Re: [Pce] Update in ID: draft-dhody-pce-pcep-domain-sequence

Zhangfatai <zhangfatai@huawei.com> Fri, 21 October 2011 03:55 UTC

Date: Fri, 21 Oct 2011 03:55:00 +0000
From: Zhangfatai <zhangfatai@huawei.com>
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To: Dhruv Dhody <dhruv.dhody@huawei.com>, "pce@ietf.org" <pce@ietf.org>
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Subject: Re: [Pce] Update in ID: draft-dhody-pce-pcep-domain-sequence
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Hi Dhruv and all,

You may notice the mail from Ramon about [HPCE- PCEP-EXT], which raised a point about the format of the Domain-ID TLV. We also put a editors’ note in section 3.1.3 to capture this issue.

In [HPCE- PCEP-EXT] draft, we defined the Domain-ID TLV which has the same format as PCE-DOMAIN sub-TLV format defined in RFC5088, but we did not notice that the length of  ISIS area ID should be variable. So, we need to refine the format as follows at least (just my suggestions):



    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

   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   |           Domain Type         |            Reserved           |

   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   //                       Domain ID                              //

   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



  Type=1: an AS number (4 bytes)

  Type=2: OSPF area ID (4 bytes)

  Type=3: ISIS area ID, the length is variable

Note that this Domain-ID TLV can be included in many PCEP objects like OPEN, NOTIFICATION, RP objects.

As for [draft-dhody], the sub-objects extended in this draft is for IRO, which has the same format of ERO.  So I think it is better to have this draft to follow the RSVP sub-objects format.

In summary, I think the Domain ID TLV can be defined as defined in [HPCE- PCEP-EXT] (with some refinement), IRO subject extension can be defined as defined in [draft-dhody].

What are your opinions?







Thanks

Fatai

From: pce-bounces@ietf.org [mailto:pce-bounces@ietf.org] On Behalf Of Dhruv Dhody
Sent: 2011年9月12日 18:50
To: pce@ietf.org
Subject: [Pce] Update in ID: draft-dhody-pce-pcep-domain-sequence


Dear All,



We have rolled out a new version for DOMAIN-SEQ draft.

http://tools.ietf.org/html/draft-dhody-pce-pcep-domain-sequence-01



Main Changes done:

* Alignment for the new sub-objects

* Support for 4 byte AS number



We are still awaiting comments/suggestions in WG regarding

* New IRO Class Type for domain Sequence

* Use of RBNF to explain Subobjects ordering within domain-sequence(IRO Object)



For more information refer Message Thread:

http://www.ietf.org/mail-archive/web/pce/current/msg02580.html



We plan to resolve this before/during the next IETF meeting.



Regards,

Dhruv



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Dhruv Dhody

Senior Technical Leader, Huawei Technologies India Pvt. Ltd., Bangalore, India. Ph +91-9845062422


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[Pce] Update in ID: draft-dhody-pce-pcep-domain-s… Dhruv Dhody
Re: [Pce] Update in ID: draft-dhody-pce-pcep-doma… Zhangfatai
Re: [Pce] Update in ID: draft-dhody-pce-pcep-doma… Dhruv Dhody