ifindex interface persist

Unanswered Question
Feb 28th, 2007

Is this command really necessary? I do remember the days that NMSs would use the ifindex number to label interfaces, and in a modular chassis keeping track of which index was which interface was a real pain in the ass. It seem like most NMS these days use the interface identifier (fa0/0, s0/0 etc) to label interfaces so if/when the index # changes it doesn't really matter.

General thoughts on the utility of this command?

I have this problem too.
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Joe Clarke Wed, 02/28/2007 - 12:30

Like you say, it really depends on the NMS in question as to whether or not it's really NEEDED. For example, MRTG has the flexibility to use any kind of unique identifier to track interfaces, so ifIndex persistence is not needed for it. However, to be completely compatible with all potential NMSes, it doesn't hurt to enable it. It will just take up a few extra bytes in protected NVRAM.

jdevoll Thu, 03/01/2007 - 12:53


That is a really good point.

Thank you for the input.



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