How to configure catylst 2960?

Unanswered Question
Mar 17th, 2010
User Badges:
  • Cisco Employee,

Hi, All:

I'm trying to capture packets running between router1 and router2. I used a catylst 2960 to connect to router1 and router2, and use another port to connect to my laptop ethernet port.
What should I configure in order to see all the traffic between router1 and router2 on my laptop?

I tried with ping from router1 to router2, but I guess the packets just go directly to router2, and my laptop does not capture anything.

Do I need to configure anything on the cat2960 switch for the 3 ports in order for the packets to flood over each port that my laptop can capture all the packets?


  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
KARUPPUCHAMY MA... Wed, 03/17/2010 - 18:27
User Badges:
  • Silver, 250 points or more


You can configure Local SPAN in your 2950 switch  and install ethereal or wireshark in your laptop.Then you can capture  the traffic between router 1 and router2.

sample  configuration:

C2950(config)#monitor session 1 source interface fastethernet 0/2 (you  can add more interfaces)
C2950(config)#monitor session 1 destination interface fastethernet 0/3  (your laptop should connect this port)

For  more informatiom just have a look ino the below URL




This Discussion