[nsp] Port mirroring on 2924XL

[rpcbind at speakeasy.net]

> interface FastEthernet0/6
>   port monitor VLAN1
>   no cdp enable
> 
> and all ports are in VLAN 1, and the IDS is listening to all packets 
> since it works as expected on a plain dumb hub.

Unfortunately, you're looking at the VLAN1 _interface_, not all of vlan 1 (ie. 
traffic to the mgmt address of the switch will be mirrored). AFAIK, there's 
not a way to monitor an entire vlan on a 2900, only individual ports.