[mrtg] Re: Interface reference

[Daniel J McDonald]

Nothing is fool proof.

With the 7206, the interface names will be consistent as long as you don't
change slots.  but, if you move the traffic from one port to another, that
obviously won't work.

You could use IP address, but if you have to re-number then you have to go
through and change everything.  And unnumbered interfaces don't work
terribly well...

You could use ifAlias, but then you need to make certain to update the
descriptions when you make changes.  And you need to remember to remove the
description line from a sub-interface before you delete it, since it will
otherwise still be around even though it is not in the config.

IfIndex is, naturally, the lest useful method, since that can change at
whim.

I personally prefer ifName.  When I move traffic I change it in MRTG.  I
give the targets nice generic names that are associated with ifAlias instead
of ifName.


Daniel J McDonald - CCIE 2495, CNX
Principal Network Specialist
Digicon Technologies
http://www.digicontech.com
dmcdonald at digicontech.com

Digicon - A Cisco Systems Partner, Silver Certified.

> -----Original Message-----
> From: mrtg-bounce at list.ee.ethz.ch
> [mailto:mrtg-bounce at list.ee.ethz.ch]On
> Behalf Of Martinez, Samson
> Sent: Wednesday, February 28, 2001 9:43 AM
> To: MRTG (E-mail)
> Subject: [mrtg] Interface reference
>
>
> This is all personal opinion, obviously, but I'd like to get
> an idea of what
> one would consider to be the most "fool-proof" method of identifying
> interfaces in MRTG, one that would require the least amount
> of config file
> changes should an interface be added/removed from a router,
> etc. If I add an
> additional Ethernet interface to a 7206, for example, will
> the existing
> interface numbers be changed? I can imagine that removing one
> will require
> changes but how about replacing a defective interface?
> Unfortunately, I do
> not have spare devices I can toy around with so any and all info is
> sincerely appreciated.
>
> Regards,
>
> Samson
>
>
>
>
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