Sniffing on Catalyst 3548 1

[kernow]

Hi all,

I'm looking for the command to enable a port to be used to sniff cross VLAN on a Catalyst 3548 switch.
I have had no luck on the Cisco website and can't find anything through either newsgroups or Google....

Thanks in advance.

 

[baddos]

Did you try port monitor vlan1?

 

[kernow]

Hi - yeah we've tried going into the interface we're patched in to and using "port monitor fa0/3" for example where 3 is the port we want to monitor.
No joy using Sniffer Pro though.

 

[krr]

Monitoring port vlan1 just gives you the management traffic for the switch, because interface vlan1 is the management interface which also holds the ip address of the switch.

There is no easy way (that I know of ;-)) to monitor a whole vlan. But you can configure multiple [tt]port monitor fa0/x[/tt] statements, so that you can monitor all ports in vlan 1. A simple 8tt9no port monitor[/tt] will remove them all.

Cheers *Rob

 

[gaveeve]

Hi, Here is a link to SPAN (Switched Port Analyzer) and the different variations needed for different versions of equipment.

http://www.cisco.com/warp/public/473/41.html

hope this helps.

 

[krr]

Thanks for the pointer. Sometimes life can be so easy... just [tt]port monitor[/tt] cool!

Cheers *Rob