Re: [MBONED] [Msr6] MSR6 BOF 3rd Issue Category: More details are requested about the large scale use cases, including issue 8-11

[Huaimo Chen <[e-mail]>]

Hi Dino,

    Thanks for your comments.
    My responses are inline below with [HC].

Best Regards,
Huaimo
________________________________
From: Msr6 <[e-mail]> on behalf of Dino Farinacci <[e-mail]>
Sent: Friday, October 21, 2022 12:18 PM
To: Yisong Liu <[e-mail]>
Cc: [e-mail] <[e-mail]>; [e-mail] <[e-mail]>; BIER WG <[e-mail]>; [e-mail] <[e-mail]>; Stig Venaas <[e-mail]>; [e-mail] <[e-mail]>
Subject: Re: [Msr6] MSR6 BOF 3rd Issue Category: More details are requested about the large scale use cases, including issue 8-11

> 1. From the view of existing MSR6 TE document, whether 10000 receivers encoded in a packet is acceptable or not depends

There is no reason that it is acceptable. There is not enough MTU for user data. Its absurd to even consider it.

[HC]: For a tree from an ingress/root to 10000 leaves, there are a number of
sub-trees from the ingress/root. If the number of sub-trees is 10 (for example),
each sub-tree has 1000 leaves on average. The ingress/root will send traffic
using each of these sub-trees.

> on the topology and the encoding method. In my understanding, in a total stateless solution, at least 10000 bit should be used for encoding such a multicast tree in the packet as the header expanse.

10000/8 = 1250 bytes

This is a non-starter of epic proportions.

[HC]: The overhead is 125 bytes if there are 10 sub-trees.
This size of overhead seems acceptable.

> 2. From the view of MSR6, we think this is valid scenario for the large network with large multicast trees and we can discuss more efficient solutions based on source-routing.

Right, and the exiting solutions have been proven, grant it with given control-plane complexity, are multi-router distribution trees where branches of the tree aggregate receiver state so per-receiver state need not be stored anywhere in the network.

Dino

--
Msr6 mailing list
[e-mail]
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fmsr6&amp;data=05%7C01%7Chuaimo.chen%40futurewei.com%7C77da704371c0436b1d3f08dab37fe1d0%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C638019659084018508%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=svAwrj9PZ4hTbInKC%2BjddtQlw51N9Milqv7JyELrv68%3D&amp;reserved=0