Re: [lisp] LISP EID Block Size

Luigi Iannone <ggx@gigix.net> Sun, 03 November 2013 22:52 UTC

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From: Luigi Iannone <ggx@gigix.net>
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Date: Sun, 3 Nov 2013 14:52:29 -0800
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To: Sander Steffann <sander@steffann.nl>
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Cc: Noel Chiappa <jnc@mercury.lcs.mit.edu>, LISP mailing list list <lisp@ietf.org>
Subject: Re: [lisp] LISP EID Block Size
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Hi,

On 31 Oct. 2013, at 09:31 , Sander Steffann <sander@steffann.nl> wrote:

>> I'll explain one experiment and will be crystal ear about it. 
>> 
>> (1) We want to have a LISP site send to both LISP sites and not LISP sites. 
>> (2) We want an ITR to do mapping database lookups when the destination address is an EID. 
>> (3) We want the ITR to forward packet s by doing a traditional FIB lookup when the destination is not an EID. 
> 
> I understand what the technical idea is. There are already EIDs out there (including my own network) that are not in any special prefix. Therefore "address is in special prefix" != "address is an EID”.

That is not correct. With an EID block you would have:

Address in special prefix == address is an EID

Address not in special prefix != is not an EID

Basically if it is n the special block you know it is an EID, if it is not in the special block you have no idea and you have to check.

Luigi


> Unless you break LISP for already existing sites I don't see how having a special prefix is going to help in (correctly) determining whether an address is an EID.
> 
>> Good Zen?
> 
> Sorry, still not (yet?) liking this idea.
> Sander
> 
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