Span port on switch?

Unanswered Question
Nov 4th, 2007
User Badges:


I need to monitor traffic on a port on a Cisco 2950 Catalyst switch, I think I need to use the Span option, if so how? Also does it impact cpu/memory on the switch if I have more than one?

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Richard Burts Sun, 11/04/2007 - 03:39
User Badges:
  • Super Silver, 17500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN


The SPAN function (called the monitor function in some switches) will copy traffic to or from a port (or several ports) on the switch and send the copy to another port on the switch. You would need to connect something to that port to do the monitoring. Frequently people connect a PC to the port and run a packet capture software on the PC such as Wireshark (used to be Ethereal) or Sniffer, or some such software.

Catalyst switches can support 2 SPAN/monitor ports. As far as I know there is minimal impact in the switch to run SPAN.




This Discussion