How to - Network Sniffer on Catalyst 2950

bryceiu · ‎02-06-2004

I know that for some time you could not place a sniffer or any type of packet filtering device on a 2950 without a hub in between. I have heard that with the a newer IOS this is possible to sniff the LAN without a hub in the middle. If so, what is the proper config to do it. Thanks.

mvoight · ‎02-09-2004

Brandon,

The following documenat liks describes configuring SPAN on a 2950.

http://www.cisco.com/en/US/products/hw/switches/ps628/products_configuration_guide_chapter09186a00800d84c5.html

Michael Voight

CSE, Cisco TAC

bryceiu · ‎02-09-2004

Thank you for responding. I found the docs today and tested a sniffer using the monitor session commands and it works like a charm. Was this fix applied in IOS 12.1.13?? thanks again.

mvoight · ‎02-10-2004

Brandon,

The feature navigator is a good tool for finding out what features are in a specific version. http://www.cisco.com/go/fn

According to this, Switch Port Analyzer (SPAN) for the CAT2950, the image with the lowest version number showing is

c2950-i6q4l2-mz.12.1-11.EA1

Michael

mvoight · ‎02-12-2004

Brian,

Feature navigator is a good tool to find what features are located in what versions.

http://www.cisco.com/go/fn

According to this, it looks like Switcfound in:h Port Analyzer (SPAN) on the CAT2950 as early as 12.1(11)EA1

Michael