[mrtg] Re: IP unnumbered and ifIndex

[Andres Tong]

     Vivien,
     So what is your solution for Ip Unnumbered? We have a cisco router 
     here whose Serial interface in IPUnnumbered (using E0) and I want to 
     monitor the utilization on that. When I go to your specified 
     site:
     
     http://www.ulg.ac.be/~pirard/Cisco/
     
     I get permission denied.
     
     
     I would appreciate if you can clarify your resolution, or point me to 
     a resource.  Thanks.
     
     Andres A. Tong
     Sr. Technical Analyst/Network Engineer
     Judicial Council of California- San Francisco
     andres_tong at jud.ca.gov
     
     


______________________________ Reply Separator _________________________________
Subject: [mrtg] Re: IP unnumbered and ifIndex
Author:  Vivien LAM <vivienna at pacific.net.hk> at Internet
Date:    8/4/99 7:07 PM


On Wed, 4 Aug 1999, Alan J. Flavell wrote: 
> 
> On Wed, 4 Aug 1999, Vivien LAM wrote: 
> 
> > I have problem on using MRTG to monitor the interfaces on some Cisco 
> > routers which use "IP unnumbered" on the interfaces.
> > 
> > As stated in the "config.txt" of v2.8.6:
> >      * Sometimes SNMP interface index can change, like when new
> >        interfaces are added or removed. This can cause all Target entries 
> >        in your config file to become wrong by offset, causing MRTG to
> >        graphs wrong instances etc.  MRTG supports IP address instead of 
> >        ifindex in target definition....
> > 
> > However, since the routers I wanted to monitor is using "IP unnumbered" on 
> > the interface and also the ifIndex will also be changed, it's likely that 
> > there is no way for mrtg to take a "index" to recognize the interface when 
> > it execute.
> > 
> > Any solution and suggstion?  
> 
> The only solution seems to be: don't use that option.  On the basis of 
> what you said, it clearly cannot work.
     
Thanks for your advice.
     
> How about the -d option instead?  
     
In my understanding, -d option only change the word in "Target[XXXX]" but 
not those after "Target[]" which is used in the SNMP part.
     
In the website: http://www.ulg.ac.be/~pirard/Cisco/, a solution is 
provided.  It patched the original mrtg and do not use "ifIndex" but 
"ifDescr" for the indexing.  I have just tried it and it works fine.  :)
     
Regards,
Vivien Lam
Pacific Supernet Ltd.
     
     
     
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