6 Replies Latest reply on Oct 31, 2010 10:21 PM by bgrade

NPM Not detecting Recieve and Transmit Bandwitdh correctly for ADSL Circuits

Paul_Yarwood Mar 9, 2010 6:27 AM

Hi All,

I've just noticed something wierd with our implementation of Orion NPM 9.5.1, in that the software is not detecting the transmit and recieve bandwidth values correctly for ADSL Interfaces on devices.

To illustrate we have many routers with an MPLS primary link (with both transmit and recieve bandwidth being synchronous), and an ADSL backup link where typically the recieve bandwidth will be 2mb/s and transmit will be 256kb/s.

When the device is discovered by NPM it has in all instances detected the MPLS interface bandwidths correctly, however with all the ADSL interfaces it has set both transmit and recieve to the lower of the two values (256kb/s in this case).

Is this the expected behaviour or is there a bit of a glitch here? I'm not sure what NPM uses to detect the interface bandwidth, but it doesn't look like it's working it out correctly where the transmit and recieve bandwidths differ.

It's not a particular problem to manually change the bandwidth parameters via SQL / Web Interface, etc but can be a bit time consuming checking everything over and it's never nice to see an alert telling you an interface is at 400% utilisation!

Thanks,

Paul

Re: NPM Not detecting Recieve and Transmit Bandwitdh correctly for ADSL Circuits

MarieB Mar 15, 2010 3:56 PM (in response to Paul_Yarwood)

Hi Paul--
Did this every resolve itself? If so, would you mind posting for the community?
M
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Re: NPM Not detecting Recieve and Transmit Bandwitdh correctly for ADSL Circuits

bshopp Mar 15, 2010 4:34 PM (in response to Paul_Yarwood)

This is what we typically use, do a MIB walk and let us know what you see

OID = ifAlias	1.3.6.1.2.1.31.1.1.1.18.
OID = ifName	1.3.6.1.2.1.31.1.1.1.1.

32bit Counter based

OID = ifInOctets	1.3.6.1.2.1.2.2.1.10.
OID = ifInUcastPkts	1.3.6.1.2.1.2.2.1.11.
OID = ifInNUcastPkts	1.3.6.1.2.1.2.2.1.12.
OID = ifOutOctets	1.3.6.1.2.1.2.2.1.16.
OID = ifOutUcastPkts	1.3.6.1.2.1.2.2.1.17.
OID = ifOutNUcastPkts	1.3.6.1.2.1.2.2.1.18.

64bit Counter based

OID = ifHCInOctets	1.3.6.1.2.1.31.1.1.1.6.
OID = ifHCInUcastPkts	1.3.6.1.2.1.31.1.1.1.7.
OID = ifHCInMulticastPkts	1.3.6.1.2.1.31.1.1.1.8.
OID = ifHCOutOctets	1.3.6.1.2.1.31.1.1.1.10.
OID = ifHCOutUcastPkts	1.3.6.1.2.1.31.1.1.1.11.
OID = ifHCOutMulticastPkts	1.3.6.1.2.1.31.1.1.1.12.

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Re: NPM Not detecting Recieve and Transmit Bandwitdh correctly for ADSL Circuits

Paul_Yarwood Mar 16, 2010 2:08 AM (in response to bshopp)

Thanks Brandon,
I'll give it a try when i can get into the office and post the results.
Many Thanks,
Paul
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- Re: NPM Not detecting Recieve and Transmit Bandwitdh correctly for ADSL Circuits
  
  darryld Mar 16, 2010 12:04 PM (in response to Paul_Yarwood)
  
  The "speed" of the interface is taken from 1.3.6.1.2.1.2.2.1.5 - ifspeed
  There is only one value stored in the mib table and this is used for both the tx and rx bandwidth. A limitation of SNMP so I guess this should be expected.
  
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  - Re: NPM Not detecting Recieve and Transmit Bandwitdh correctly for ADSL Circuits
    
    Paul_Yarwood Mar 18, 2010 2:48 AM (in response to darryld)
    
    I have done a MIB walk on the OID's suggested by bshopp and darryld's comment is spot on, it is only reported on 1.3.6.1.2.1.2.2.1.5 as being 256k, the Mib makes no mention of the higher bandwidth rate on the recieve side, so what NPM is displaying is correct as far as it's what the device is reporting.
    I guess i'll just have to keep manually entering the values.
    Cheers for the information.
    Paul
    
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Re: NPM Not detecting Recieve and Transmit Bandwitdh correctly for ADSL Circuits

bgrade Oct 31, 2010 10:21 PM (in response to Paul_Yarwood)

As the information is contained in the SNMPv2-SMI::transmission MIB (For example 857 router would be SNMPv2-SMI::transmission.94.1.1.5.1.2.12 and SNMPv2-SMI::transmission.94.1.1.4.1.2.12) is there a way to automate the input of these values into the interface speed?
Regards
Tom
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