Getting SNMP IfIndex for already renamed interfaces

Getting SNMP IfIndex for already renamed interfaces

Hi,

In our Netflow implementation, we have several routers that we recently upgraded to newer models (Cisco). This changed all the IFIndexes, so our previously named (renamed in netflow) interfaces no longer match up with what they are supposed to. Is there a way to find out what IFIndex Netflow is using for a managed interface that was already renamed to something other than its original ifindex?

I.E.

I see IFIndex6

I rename IFIndex6 to Port123

4 years later that router is replaced, and now I need to update descriptions, but I don't know/remember what IFindex Port123 was before I renamed it, and I need that information to rename it correctly. 
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