SNMP-Variables not available (anymore?)

In article , Peter Guhl wrote: :We have got a Cisco 4006. Some time ago the mrtg-statistics stopped to work. :It's asking for OID 1.3.6.1.2.1.2.2.1.10.1, 1.3.6.1.2.1.2.2.1.10.2, :1.3.6.1.2.1.2.2.1.10.3 etc. but after .2 it gets "noSuchName" back. :Checking manually with snmpget gave me the same result. .1 and .2 return :some values, .3, .4 etc. return the error.

Is it possible that the interfaces got internally renumbered, so that now the third interface is not .3 but something else? That could happen if snmp ifindex persist got lost.

The interface list can be read off by walking .1.3.6.1.2.1.2.2.1.1

I had a bit of trouble find that OID (probably something I did wrong) but snmptable with the OID 1.3.6.1.2.1.2.2 got me the clue that it's indeed a renumbering. ifIndex goes "1, 2, 201, 202,

Many thanks for the tip! I had it in front of my eyes but didn't see it ;)

Any idea how this renumbering (or that snmp ifindex persist getting lost) could have happened? Something during the password recovery procedure? I would like to avoid that in the future - if possible...

Regards Peter

If your have snmp ifindex persist turned off (the default), a reboot can renumber interface IDs. If you have it turned on, reboots generally have been pretty stable at keeping the same interface IDs. IOS upgrades have not :(

I just heard that somebody added some blades with new ports around that time too... I guess that's not only a reboot but also a rather good cause for a ID-renumbering...

Regards Peter