Re: SNMP reporting wrong max bandwidth

Last I looked, Net-SNMP just guessed at ethernet interface speeds.  It 
used to always guess 10 Mbps, but at some point it started to guess 100 
Mbps.  It does not dynamically detect the speed.  You can change what 
the agent reports by telling the agent the interface speed using the 
"interface" command in the snmpd.conf file.  See "man snmpd.conf". 

>        interface NAME TYPE SPEED
>               For interfaces where the agent fails to guess correctly 
> on the type and speed, this directive can sup-
>               ply additional information.  TYPE is a type value as 
> given in the IANAifType-MIB.
Cheers.




Tim Donnelly wrote:
>
> Hello list,
>
>  
>
> I am using MRTG to monitor the various network devices on my network.  
> Most are correct, hover I am getting some odd results for some 
> servers.  I at first assumed it was an MRTG problem, but after doing 
> some testing, I believe it is really something to do with NET-SNMP.  
> Granted I am out of my depth with this so I could be wrong.
>
>  
>
> The set-up:
>
>  
>
> The server I have MRTG on (Isis) is running OpenSuSE 10.1 x86_64 and 
> net-snmp version 5.3.0.1. 
>
> I have two servers that are misreporting:
>
>                 grdb: running OpenSuSE 10.2 and net-snmp version 5.4.rc2
>
>                 janus: running Suse Enterprise Linux 9 and net-snmp 
> version 5.1.3.1
>
>  
>
> All three are connected via a gig Ethernet switch.
>
>  
>
> The problem:
>
>  
>
> Net-snmp/MRTG reports the max bandwidth of these devices at 
> 100Mb/sec.  In reality they should be seen as 1000Mb/sec.
>
>  
>
> Testing I have done so far:
>
>  
>
> Using ethtool, I have confirmed that the Ethernet interfaces on both 
> servers is indeed operating at 1000Mb/sec.
>
> The switch reports that the ports connected to those servers are 
> operating at 1000Mb/sec.
>
> Manually walking the remote servers from Isis using the command:  
> /snmpwalk -v1 -c public grdb ifSpeed snmpwalk -v2c -c public grdb 
> ifhighspeed/ gives the following output:
>
>                 IF-MIB::ifSpeed.1 = Gauge32: 10000000
>
> IF-MIB::ifSpeed.2 = Gauge32: 100000000
>
> IF-MIB::ifSpeed.3 = Gauge32: 0
>
> IF-MIB::ifSpeed.4 = Gauge32: 0
>
>  
>
> I have been looking for packages to upgrade the version of net-snmp so 
> that it is the same across the board, but I have been unable to locate 
> RPMs for my distro.  I did try to compile from source, but ran into 
> dependency error that, again, did not have packages available for my 
> distro.
>
>  
>
> Can anyone help me?  Either tell me what I am doing wrong, or give me 
> suggestions for more troubleshooting?
>
>  
>
> Thanks
>
>  
>
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