Router Interface Analysers

[chieftan999]

Hi,

We are generating traffic across a 5 subnet WAN in a test environment and each router interface is limited to a 30k bandwidth. We have analysers that can give us bandwidth utilisation and bps throughput, but we need an analyser that can see where packets are being dropped (if any) and Latency from source to destination.

Has anyone got any ideas on this?

Thanks

 

[NetEng631]

You can use an Ixia or Adtech for latency but for where the packet is being dropped you would have to look into the counters on the switch. If you wanted to you could develop some scripts to poll the SNMP counters and then sort them from there.

 

[Narizz28]

You can also use MRTG to monitor any SNMP OID in a historical graph. Just replace the default with the OID you want.

To find the OID, or if you just want a "point in time" count, use GetIf to walk the OID tree and poll the one you want.

 

[computerhighguy]

The only issue with MRTG is that it is made only for pollinng every 5 minutes. But its a great tool at a great price (FREE!!). I would suggest looking at the counters. But better yet, get a copy of something like What's up gold. It's cheap and it works great. Then you could poll the routers (via SNMP) for the information as often as you like.

 

[redzone]

Set it up as a cron job to run every minute, if 5 mins is too long...

Simon

 

[computerhighguy]

It has nothing to do with the a scheduler. It has to do with the structure of the database and the way it stores data. In addition, the way MRTG does it averaging a graphs it is only suitable (and designed) for every 5 minutes.


It is what it is!!
__________________________________
A+, Net+, I-Net+, Certified Web Master, MCP, MCSA, MCSE, CCNA, CCDA, and few others (I got bored one day)

 

[redzone]

Agreed, it is only designed for 5mins but does work every minute..

I never use the "Interval" option and should have mentioned that I use the rrdtool.. Sorry for confusion.

QUOTE
Example:

Interval: 10

Note that unless you are using rrdtool you can not set Interval to less than 5 minutes. If you are using rrdtool you can set interval down to 1 minute. Note though, setting the Interval for an rrdtool/mrtg setup will influence the initial creation of the database. If you change the interval later, all existing databases will remain at the resolution they were initially created with.

UNQUOTE

 

[chieftan999]

Thanks guys. I will give these options a go.

Again...Thanks for the advice