and the ingress VLAN and encapsulation.
For session_number, enter the number defined in Step 4.
Note In an RSPAN destination session, you must use the same session
number for the source RSPAN VLAN and the destination port.
For interface-id, specify the destination interface. The destination
interface must be a physical interface.
Note Though visible in the command-line help string, encapsulation
replicate is not supported for RSPAN. The original VLAN ID
is overwritten by the RSPAN VLAN ID, and all packets appear
on the destination port as untagged.
(Optional) [, | -] Specify a series or range of interfaces. Enter a space
before and after the comma; enter a space before and after the hyphen.
Enter ingress with additional keywords to enable ingress traffic
forwarding on the destination port and to specify the encapsulation
type:
• dot1q vlan vlan-id—Forward incoming packets with IEEE 802.1Q
encapsulation with the specified VLAN as the default VLAN.
• untagged vlan vlan-id or vlan vlan-id—Forward incoming packets
with untagged encapsulation type with the specified VLAN as the
default VLAN.