UBR7246VRX give wrong data over SNMP

[stian.seland.olsen]

Hi,

Have a few UBR7246VRX CMTS routers running Version 12.2(33)SCE2.

It seems that I have a problem regarding Docsis 3.0 modems and SNMP output from the CMTS.

My managment-system (with a mrtg lookalike function) is collecting data from the CMTS every few minuts collecting data regarding data in downstream and upstream, total of modems and so on.

The problem I have seen is that the CMTS is not giving me the correct data when a ED3.0 modem is downloading or uploading.

E.g:

ED3.0 downloading with a speed of 100mbps:

snmpwalk -c COMMUNITY HOST -v 2c  .1.3.6.1.2.1.31.1.1.1.10.1025

IF-MIB::ifHCOutOctets.1025 = Counter64: 3299718

ED2.0 downloading with a speed of 8mbps:

snmpwalk -c COMMUNITY HOST -v 2c  .1.3.6.1.2.1.31.1.1.1.10.1025

IF-MIB::ifHCOutOctets.1025 = Counter64: 8266933

All CM is disconnected:

snmpwalk -c COMMUNITY HOST -v 2c  .1.3.6.1.2.1.31.1.1.1.10.1025

IF-MIB::ifHCOutOctets.1025 = Counter64: 3282662

This is the Cable 4/0 interface.

Anybody seen this issue before?

[Chieh Yu]

Hi Stian,

I just looked over some case histories and there was one other customer with something similar.

Are you polling the wideband-cable interface for your throughput counters? Because the interface wideband-cable would be the correct interface to poll for total D3.0 thruput through a bonding group and not an individual interface such as a integrated-cable.

e.g. is ifDescr.1025 an interface integrated-cable or is it a wideband-cable?

Hope that helps,

Jack