Monday, March 24, 2008

Configuring Remote SPAN

Remote SPAN allows source ports and destination ports to be located on different switches. It uses a SPAN VLAN to transmit a copy of span data from source across the network to destination. You have to define and allow the SPAN VLAN in all network devices in the path.

1. Firstly, create a VLAN on each network switches in the path:
SW1(config)# vlan 456
SW1(config-vlan)# remote-span

VLAN 456 is a remote span VLAN.

2. Setup the SPAN destination port, which is where the sniffer plugged to.

SW1(config)# monitor session 1 source remote vlan 456
SW1(config)# monitor session 1 destination interface gi4/1

3. If you want to monitor the host on SW2 port gi5/10 , the RSPAN session could be completed as follows:

SW2(config)# monitor session 1 source interface gi5/10
SW2(config)# monitor session 1 destination remote vlan 456

1 comment:

Anonymous said...

Good stuff! Easy to understand with example!