Re: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01

Parag Kaneriya <pkaneria@juniper.net> Thu, 03 December 2020 06:07 UTC

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From: Parag Kaneriya <pkaneria@juniper.net>
To: Aijun Wang <wangaijun@tsinghua.org.cn>, "'Acee Lindem (acee)'" <acee=40cisco.com@dmarc.ietf.org>, 'lsr' <lsr@ietf.org>
Thread-Topic: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01
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Date: Thu, 3 Dec 2020 06:07:32 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/UYcR_6dgHcgUtRGkgArolFkUIno>
Subject: Re: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01
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Hello Aijun,

Every router by default support algo 0.  When router support IP-FLEX algo along with default algo, we need to be deterministic when there is conflict of prefix advertise in both algo. This conflict might be due to mis config. So when such condition arise, prefix belong to default algo should give priority to be install in forwarding table.

Regards
Parag


Juniper Business Use Only
From: Lsr <lsr-bounces@ietf.org> On Behalf Of Aijun Wang
Sent: Thursday, December 3, 2020 7:02 AM
To: 'Acee Lindem (acee)' <acee=40cisco.com@dmarc.ietf.org>rg>; 'lsr' <lsr@ietf.org>
Subject: Re: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01

[External Email. Be cautious of content]

Hi, authors:

Want to confirm one thing:
Does the mechanism described in this draft support the automatic fallback from "flex algorithm" to the "traditional least-cost algorithm"?
That is to say, can one prefix exists both in the "flex algorithm" table and "traditional least-cost algorithm" table, the router prefer to forwarding the packet based on the former table, and if not hit, then lookup the latter table?

>From the context of the document, the answer seems not, or even on the contrary?
In cases where a prefix advertisement is received in both a IPv4
   Prefix Reachability TLV and an IPv4 Algorithm Prefix Reachability
   TLV, the IPv4 Prefix Reachability advertisement MUST be preferred
   when installing entries in the forwarding plane.

If so, what the value to deploy such flexible algorithm within the network? From my POV, the reason that we want to deploy such mechanism is that we want to differentiate the path(result of flex algorithm) of some traffic from that(result of traditional least-cost algorithm) of most other normal traffic.

Best Regards

Aijun Wang
China Telecom

From: lsr-bounces@ietf.org<mailto:lsr-bounces@ietf.org> <lsr-bounces@ietf.org<mailto:lsr-bounces@ietf.org>> On Behalf Of Acee Lindem (acee)
Sent: Wednesday, December 2, 2020 5:13 AM
To: lsr <lsr@ietf.org<mailto:lsr@ietf.org>>
Subject: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01

This IP Flex Algorithm draft generated quite a bit of discussion on use cases and deployment prior to IETF 109 and there was generally support for WG adoption. This begins a two week WG adoption call. Please indicate your support or objection to WG adoption on this list prior to 12:00 AM UTC on December 16th, 2020. Also, review comments are certainly welcome.
Thanks,
Acee