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From: kbloomfield on 6 May 2008 14:10
Hello,

I have inherited a management system that is barfing on some cisco
72xx and 76xx routers when it finds an ifIndex = 0, rather than
ifIndex =1 or 10.
I gather that ifIndex =0 is not allowed, but I am not sure by who or
what - so I dont know if it is reasonable for the NMS to ignore
ifIndex = 0 or not.
Nor do I know how the indexes got set to 0 in the ist place, nor hwta
the fix might be (to make all indexes 1 or more.
Can someone hep me out?

TIA

Tony
From: Bod43 on 7 May 2008 09:32
On 6 May, 20:10, kbloomfi...(a)yahoo.com wrote:
> Hello,
>
> I have  inherited a management system that is barfing on some cisco
> 72xx and 76xx routers when it finds an ifIndex = 0, rather than
> ifIndex =1 or 10.
> I gather that ifIndex =0 is not allowed, but I am not sure by who or
> what - so I dont know if it is reasonable for the NMS to ignore
> ifIndex = 0 or not.
> Nor do I know how the indexes got set to 0 in the ist place, nor hwta
> the fix might be (to make all indexes 1 or more.
> Can someone hep me out?



As I understand it IF indices are set at boot time
automatically and in principle can be re-calculated
at any time thereafter. e.g. if a card is inserted.

More recent IOS is much better behaved
regarding IF indices and does a better job of
maintaining consistent mapping between
indices and interfaces.

It would be surprising if cisco had done anything that
deviated from the standard. Very surprising.

I don't think that it is possible to manually choose
IF indices.

You can check the IF indices for a device yourself
by using getif.exe and browsing to
.iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifIndex

www.wtcs.org/snmp4tpc/getif.htm
Its old code and has limitations but the basics work well.
Its the only free mib browser that I know of.




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