Means to track congestion/overload

Unanswered Question
Dec 17th, 2007

Hello people!

I have a question:

If i'm a network administrator and one of my departments/users is complaining about slow connection - what commands can i use on the router(and switch too.) to find out clues about congestion or network overload?

How can i investigate it using the router and switch?

Thanks in advance,


I have this problem too.
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Edison Ortiz Mon, 12/17/2007 - 08:27

Check interface counters on each path from source to destination.

The counters will show any errors or high utilization on the link(s).

Start with the ingress port at the access layer (the port where the user is connected to), the move on to the uplink ports to the distribution switch until you reach the destination device.

You may want to isolate if it's an application issue or protocol issue by having the user reach the same device via another protocol or application.

You can also isolate the destination device by having the user reach another device on that same destination subnet.

milkdroogy Tue, 12/18/2007 - 05:18

Thanks - are there any other commands which i can use in order to solve this issue?

shiva_ial Tue, 12/18/2007 - 05:44

Check for speed & duplex mismatch which may also one of the cause

shiva_ial Tue, 12/18/2007 - 05:45

you can also enable ip accounting and check for top talkers

shiva_ial Tue, 12/18/2007 - 21:08

The IP accounting command records the number of bytes

(IP header and data) and packets switched

through the system on a source and destination IP address basis.

Only transit IP traffic is measured and only on an outbound basis;

traffic generated by the router access server or terminating in this

device is not included in the accounting statistics.

Traffic coming from a remote site and transiting through a router is also recorded.

ip accounting -------Enables IP accounting on an interface.

show ip accounting----Displays the active accounting or checkpointed database or displays access list violations.

clear ip accounting---Clears the active or checkpointed database when IP accounting is enabled.


The following example enables IP accounting on Ethernet interface 0:

interface ethernet 0

ip accounting




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