[mrtg] Re[2]: Re: IP unnumbered and ifIndex

[Andres Tong]

     Vivien,
     You are referring to re-running cfgmaker right? If you re-run config 
     maker, does it show you any info on the IpUnnumbered interface? I 
     believe configmaker was originally created to extract router info, so 
     I am usuming it will get SNMP infor from the IpUnnumbered interface?
     
     -andy
     
     
     


______________________________ Reply Separator _________________________________
Subject: Re: [mrtg] Re: IP unnumbered and ifIndex
Author:  Vivien LAM <vivienna at pacific.net.hk> at Internet
Date:    8/12/99 10:23 AM


As the URL I specified below is not hold by me, I don't know why it show 
"Permisison Denied" now.
     
However, I found that the patch shown in the above URL works only on 
Cisco4000 but not Cisco7206.  I need to further investigate how to make it 
work with 7206.
     
Now I have an alternate method in mind.  Whenever I run mrtg, I check 
whether if the ifIndex changed before actually execute the mrtg.  If the 
ifIndex changed, then I generate a new .cfg file.  But I have no time to 
work on this now since another urgent job is on hand.  :(
     
Best Regards,
Vivien Lam
     
On Wed, 11 Aug 1999, Andres Tong wrote: 
> 
>      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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