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How to configure SPAN and RSPAN in Cisco Catalyst switches

span

Switch#conf t
Switch(config)#monitor session 1 source interface Gi0/1 rx
Switch(config)#monitor session 1 destination interface Gi0/2
Switch(config)#end
 
Rspan
 
(Source switch)
Switch1#conf t
Switch1(config)#vlan 30
Switch1(config-vlan)#name RSPAN-Vlan
Switch1(config-vlan)#remote-span
Switch1(config-vlan)#exit
Switch1(config)#monitor session 1 source interface Gi0/1 rx
Switch1(config)#monitor session 1 destination remote vlan 30
Switch1(config)#end

Allow vlan id 30 on the trunk port Gi0/2
Switch1#sh run int g0/2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,20,30
switchport mode trunk

(destination switch)
Switch2#conf t
Switch2(config)#vlan 30
Switch2(config-vlan)#name RSPAN-Vlan
Switch2(config-vlan)#remote-span Switch2(config-vlan)#exit
Switch2(config)#monitor session 1 destination interface Gi0/2
Switch2(config)#monitor session 1 source remote vlan 30
Switch2(config)#end
Allow vlan id 30 on the trunk port Gi0/1
Switch2#sh run int g0/1
 switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,20,30
 switchport mode trunk
With the config above, incoming traffic passing through port Gi0/1 on Switch1 will be mirrored to port Gi0/2 onSwitch2 and captured by a traffic analyzer on compuetr connected to port Gi0/2.
 

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