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Re: Updated IID length text

Suresh Krishnan <suresh.krishnan@ericsson.com> Fri, 20 January 2017 04:08 UTC

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From: Suresh Krishnan <suresh.krishnan@ericsson.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Subject: Re: Updated IID length text
Thread-Topic: Updated IID length text
Thread-Index: AQHScexTEphs/8uw7UCjlzAHkgGpaKE/bE4AgAACpICAAAf0gIABERyAgACNnwA=
Date: Fri, 20 Jan 2017 04:08:17 +0000
Message-ID: <453DEC8C-F825-40E3-8F7F-EFDEF372C4FD@ericsson.com>
References: <148406593094.22166.2894840062954191477.idtracker@ietfa.amsl.com> <F6953234-3F85-4E28-9861-433ADD01A490@gmail.com> <m2wpdzhncn.wl-randy@psg.com> <82245ef2-cd34-9bd6-c04e-f262e285f983@gmail.com> <m2d1frhjfn.wl-randy@psg.com> <18e6e13c-e605-48ff-4906-2d5531624d64@gmail.com> <CAKD1Yr1cvZ8Y3+bHeML=Xwqr+YgDspZGnZi=jqQj4qe2kMc4zw@mail.gmail.com> <m2lguffnco.wl-randy@psg.com> <CAKD1Yr1TrTiPRdyutobmb_77XJ7guNzLrg=H_p7qi4BfQ8V=GA@mail.gmail.com> <m2d1frfm6m.wl-randy@psg.com> <CAKD1Yr2Njjd8_Mr+6TRFF6C5pdcX4yFgpFVyEkykDuytu2B8mg@mail.gmail.com> <2A5073777007277764473D78@PSB> <4596c3d4-a337-f08e-7909-f14270b7085f@gmail.com> <CAN-Dau06R3iYRpYLADhvHox4C9qdsJCuxFsJapRhOQcWT4qk_g@mail.gmail.com> <CAO42Z2weZcoHiBzN94QAQ9WGhWR16PmMMFNg=5YLmr_dhPjjpA@mail.gmail.com> <fcc7f136-b5da-527e-b495-5a2d7f7a3ce8@gmail.com> <55bb8bdbfbf4439da0aa702e5bc03e2c@XCH15-06-11.nw.nos.boeing.com> <bb79ce41f2cc465dab0a7f26466be26f@XCH15-06-11.nw.nos.boeing.com> <ed9fe2df-0dce-0ddc-bdee-561217d089bb@gmail.com> <e8b4d426-55b4-bd2e-ea4f-f8e56e831d44@gmail.com>
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Hi Brian,

> However, correct use of Stateless Address Autoconfiguration
>   (SLAAC)[RFC4862] requires all interfaces on a link to use the same length
>   of Interface ID.

I don’t think this is true. SLAAC only requires that the prefix length and IID length add up to 128. So, we can advertise different prefixes (with different lengths) on a link to support different IID lengths. We never did because both the prefix length and the IID length have been 64 bit long in the most prevalent cases.

Thanks
Suresh

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