Diagnosing backbone traffic/congestion on LAN

Unanswered Question
Apr 15th, 2009
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Hi All,


If you were wating to see how much traffic/congestion was on your enterprise (L3) LAN backbone what are some good ways to do this. I know you can use the usual tools like wireshark, solarwinds, etc... Just curious as some methods used.


Thanks,

Brandon

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Giuseppe Larosa Wed, 04/15/2009 - 04:58
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Hello Brandon,

you can have nice graphs of MIB variables like ifinoctets ifoutctets drawn by MRTG with a reference line = link speed


it provides graphs in a daily, weekly, mounthly basis so it gives both a baseline and growth trends


see


http://oss.oetiker.ch/mrtg/


So you can trace link usages on all devices and navigate on web pages


Hope to help

Giuseppe


Giuseppe Larosa Wed, 04/15/2009 - 05:07
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Hello Brandon,

I think they are similar


both use the

RRDTool's data storage and graphing functionality.


So by having a look at the graphs you could have a vision of link usage over time.


Probably you can also try to create events on devices that send traps when link usage is above a threshold.

This can be a different approach with devices playing an active role but requires additional configuration.


see for example EEM embedded event manager


http://www.cisco.com/en/US/docs/ios/netmgmt/configuration/guide/nm_eem_overview_ps6017_TSD_Products_Configuration_Guide_Chapter.html#wp1064328



Hope to help

Giuseppe



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