Pre-requisites
- Basic Cisco command-line knowledge
Scenarios
Scenario 1: Multiple VLANs configured
Scenario 2: No VLANs/Default Cisco VLAN 1 configured
Scenario 3: One VLAN configured
Troubleshooting
Note: The VLAN and Interface IDs in the configuration provided below are only examples to assist in visualising what's required.
Scenario 1: Multiple VLANs Configured
!
vlan 200-206
!
interface FastEthernet0/37
end
!
!
interface FastEthernet0/47
switchport trunk allowed vlan 200-206
switchport mode trunk
end
!
monitor session 2 source interface Fa0/47
monitor session 2 destination interface Fa0/37
!
Scenario 2: No VLANs/Default Cisco VLAN 1 Configured
!
!
interface FastEthernet0/37
end
!
!
interface FastEthernet0/47
end
!
monitor session 2 source interface Fa0/47
monitor session 2 destination interface Fa0/37
!
Scenario 3: One VLAN Configured
!
vlan 200 (1-4094)
!
interface FastEthernet0/37
end
!
!
interface FastEthernet0/47
switchport access vlan 200
switchport mode access
end
!
monitor session 2 source interface Fa0/47
monitor session 2 destination interface Fa0/37
!
Troubleshooting Command
show monitor session 2 detail
!
See Also
To see how to setup Sinefa to receive span / mirror traffic see How to Setup Span and Mirror Port monitoring
More information on SPAN is available on the Cisco site
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