SPAN & RSPAN

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Switch Port Analyzer

Incompatible with 902.1x
Destination ports do not support layer 2 protocols (CDP, STP, VTP, DTP)
Maximum 64 destinations per switch
When source is a trunk, use "filter vlan" to filter out vlans

Configuration

config# monitor session 1 source interface fa0/12
config# monitor session 1 destination interface fa0/2
config# monitor session 1 source interface fa0/11 [rx|tx]
config# monitor session 1 filter 1 - 3, 299
config# monitor session 1 destination interface fa0/10 encapsulation replicate

RSPAN

config# vlan 199
config-vlan# remote span
config# monitor session 3 source vlan 66 - 68
config# monitor session 3 destination remote vlan 199
config# monitor session 4 source remote vlan 199
config# monitor session 4 destination interface fa0/24

View/Debug Commands

show monitor session