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Remote-query Vs. Manual SNMP polling

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Remote-query Vs. Manual SNMP polling

I was wondering which is the best way to retreive information from a CM whether configuring remote-query or making manual scripts to poll information directly from the CMs.

Does someone know which is the recommended amount of CMs per CMTS you should consider a maximum limit to remote-query for 30 seconds poll intervals?

Any suggestion for modem parameters monitoring?

Thanks in advance

We use both methods (remote

We use both methods (remote-query and direct snmpget)

Firstly, on the CMTS we have remote-query setup for interval 10, and this seems to work fine with 5000 modems on a PRE4. The readouts probably lag 10 to 15 mins behind realtime which isnt too bad.

Cisco recommend you start with the default 30, and then wait and monitor the polling responsiveness. If you need the polling to be faster, then drop the interval a bit. If your load is too high then increase the interval. More info here

Secondly, we have a script that logs into the CMTS every 30 mins and collects all the remote query results (eg show cable modem phy) plus other useful stats, and saves them to a mysql database.

Then we have some web frontend tools that snmpget's live readouts plus also presents historical counts/graphs from MySQL for hit/miss/padj/flap/ussnr/uspwr/dssnr/dspwr/rxpwr etc.

Also, we have other

Also, we have other troubleshooting tools that direct SNMP poll modems.

For example one script will retrieve a list of CM IP from our provisioning system for a given city or node, and then asynchronously snmpget some stats from each modem, and then can plot results onto google maps as colored pins. Results might be as simple as up/down status (to let you spot outages), or other stats like power levels or USSNR so you can look at a map and see clusters where there is signal troubles.

Perl Net::SNMP can poll 5000 modems in just a few seconds!

Thanks Michael

This has been very helpful! You always help me a lot. Thanks for that. I'm a newby in this matter, so any tip will be truly accepted.

Michael, what kind of

Michael, what kind of frontends are you using? home-made, open-source, proprietary?

Thanks in advance!

Its stuff we wrote in-house

Its stuff we wrote in-house

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