Hello everyone,

I got into a situation here:

Hareware: Cisco Catalyst 2900XL
ISO: 12.0(5.1)XP

Say interface FE 0/1 is assigned to Vlan 10, and interface FE 0/2 is
assigned to Vlan 20. Is it possible to make interface FE 0/3 as a SPAN
port whcih monitors both FE 0/1 and FE 0/2 ? I need to attach a sniffer
onto FE 0/3 and analyst the traffic so FE 0/3 could not be a trunk port
(the sniffer doesn't understand VLAN taggings).

I know under normal circumstance this setup is not allowed (can't monitor
2 vlan traffic through 1 port). But is there a work around?

BTW, what's the meaning of the interface commands "switchport multi vlan"?
If I run this command on an interface, will this interface become a trunk
port or an access port? I can't seem to find out the detailed explanation
on this command from Cisco's website.

Thanks for your help!




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