[c-nsp] Re: Graphing multiple PVC's on multipoint ATM subinterface?

[Roger Weeks]

We have a different setup on our ATM than you, because we're using  
RBE and not PPPoE, and our interface is point-to-point, but I have no  
problems graphing these customers with our old MRTG software.  I  
never had any problems with cfgmaker not recognizing ATM  
subinterfaces at all.  Here's a sample config for one of our PVC ranges:

interface ATM2/0.4200 point-to-point
description DHCP ADSL Users PVC 4/200 to 4/206
ip unnumbered Loopback1
ip helper-address x.x.x.x
ip flow ingress
no ip mroute-cache
atm route-bridged ip
range pvc 4/200 4/203
   class-range classADSL
!
end

I used this script to call cfgmaker:

#! /bin/sh
/usr/local/mrtg-2/bin/cfgmaker \
         --global 'WorkDir: /var/www/graphs' \
         --global "Logformat: rrdtool" \
         --global 'Options[_]: growright,bits' \
         --global 'PathAdd: /usr/local/rrdtool/bin/' \
         --global 'LibAdd: /usr/local/rrdtool/lib/perl/' \
         --ifdesc=descr \
         --ifref=descr \
         public at router.foo.com > /var/mrtg/cfg/router.foo.cfg

You need to make sure that the ifdesc and ifref fields pull something  
that is unique to the interface.  If you're doing --ifref=ip that  
might be a problem if those PVCs are using IP unnumbered (for  
example) because MRTG will see all of the interfaces as having the IP  
of the loopback, and will only use a single interface and comment all  
the others out.

Secondly, if you have a lot of customers and you want graphs for  
every PVC, and you want to be able to group them, say by city, or by  
PVC range, MRTG is going to be problematic - at least I never had any  
luck with it.

We migrated to using Cacti - http://www.cacti.net - and I am really  
happy with it.  It stores all data in a mysql backend, it's  
configurable 6 ways from sunday, and it allows me to group my  
subinterfaces arbitrarily.

--
Roger J. Weeks
Systems & Network Administrator
Mendocino Community Network
Now offering DSL in Northern California


On May 4, 2005, at 11:14 AM, cisco-nsp-request at puck.nether.net wrote:

> Message: 7
> Date: Wed, 04 May 2005 13:40:37 -0400
> From: Vinny Abello <vinny at tellurian.com>
> Subject: [c-nsp] Graphing multiple PVC's on multipoint ATM
>     subinterface?
> To: cisco-nsp at puck.nether.net
> Message-ID: <6.2.3.0.2.20050504133609.0769a5d0 at pop3.tellurian.com>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
>
> Hello all,
>
> I'm wondering if there is a way to graph individual PVC's on a
> multipoint ATM subinterface that is using the pvc range command. We
> have this setup for aggregating DSL customers. For example:
>
> interface ATM1/0.1 multipoint
>   range pvc 1/301 1/360
>    ubr 10000
>    encapsulation aal5snap
>    protocol pppoe
>
> Using a tool like MRTG's configmaker, we get configs for just the
> subinterface to be graphed which shows us a combined total of
> bandwidth for all PVC's on that subinterface specified by the range
> command. I'd like to see actual usage on each PVC if possible. Does
> anyone know if this can be done by polling a specific OID which
> relates to each PVC or would it have to be broken down into
> individual subinterfaces with one PVC per subinterface?
>
> Thanks in advance!
>
> Vinny Abello
> Network Engineer
> Server Management
> vinny at tellurian.com
>