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Re: [Lsr] New Version Notification for draft-ietf-lsr-isis-area-proxy-02.txt

"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> Mon, 03 August 2020 17:56 UTC

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Robert Raszuk <robert@raszuk.net>
CC: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "tony.li@tony.li" <tony.li@tony.li>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] New Version Notification for draft-ietf-lsr-isis-area-proxy-02.txt
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Date: Mon, 03 Aug 2020 17:55:58 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/smZtoSi6x_rGWdlaBZ1Neu4JXhc>
Subject: Re: [Lsr] New Version Notification for draft-ietf-lsr-isis-area-proxy-02.txt
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Robert –

You need to allow that not everything in the world is identified by an IP/IPv6 address.

If you want an IP address shared by all nodes in an area there is already a mean of doing that: assign a common anycast address on all nodes.

The value add (if there is any) of an Area SID is that I don’t have to assign an anycast address to all nodes. I can associate the SID with an identifier that is already shared and known by all nodes in the area.
If you don’t see that as worthwhile, fine, let’s abandon the Area SID idea.

   Les



From: Robert Raszuk <robert@raszuk.net>
Sent: Monday, August 03, 2020 10:47 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Cc: bruno.decraene@orange.com; tony.li@tony.li; lsr@ietf.org
Subject: Re: [Lsr] New Version Notification for draft-ietf-lsr-isis-area-proxy-02.txt

Hi Les,

Well I am talking about IP routable identifier which I can place on the front of the packet and which can assure that the packet will arrive at given area.

Then Area SID becomes analogy of Node SID :)

Thx

On Mon, Aug 3, 2020 at 7:40 PM Les Ginsberg (ginsberg) <ginsberg@cisco.com<mailto:ginsberg@cisco.com>> wrote:
Robert –

Both OSPF and IS-IS have area identifiers which are advertised.
Why would we need to invent another identifier for an area?

   Les


From: Robert Raszuk <robert@raszuk.net<mailto:robert@raszuk.net>>
Sent: Monday, August 03, 2020 10:31 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com<mailto:ginsberg@cisco.com>>
Cc: bruno.decraene@orange.com<mailto:bruno.decraene@orange.com>; tony.li@tony.li<mailto:tony.li@tony.li>; lsr@ietf.org<mailto:lsr@ietf.org>
Subject: Re: [Lsr] New Version Notification for draft-ietf-lsr-isis-area-proxy-02.txt

Les,

> But currently the draft is defining a SID which is NOT associated with a prefix.
+
> But if the proposal is to use a SID associated with a prefix then I see no need to invent a new SID advertisement.

How about we first define an "Area Prefix" (IP address being a property of an area) then assign SID to it ?

- - -

How odd it may sound I would like to still be able to direct traffic (read ip tunnel) traffic to an area without any SID.

Thx,
R.

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