Re: [CCAMP] Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Path Diversity using Exclude Routes

"Zafar Ali (zali)" <zali@cisco.com> Wed, 09 October 2013 22:04 UTC

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From: "Zafar Ali (zali)" <zali@cisco.com>
To: John E Drake <jdrake@juniper.net>, Fatai Zhang <zhangfatai@huawei.com>, "Zhangxian (Xian)" <zhang.xian@huawei.com>, "CCAMP (ccamp@ietf.org)" <ccamp@ietf.org>
Thread-Topic: [CCAMP] Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Path Diversity using Exclude Routes
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Date: Wed, 09 Oct 2013 22:04:18 +0000
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Subject: Re: [CCAMP] Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Path Diversity using Exclude Routes
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John: 

Scope of the draft is to define UNI-C and the problem you are hanged on
beyond the scope of UNI-C and that aspect is clear stated in the draft.
Furthermore, I cited two deployment use cases one of which is based on
distributed path computation and other does not require single omniscient
entity.  

Thanks

Regards Š Zafar


-----Original Message-----
From: "jdrake@juniper.net" <jdrake@juniper.net>
Date: Wednesday, October 9, 2013 3:14 PM
To: zali <zali@cisco.com>, Fatai Zhang <zhangfatai@huawei.com>, "Zhangxian
(Xian)" <zhang.xian@huawei.com>, "ccamp@ietf.org" <ccamp@ietf.org>
Subject: RE: [CCAMP] Resource ReserVation Protocol-Traffic Engineering
(RSVP-TE) Path Diversity using Exclude Routes

>Zafar,
>
>Snipped, comment inline.
>
>Yours Irrespectively,
>
>John
>
>> -----Original Message-----
>> From: Zafar Ali (zali) [mailto:zali@cisco.com]
>> Sent: Wednesday, October 09, 2013 12:54 AM
>> To: Fatai Zhang; Zhangxian (Xian); CCAMP (ccamp@ietf.org)
>> Cc: John E Drake
>> Subject: Re: [CCAMP] Resource ReserVation Protocol-Traffic Engineering
>> (RSVP-TE) Path Diversity using Exclude Routes
>> 
>> Fatai and John:
>> 
>> In most of the cases, when the UNI-N node computing the path is also
>> hosting the RSVP-TE FEC against which exclusion is required, it knows
>>the
>> path take by the other LSP. For the other cases, please note that just
>> because optical network is running GMPLS UNI for client interface does
>>not
>> mean that it is running RSVP-TE for the optical trail management. E.g.,
>>optical
>> trail management can still using an already deployed proprietary
>>mechanisms
>> or an NMS based scheme. The draft is addressing schemes that are capable
>> of this functionality.
>
>[JD]  So, you are finally admitting that despite what your draft
>currently states, your draft only works
>If the server network is controlled by a single omniscient entity.  As I
>said before, this is useless.
>