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Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter37 Configuring SPAN and RSPAN
Configuring RSPAN
Creating an RSPAN Session
First create an RSPAN VLAN that does not exist for the RSPAN session in any of the switches that will
participate in RSPAN. With VTP enabled in the network, you can create the RSPAN VLAN in one
switch, and then VTP propagates it to the other switches in the VTP domain for VLAN-IDs that are lower
than 1005.
Use VTP pruning to get efficient flow of RSPAN traffic, or manually delete the RSPAN VLAN from all
trunks that do not need to carry the RSPAN traffic.
To start an RSPAN source session and to specify the source (monitored) ports and the destination RSPAN
VLAN, perform this task:
Command Purpose
Step1 Switch# configure terminal Enters global configuration mode.
Step2 Switch(config)# no monitor session
{
session_number
| all | local | remote}
Clears any existing RSPAN configuration for the session.
For session_number, specifies the session number identified with this
RSPAN session (1 through 6).
Specifies all to remove all RSPAN sessions, local to remove all local
sessions, or remote to remove all remote SPAN sessions.
Step3 Switch(config)# vlan {remote_vlan_ID} Specifies a remote VLAN ID.
Ensure that the VLAN ID is not being used for any user traffic.
Step4 Switch(config-vlan)# remote-span Converts the VLAN ID to a remote VLAN ID.
Step5 Switch(config-vlan)# exit Returns to global configuration mode.
Step6 Switch(config)# [no] monitor session
{
session_number
} {source {interface
<
interface_list>
| {vlan
vlan_IDs
| cpu
[queue
queue_ids
]} [rx | tx | both]
Specifies the RSPAN session and the source port (monitored port).
For session_number, specifies the session number identified with this
RSPAN session (1 through 6).
For interface-list, specifies the source port to monitor. Valid
interfaces include physical interfaces and port-channel logical
interfaces (port-channel port-channel-number).
For vlan-IDs, specifies the source VLAN or VLANs to monitor.
Valid VLANs are in the range from 1 to 4094.
For queue_ids, specifies either a set of CPU queue numerical
identifiers from 1 to 32, or a named queue.
(Optional) [, | -] Specifies a series or range of interfaces. Enter a
space after the comma; enter a space before and aft er the hyphen.
(Optional) Specifies the direction of traffic to monitor. If you do not
specify a traffic direction, the source interface sends both transmitted
(Tx) and received (Rx) traffic. Only received traffic can be monitored
on additional source ports.
•Rx—Monitor received traffic.
•Tx—Monitor transmitted traffic.
•both—Monitor both received and transmitted traffic
(bidirectional).