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Re: (ASCEND) P50, MRTG, and, uh, a problem :)



Well its not so bizarre :)

What happens is that the just as your computer has IP interfaces, like
ppp0, ppp1 for serial ppp interfaces etc, the pipeline has interfaces for
its ISDN port. 

These interfaces are named wan0, wan1, wan2 ... they are essentially
software interfaces - software containers for the accounting information
for the call.

When a call comes up, the pipeline assigns one of these software interfaces
to the call - the next free software interface each time. These map to a
mib-2 interface ... the 'standard' interface table.

Now MRTG looks only at this standard table and not the Ascend 'enterprise'
specific table so when the config file is written, it has to assume that
the current interface will always be valid since there is no concept of
username (connection profile name) or remote IP address etc in the mib-2
tables.

This type of issue is part of the reason for constructing vendor specific
SNMP mibs, and writing NMS systems that understand how individual boxes work.

On a MAX, the usual way to track individual connections is to use the call
and session mibs which give you a pointer to the correct ifIndex for the
session.

There are ways to get around this with MRTG - check the list archives.

cheers,

dean

At 10:52 PM 7/23/98 -0700, Sean Eric Fagan wrote:
>I use MRTG to monitor bandwidth on my p50.  Since I upgraded it's software to
>5.1A, however, I've been having problems with it.
>
>Namely, it stopped reporting *any* bandwidth.  I poked around, and ended up
>rerunning the cfg maker.  And, lo and behold, the interfaces it reported were
>different -- my wan0 went from interface 2 to interface 10.  So I made the
>changes in my cfg file, and it started working.  Yah.
>
>Until a couple of nights ago, when it suddenly went back to 2.  I have made
>*no* changes to the unit in the past couple of weeks; the only thing that
>caused it, as far as I can guess, is a power failure, and when power came
back
>on, the interface was at a different number.
>
>Now, my understandings of MRTG and SNMP is fairly minimal.  But this is
>bizarre.
>
>Anyone know what's going on?
>
>Merci beaucoup, mes amis.

===============================================================
Dean Frye.                      Escalation and Regional Support
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Ascend Asia Pacific        |   /\   |   http://apac.ascend.com/
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