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Re: ipv6nd-02.txt & autoconfig

Grenville Armitage <gja@bellcore.com> Thu, 09 May 1996 18:53 UTC

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To: Albert Manfredi <manfredi@engr05.comsys.rockwell.com>
cc: gja@bellcore.com, IP-ATM Working Group <ip-atm@nexen.com>, gja@thumper.bellcore.com
Subject: Re: ipv6nd-02.txt & autoconfig
In-reply-to: Your message of Thu, 09 May 1996 13:16:13 -0700. <3192528D.19E@engr05.comsys.rockwell.com>
Date: Thu, 09 May 1996 14:17:08 -0400
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From: Grenville Armitage <gja@bellcore.com>
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>>Or, alternatively, "All IPv6 communications over ATM SHALL be accomlished
>>over SEL = x (perhaps x = 0)."
>>
>>The objective is exceedingly simple: use the 48-bit ESI _only_ to
>>generate unique IPv6 addresses using autoconfiguration. Do not use SEL.

Such an elegant argument for flattening the NSAPA addressing space
is unexpected. By not allowing the SEL to be used during
call SETUP at the ATM level, you're mandating that different logical
entities layered over a physical ATM NIC _must_ use different ESIs.
A given ATM switch will need to track multiple ESIs and map them to
a single output port when forwarding the SETUP to the end system.
That sounds like flattening a perfectly good hierachy.

gja

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