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

"Aijun Wang" <wangaijun@tsinghua.org.cn> Tue, 28 May 2019 06:16 UTC

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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Tony Li'" <tony1athome@gmail.com>, "'Robert Raszuk'" <robert@raszuk.net>
Cc: <lsr@ietf.org>
References: <5316A0AB3C851246A7CA5758973207D463BBD21B@sjceml521-mbs.china.huawei.com> <CF5E5FE7-C2E2-4200-AE8A-6BF5E558258C@tony.li> <5316A0AB3C851246A7CA5758973207D463BC58F5@sjceml521-mbx.china.huawei.com> <BYAPR11MB3638190EC8AD3235AB2304E7C1060@BYAPR11MB3638.namprd11.prod.outlook.com> <5316A0AB3C851246A7CA5758973207D463BC5C32@sjceml521-mbx.china.huawei.com> <BYAPR11MB3638722A90E40777657001B8C1000@BYAPR11MB3638.namprd11.prod.outlook.com> <CAOj+MMEijyB7qd4oUaOe7W19j+76CjH+mzJ3mvcVtOjn5fvmdw@mail.gmail.com> <BYAPR11MB363863B393A181264E07B042C1000@BYAPR11MB3638.namprd11.prod.outlook.com> <MN2PR13MB3470B24A328311A23BAAC5B8A3000@MN2PR13MB3470.namprd13.prod.outlook.com> <MN2PR13MB34701B410A172A950BAE6B5EA31C0@MN2PR13MB3470.namprd13.prod.outlook.com> <FB4EDF4B-C94D-4654-8D3A-A1567E0D76B1@gmail.com> <CAOj+MMGDodnxktZCuqPfVDCRbu0+yUR--DiZKTqVQ=4thAM5rw@mail.gmail.com> <4DFD8BB4-AA63-4BE6-9927-4557AB32ABD9@gmail.com>
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Date: Tue, 28 May 2019 14:15:48 +0800
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Hi, Tony:

How the receiver judge the leader has stopped advertising the Area Leader sub-TLV? Do you need some timers? 
>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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