[openib-general] Re: IP addressing on InfiniBand networks (Caitlin Bestler)
bill at strahm.net
Wed Jun 29 22:39:10 PDT 2005
>Date: Wed, 29 Jun 2005 09:00:37 -0700
>From: Roland Dreier <rolandd at cisco.com>
>Subject: Re: [openib-general] IP addressing on InfiniBand networks
>To: Caitlin Bestler <caitlin.bestler at gmail.com>
>Cc: "Lentini, James" <James.Lentini at netapp.com>, Christoph Hellwig
> <hch at lst.de>, openib-general <openib-general at openib.org>
>Message-ID: <5264vxi256.fsf at topspin.com>
>Content-Type: text/plain; charset=us-ascii
> Caitlin> An assigned GID meets all of the requirements for an IA
> Caitlin> Address. I think taking advantage of that existing
> Caitlin> capability is just one of many options that can be done
> Caitlin> by the IB CM rather than forcing IB specific changes up
> Caitlin> to the application layer.
>Just to be clear, the IBA spec is very clear that a GID _is_ an IPv6 address.
> - R.
Just to be REALLY clear - IANA has not allocated IPv6 address space to
any Infiniband entities - so they are not Internet IPv6 addresses. GIDs
are formatted like IPv6 addresses but in no sense should EVER be used at
an IP layer 3 address.
From an IPoIB stance - IB is just a very over engineered Layer 2 that
has a singularly large MAC address.
From an IB ULP point of view - how you get to the layer 2 address that
is needed to perform communications that do not include IP, it isn't a
problem - but let me tell you.... The leadership of the IETF is scared
of IB because of saying things IB GIDs _ARE_ IPv6 addresses.
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