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Re: [Lsr] draft-ietf-lsr-isis-area-proxy-02

Tony Li <tony1athome@gmail.com> Thu, 06 August 2020 16:31 UTC

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From: Tony Li <tony1athome@gmail.com>
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Date: Thu, 06 Aug 2020 09:31:42 -0700
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Cc: "Acee Lindem (acee)" <acee@cisco.com>, Bruno Decraene <bruno.decraene@orange.com>, "lsr@ietf.org" <lsr@ietf.org>
To: Les Ginsberg <ginsberg@cisco.com>
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Subject: Re: [Lsr] draft-ietf-lsr-isis-area-proxy-02
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Les,

>  There then remains the question as to whether the “Area Prefix” is anycast or unicast i.e., is it common to all IERs or is it unique to whomever gets elected Area Leader?
>   
> Does it matter? We have no clear semantics for this prefix. A difference that makes no difference is no difference.
>  
> [Les:] This question needs to be directed at those who prefer the Area Prefix approach. It matters as it impacts configuration and advertisement semantics. An anycast prefix is NOT a Node Prefix.
> And it impacts how traffic is forwarded into the area.
>  
>  
>  
> How so?  Traffic will be directed to the SID value (modulo PHP). 
> [Les3:] If the prefix is private to a single router then traffic has to pass through that router. If it is anycast the traffic could arrive at any one of the routers supporting the anycast address.
> 


I must be missing something. My understanding of SR is that you forward based on the label.  Please educate me.

Tony

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