10-30-2011 12:00 PM - edited 03-07-2019 03:07 AM
Hi All,
I read quite a few documents on configuring SPAN on a cisco switch but none of them mention any limitations or any kind of CPU load it can have on a switch. I need to configure this on one of our switches and would like to know if there are any implications related to SPAN.
Regards
10-30-2011 12:20 PM
Hi,
If you are running IOS 12.2(19) or later release, you can monitor the CPU to see if there is any impact when SPAN is turned on.
Have a look at this doc:
http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml#tools
HTH
10-30-2011 11:19 PM
Hi Reza,
I actually do not want to reach to that stage where after turning on SPAN I run into CPU issues hence I wanted to know if there are any issues with SPAN.
I have used SPAN earlier in production networks but the network where I configured SPAN was not huge enough. The current network has lots of VLAN and traffic passing across so I am kinda skeptical.
Regards
11-03-2011 05:17 PM
From my own experience I've tried span on a 4500 and 6500 for a complete VLANs and it was fine I even have IPSs running in promiscuous mode witch requires SPAN and it's working fine.
so, have no fear
---
Posted by WebUser Ahmed Rasmy
11-02-2012 12:45 AM
I'm asking myself the same question, how SPAN can load the CPU, in particular if you monitor more 10G port on a 4500. Do you have a feedback about issue above ?
11-02-2012 08:52 AM
Your best bet would be to turn span on and keep a close eye on your CPU levels.
Sent from Cisco Technical Support iPad App
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide