MRTG Graph for Utilization on Cisco 6509 Returns no Data

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sillz 18 years ago

I tried posting in the MRTG mailing list, but I didn't get a response. Are there any MRTG users out there who could help me with graphing the utilization on a Multilinked Interface on a Ciosco 6509. I've been using MRTG for my Cisco switch for a while. All of my other graphs are fine.

I have 4 T1's -- 2 from each provider. The T1's are multilinked, so I have 2 multilinked interfaces on the Cisco box.

The MRTG graph for one multinked interface works fine. The other one returns no data.

Here's the mrtg.cfg

10.1.1.10 is the mgt ip on the cisco 6509.

This one works:

### Interface 10 >> Descr: 'Multilink1' | Name: 'Mu1' | Ip:

66.66.66.66' | Eth: '' ###

Target[10.1.1.10_10]: 10:public@10.1.1.10: SetEnv[10.1.1.10_10]: MRTG_INT_IP="66.66.66.66" MRTG_INT_DESCR="Multilink1" MaxBytes[10.1.10.10_10]: 384000 Unscaled[10.1.1.10_10]: ymwd Title[10.1.1.10_10]: Traffic Analysis for Multilink1 ISP1 -- CORE.mydomain.com PageTop[10.1.1.10_10]: Traffic Analysis for Multilink1 -- CORE.mydomain.com System: CORE.mydomaincom in Server Room Maintainer: me Description: Multilink1 MultiLink to ISP1 ifType: ppp (23) ifName: Mu1 Max Speed: 384.0 kBytes/s Ip: 66.66.66.66()

This one doesn't work:

Target[10.1.1.10_11]: 11:public@10.1.1.10: SetEnv[10.1.1.10_11]: MRTG_INT_IP="77.77.77.77" MRTG_INT_DESCR="Multilink2" MaxBytes[10.1.1.10_11]: 384000 Unscaled[10.1.1.10_11]: ymwd Title[10.1.1.10_11]: Traffic Analysis for Multilink2 ISP2 -- CORE.mydomain.com PageTop[10.1.1.10_11]: Traffic Analysis for Multilink2 ISP2 -- CORE.mydomain.com System: CORE.norcalmutual.com in Server Room Maintainer: me Description: Multilink2 Multi-Link to ISP2 ifType: ppp (23) ifName: Mu2 Max Speed: 384.0 kBytes/s Ip: 77.77.77.77

I get an error in the mrtg.log for the target that returns no data:

2007-11-30 10:29:54 -- 2007-11-30 10:29:52: ERROR: Target[10.1.1.10_11] [_IN_] ' $target->[89]{$mode} ' did not eval into defined data
2007-11-30 10:29:54 -- 2007-11-30 10:29:52: ERROR: Target[10.1.1.10_11] [_OUT_] ' $target->[89]{$mode} ' did not eval into defined data

I know there's trafffic going through the interface from looking at the interface statistics and some perl scripts I have running to check usage.

I set things up by using the MRTG cfgmaker.

Any thoughts would be very appreciated.

Beth

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alexd 18 years ago

Have you tried snmpwalk to see what's happening?

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sillz 18 years ago

Yes, I can do an SNMP walk from the Nagios server just fine.

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sillz 18 years ago

I'm not an MRTG expert. I thought it was using the interface description to get the data:

/root (root) $ snmpwalk -v 2c -c wombatsfpig 10.1.1.10 | grep Multilink IF-MIB::ifDescr.108 = STRING: Multilink1 IF-MIB::ifDescr.109 = STRING: Multilink2

BUT If I comment out these lines in the mrtg.cfg:

#SetEnv[10.1.1.10_10]: MRTG_INT_IP="66.66.66.66" MRTG_INT_DESCR="Multilink1" #SetEnv[10.1.1.10_11]: MRTG_INT_IP="77.77.77.77" MRTG_INT_DESCR="Multilink2"

I get the same results -- 1 works and the other doesn't, so this line doesn't seem to be involved with defining the MIB.

How does MRTG even know what MIB to query?

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Chris 18 years ago

I've always found that when graphing the multilink object it's never been very accurate. So now when I have a multilink circuit to graph I just probe each interface in the multilink group and then add the results together.

Eg, for two physical interfaces (in a multilink group) with indexes 10 and

11

Target[multilink1]: 10:public@10.1.1.10: + 11:public@10.1.1.10:

Chris.

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MRTG Graph for Utilization on Cisco 6509 Returns no Data

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