Network Monitoring/QOS

Hi guys,

Just reading up on QOS and am wondering, What is the best tool for detecting which interfaces are congested? How can you tell the router doesn't have any more buffer space?Are there any cisco commands that do these tasks (ie detect congested interfaces and lack of buffer space)?

Any help is appreciated. Thanks.

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Comments

redwarrior

You can use pretty much any SNMP-based tool out there to determine bandwidth utilization on an interface. I like to use solarwinds tools simply because that's what we have at work, but there are other freeware/shareware tools like Cacti that can be useful. Netflow-based tools are great for determining what traffic is causing congestion and again, here too, I default to solarwinds simply because that's what I'm familiar with, but I'm certain there are other options.

Met44

Mr.Ping,

There are a few IOS commands to view some limited congestion information. Included in the output of the show interface command is some basic information about the output queue of each interface, such as current output queue size, the maximum size, and the number of dropped packets since the last clearing of counters, in the case of fair queuing. Depending on your queuing strategy, other information may be shown.

Redwarrior has some good advice if you want to get into more meaningful traffic analysis.