Re: [lisp] [Ila] LISP for ILA

"Alberto Rodriguez Natal (natal)" <natal@cisco.com> Tue, 13 March 2018 20:53 UTC

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From: "Alberto Rodriguez Natal (natal)" <natal@cisco.com>
To: Dino Farinacci <farinacci@gmail.com>
CC: Tom Herbert <tom@quantonium.net>, "Fabio Maino (fmaino)" <fmaino@cisco.com>, "ila@ietf.org" <ila@ietf.org>, "lisp@ietf.org" <lisp@ietf.org>, Albert Cabellos <acabello@ac.upc.edu>, "Vina Ermagan (vermagan)" <vermagan@cisco.com>
Thread-Topic: [Ila] LISP for ILA
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Date: Tue, 13 Mar 2018 20:53:29 +0000
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Subject: Re: [lisp] [Ila] LISP for ILA
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´╗┐On 3/13/18, 12:56 PM, "Dino Farinacci" <farinacci@gmail.com> wrote:

    > Using IPv6 format is something we considered while writing the draft. We went the LCAF route to have an explicit way to (1) distinguish ILA Identifiers/Locators from other addresses in the Mapping System, (2) specify the Identifier/Locator length and (3) include metadata bits. However, for simple scenarios (only ILA domain, no overlapping with non-local addresses, no multiple SIR prefixes, fixed Identifier length, no need for metadata bits, etc) things could work with AFI=2 format. If the rough consensus from the WG(s) is that a plain AFI=2 format is sufficient, we can certainly update the draft. I would like to know the opinion of others on this. 
    
    Well identifiers can be encoded as ::<64-bits> and locators can be encoded as a regular prefix (leading bits and mask-length).
    
    I have been running with some ILA addresses in my mapping system for a while now. I wanted to show Tom that it could be done easily. What I did was register a 128-bit EID which was the SIR-prefix plus identifier which mapped to a 128-bit RLOC that contained high-order bits as the routable locator and low-order bits as the identifier. I realize this is a bit redundant, but it could be done with no protocol or implementation changes.

There is another option that we discussed when we were considering IPv6 encoding. Instead of being redundant with the low-order bits of the Locator, you could use those to encode a "special identifier" that you will use when sending control-plane messages to that Locator. This way, the ILA device at that Locator has a clear way to punt packets to control-plane processing.

Alberto