Re: [Lsr] 答复: Option B from "Migration between normal flooding and flooding reduction"

Peter Psenak <ppsenak@cisco.com> Tue, 28 May 2019 07:34 UTC

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To: Aijun Wang <wangaijun@tsinghua.org.cn>, "'Tony Li'" <tony1athome@gmail.com>, "'Robert Raszuk'" <robert@raszuk.net>
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From: Peter Psenak <ppsenak@cisco.com>
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Date: Tue, 28 May 2019 09:34:23 +0200
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Subject: Re: [Lsr] =?utf-8?b?562U5aSNOiBPcHRpb24gQiBmcm9tICJNaWdyYXRpb24gYmV0?= =?utf-8?q?ween_normal_flooding_and_flooding_reduction=22?=
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Aijun,

On 28/05/2019 08:15, Aijun Wang wrote:
> Hi, Tony:
>
> How the receiver judge the leader has stopped advertising the Area Leader sub-TLV? Do you need some timers?

no timer needed, all event driven. Area Leader sub-TLV is removed from 
the LSP.

thanks,
Peter

>>From the current discussion, I think the explicit instruction that proposed by Huaimo is more acceptable.
>
>
> Best Regards.
>
> Aijun Wang
> Network R&D and Operation Support Department
> China Telecom Corporation Limited Beijing Research Institute,Beijing, China.
>
> -----邮件原件-----
> 发件人: Tony Li [mailto:tony1athome@gmail.com]
> 发送时间: 2019年5月27日 12:20
> 收件人: Robert Raszuk
> 抄送: lsr@ietf.org
> 主题: Re: [Lsr] Option B from "Migration between normal flooding and flooding reduction"
>
>
> Hi Robert,
>
>> The current draft is pretty robust in terms of area leader election. It also says that  "Any node that is capable MAY advertise its eligibility to become Area Leader”
>
>
> Correct.  This can be all systems. It can be one. For redundancy, a few would be sensible.
>
>
>> With that can you confirm the procedure to "resign" as area leader ?
>
>
> Stop advertising the Area Leader sub-TLV.  It’s that simple.
>
>
>> Especially that under those circumstances just having active area leader to resign clearly is not enough to change given flooding scheme.
>
>
> If there are multiple potential area leaders, then all of them would have to resign.
>
>
>> In some deployments all eligible nodes may advertise such capability which in turn the "resign" procedure would require NMS action to disable such capability by configuration and re-flooding it. Not that I am advocating it nor see need for complex migration procedures, but just would like to better understand the "resign" part.
>
>
> Correct, this is rightfully an NMS operation.
>
> Tony
>
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