Problems Using Port Spanning on Cisco 3550
Posted on 2005-05-06
I have purchased a copy of Network Instruments Observer suite, but am having problems with my port spanning on my Catalyst 3550.
Here's my set up.
In the server room, we have a 24 Port Catalyst 3550 which is our core switch, all the servers and other switches are linked through this one.
I have a cable patched into Port 1 on the switch to my machine down here, which has a Network Instruments PCMCIA card in (promiscuous)
If want to port span one of the ports to monitor it and send the traffic through to this port I am entering the following (Port 16 is the example in this)
CATALYST_9(config)#monitor session 1 source interface Fa0/16
CATALYST_9(config)#monitor session 1 destination interface Fa0/1
CATALYST_9#show monitor session 1
Type : Local Session
Source Ports :
Both : Fa0/16
Destination Ports : Fa0/1
Encapsulation : Native
So all looks OK, but as soon as I make these changes, it effectively disables the PCMCIA card connection that is plugged into Port 1
How do I stop this? I can't even ping anything, to get my connection back I have to hyperterminal in from another machine and remove the monitor ports.