[c-nsp] Caculatye jitter, delay, packet loss for VoIP using rttMonMIB

[Andreas Bourges]

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Hi,

... for general information on IPSLA see:

http://www.cisco.com/go/ipsla/

There's a IPSLA user guide, which I found very helpful:

http://www.cisco.com/en/US/technologies/tk648/tk362/tk920/technologies_white_paper09186a00802d5efe_ps6602_Products_White_Paper.html


Concerning you questions:

On Thursday 10 April 2008, Wagh, Shivani K (GE, Research, non-ge) wrote:
> I want to calculate jitter,delay,packet loss for VoIP network using
> cisco's RttMonMIB.
> I am not able to pick the exact oid for collecting the data counter.

I'd guess you configured udp-jitter probes? You can use the following subtree
for data retrieval:

Base-OID for Latest-Jitter-probe stats: .1.3.6.1.4.1.9.9.42.1.5.3.1.2

Below this subtree you'll find all available statistics for the udp-jitter
probe,e.g.

Avg-Jitter two-way: .1.3.6.1.4.1.9.9.42.1.5.2.1.46

I'd recommend using a mib-browser and take a look at the
rttMonLatestJitterOperTable.

> I am also not able to understand the Jitter Stats Table,as it gives two
> values.This way.
> cisco.ciscoMgmt.42.1.3.5.1.12.2.4214297322 : Counter: 148
> cisco.ciscoMgmt.42.1.3.5.1.12.2.4214657322 : Counter: 11

What you're looking at here is a history of the latest probe
results, "4214297322" and "4214657322" are the timestamps...

The mib says:

"The Jitter statistics table contains summarized information of
the results for a conceptual RTT control row. A rolling
accumulated history of this information is maintained in a
series of hourly 'group(s)'."

In my opinion, this is only relevant if you're going to monitor probe stats
via router cli. If you poll the probe stats via snmp on a regular base, it's
probably easier to just take a look at the *latest* results (see
above, "rttMonLatestJitterOperTable").


Regards,

Andy


- -- 
Andreas Bourges
CCIE #6947 (R&S,C&S)
GSM: +49 178 7072022
e-mail: andreas.bourges at isarnet.de

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