Hi, Acee and Adrian:
I noticed the CATS WG began just the use cases and architecture document and will follow the progress of works in CATS WG to update the proposed draft.
And I want to empathize also that current IGP based proposal will not “ compromise convergence for the "Normal business" of the IGP ”, only the nodes that updated, or the nodes want to utilize such information will calculate the optimal path based on the network and compute information.
There will be also no LOOP in the forwarding plane, because the traffic will be tunneled to the optimal destination edge node.
Aijun Wang
China Telecom
>
> Speaking as co-chair of LSR:
>
>>
>> Hi,
>>
>> Speaking as co-chair of CATS.
>>
>> The CATS working group is still not ready for any protocol solutions work, although we are aware that a number of proposals have been made.
>>
>> At the moment we are still developing the architecture, requirements, and metrics. These are fundamentals that we need to resolve before it is appropriate to get behind any protocol solutions.
>
> That’s fine with us since we have a backlog of drafts to consider in LSR.
>
>>
>> However, it is worth noting that CATS is an edge function. That is, it does traffic steering not routing/forwarding within the network. One of the issues to be resolved is how to get the right compute metric information to the right places in the network without challenging other places to handle unwanted information.
>
> Right - it seems we’ve been all through this in the initial CATS discussions. When we do get to solutions, attaching this compute capacity information to the base topology LSAs and LSPs is definitely the wrong direction.
>
>
>>
>> In this context, many might apply caution to the use of an IGP because of the load it places on every node in the network even though most of those nodes do not need to see the compute traffic. It might be worrying that this load would compromise convergence for the "Normal business" of the IGP - namely to forward packets.
>
> Exactly.
>
> Thanks,
> Acee
>
>
>>
>> It might be useful to look at the work done long ago in the L1VPN working group to use a separate instance of the IGP (in that case, the work was only done for OSPF) to distribute VPN membership information between remote peers at the edge of the network. This approach protects transit routers from the additional information and makes it just an edge function. See RFC 5252 and RFC 5523.
>>
>> Cheers,
>> Adrian
>>
>> -----Original Message-----
>> Sent: 15 November 2024 02:18
>> Subject: [Lsr] 转发: New Version Notification for draft-wang-lsr-network-computing-optimization-00.txt
>>
>> Hi, All:
>>
>> We have submitted one document that proposes the IGP based solution for network-computing-combined optimization, which can apply to the scenarios that discussed within CATS WG.
>> Feedbacks and comments are welcome.
>>
>> Aijun Wang
>> China Telecom
>>
>> -----邮件原件-----
>> 发送时间: 2024年11月15日 10:15
>> 主题: New Version Notification for draft-wang-lsr-network-computing-optimization-00.txt
>>
>> A new version of Internet-Draft
>> draft-wang-lsr-network-computing-optimization-00.txt has been successfully submitted by Aijun Wang and posted to the IETF repository.
>>
>> Name: draft-wang-lsr-network-computing-optimization
>> Revision: 00
>> Title: IGP based Network Computing Combined Optimization
>> Date: 2024-11-15
>> Group: Individual Submission
>> Pages: 13
>> URL: https://www.ietf.org/archive/id/draft-wang-lsr-network-computing-optimization-00.txt
>> Status: https://datatracker.ietf.org/doc/draft-wang-lsr-network-computing-optimization/
>> HTMLized: https://datatracker.ietf.org/doc/html/draft-wang-lsr-network-computing-optimization
>>
>>
>> Abstract:
>>
>> This document describes the scenario and procedures that can be used
>> to accomplish the IGP based network and computing combined
>> optimization within the IS-IS or OSPF domain.
>>
>>
>>
>> The IETF Secretariat
>>
>>
>>
>> _______________________________________________
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>> _______________________________________________
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