> The design of LISP explicitly separates the Mapping system from the Itr/EtR.  
> Which means that the "IT Manager configuring xTRs) does not get to define how 
> the mapping system works.

Right, agree, and I didn't say that.

> And if there are undefined variations in how it works for AFI=17, then we 
> have not achieved interoperability.

There isn't. It works exactly like an IPv4 or IPv6 lookup.

> And if there are potential interactions between different uses of AFI=17, 
> then we again have a problem.

There isn't for a given use-case within a given instance-ID. Just like VLANs, 
VRFs, etc. We are not inventing anything new here. We solely want to encode 
ascii strings. 

> If you want to define that AFI-17 is always and only used along with 
> instance-ID, then you solve PART of the problem.  But not all 

Its an EID encoding that can or not go inside an Instance-ID LCAF. And when 
used as an RLOC, there is no instance-ID relationship.

> of it.  If different uses of the AFI clash, then we are creating problems 
> even for a single adminstration using it under a single instance.

IP addresses can clash. We use the same rules for avoiding IP EID clashes as 
AFI=17 clashes. I mentioned this already in a previous email to you.

> And from where I sit, the LISP working group is not chartered to provide a 
> generic string based key-value store.

Look at it this way. Should the IS-IS working group not create hostnames to map 
LSPIDs to names? Allowing this makes it infinitely simpler to manage the 
system. 

This proposal is extremely popular. Ask network operators about IS-IS 
hostnames. This is the same thing. It really is.

Dino

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