Solved

How does a Cisco switch calculate interface utilization

Posted on 2011-03-25
2
1,461 Views
Last Modified: 2012-05-11
Hello everyone,
I have a question about monitoring switchports. I am working with Cisco 3560 switches. but, I would suspect this would apply to all Cisco Switches and routers.

I have used various snmp monitoring tools. Currently I am using Cisco NetManager and Cisco Network Assistant. These tools display the interface utilization of a giving interface. However, it does it in percentages. So, my question is, how does it calculate that value?

Specifically, I have a gigabit interface that is running at 100mbps (becuase it's connected to a 100mbps device) and the switch is telling me that the interface is at %10 utilization, is that %10 of 1Gbps or %10 of 100Mbps?

Does the bandwidth command on the interface affect this calculation?

Thanks!
0
Comment
Question by:Jack5Back
2 Comments
 
LVL 45

Accepted Solution

by:
Craig Beck earned 250 total points
ID: 35216881
The bandwidth command only affects routing decisions.

I believe that the percentage displayed is that of whatever the interface is working at - so if the port negotiates 100Mbps, it will display 50% at 50Mbps.
0
 
LVL 16

Expert Comment

by:memo_tnt
ID: 35219018
Hi

check the following link, how to calculate utilization

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a008009496e.shtml

0

Featured Post

Free Trending Threat Insights Every Day

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

Join & Write a Comment

Suggested Solutions

Title # Comments Views Activity
Windows 10 nic replacing assing ip address 6 39
Cisco ACS TACACS 2 38
KVM switch 7 24
stacking switches 2 23
When posting a question about a Cisco ASA, Cisco Router or Cisco Switch, it can aid diagnosis if a suitably sanitised copy of the config is provided. It is much better to leave as much of the configuration as original as possible, as it could be tha…
This tutorial will go through the steps required to write a script that will back up the configuration settings of a HP-ProCurve switch. You will need to get the following things to follow this tutorial: Telnet Scripting Tool e.g. TST10.exe …
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now