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Re: [CCAMP] Comment on compatibility in draft-takacs-ccamp-revertive-ps

"Zafar Ali (zali)" <zali@cisco.com> Fri, 08 November 2013 21:11 UTC

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From: "Zafar Ali (zali)" <zali@cisco.com>
To: Lou Berger <lberger@labn.net>, CCAMP <ccamp@ietf.org>
Thread-Topic: Comment on compatibility in draft-takacs-ccamp-revertive-ps
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Date: Fri, 08 Nov 2013 21:11:04 +0000
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Subject: Re: [CCAMP] Comment on compatibility in draft-takacs-ccamp-revertive-ps
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Hi Lou- 

You are right, the ctype is TBD, like I mentioned during the meeting that
we are using different ctype.

We would like to take this opportunity to solicit comments from the WG on
this draft. 

Thanks

Regards Š Zafar

-----Original Message-----
From: "lberger@labn.net" <lberger@labn.net>
Date: Thursday, November 7, 2013 6:17 PM
To: zali <zali@cisco.com>, "ccamp@ietf.org" <ccamp@ietf.org>
Subject: Comment on compatibility in draft-takacs-ccamp-revertive-ps

>Zafar,
>	My comment in today's session was that you are redefining the format of
>an existing object (by adding TLVs) this breaks compatibility.  You
>stated that this wasn't the case.
>
>FWIW:
>
>Your document says:
>
>    0                   1                   2                   3
>    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>   |            Length             | Class-Num(37) |   C-Type(2)   |
>   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>   |S|P|N|O| Reserved  | LSP Flags |      Reserved     | Link Flags|
>   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>   |I|R|   Reserved    | Seg.Flags |           Reserved            |
>   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>   |                                                               |
>   ~                           sub-TLVs                            ~
>   |                                                               |
>   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
>
>RFC4872 says
>      0                   1                   2                   3
>      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     |            Length             | Class-Num(37) | C-Type (2)    |
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     |S|P|N|O| Reserved  | LSP Flags |     Reserved      | Link Flags|
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     |                           Reserved                            |
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
>Perhaps you meant C-Type(TBD).  You should address compatibility
>explicitly in any case.
>
>Lou

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