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Re: [trill] Fwd: Mail regarding draft-ietf-trill-over-ip

"Templin, Fred L" <Fred.L.Templin@boeing.com> Tue, 05 May 2015 16:47 UTC

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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: Joe Touch <touch@isi.edu>, Xuxiaohu <xuxiaohu@huawei.com>, Donald Eastlake <d3e3e3@gmail.com>, "trill@ietf.org" <trill@ietf.org>
Thread-Topic: [trill] Fwd: Mail regarding draft-ietf-trill-over-ip
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Date: Tue, 05 May 2015 16:39:39 +0000
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Subject: Re: [trill] Fwd: Mail regarding draft-ietf-trill-over-ip
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Hi Joe,

> -----Original Message-----
> From: Joe Touch [mailto:touch@isi.edu]
> Sent: Tuesday, May 05, 2015 9:35 AM
> To: Templin, Fred L; Xuxiaohu; Donald Eastlake; trill@ietf.org
> Cc: nvo3@ietf.org; int-area@ietf.org; sfc@ietf.org
> Subject: Re: [trill] Fwd: Mail regarding draft-ietf-trill-over-ip
> 
> 
> 
> On 5/5/2015 7:54 AM, Templin, Fred L wrote:
> > I thought we determined the IP-in-UDP is just GUE with header compression?
> 
> IP in UDP adds only port numbers and an Internet checksum.
> 
> That doesn't address fragmentation; if outer fragmentation is assumed,
> IPv4 needs to be rate-limited to avoid ID collisions and the Internet
> checksum is insufficient to correct those collisions.

Right - that is why we have GUE. But, when these functions are not
needed GUE can perform header compression and the result looks
exactly like IP in UDP.

Thanks - Fred
fred.l.templin@boeing.com

> Joe

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