Re: [pim] [PIM] New Version Notification for

"Stevens, Jim A Collins" <James.A.Stevens@collins.com> Wed, 12 July 2023 05:11 UTC

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From: "Stevens, Jim A Collins" <James.A.Stevens@collins.com>
To: "pim@ietf.org" <pim@ietf.org>
CC: Toerless Eckert <tte@cs.fau.de>
Thread-Topic: [PIM] New Version Notification for
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Date: Wed, 12 Jul 2023 05:10:38 +0000
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Subject: Re: [pim] [PIM] New Version Notification for
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> -----Original Message-----
> Date: Mon, 10 Jul 2023 23:37:12 +0200
> From: Toerless Eckert <tte@cs.fau.de>
>
> I have updated subject draft to hopefully address all the issues brought up
> about it during
> IETF116 meeting. Thanks for all the feedback!
>
> Cheers
>     Toerless
>
Toerless,

ASM is still an important multicast approach for intradomain operations for dynamic many-to-many communications.

Section 9.5 makes it sound like ASM should never be used in the internet.  this was not the intent of RFC 8815 which only deprecated ASM for use in interdomain operations.

I recommend the following changes to section 9.5  (** new or modified text is surrounded by asterisks **) including changing the title of that section.

    9.5 Standard for IP multicasting in ** intradomain ** networks

    This document removes the claim in the abstract of [RFC1112], that these host extensions are "... the recommended standard for IP multicasting in the Internet."

    The reason for this is that [RFC8815] deprecated the ASM Service ** for interdomain Internet operation ** because there is no Internet Standard solution for protocols to support interdomain ASM except for [RFC3956], which is only applicable to IPv6, and even that solution does not resolve the challenges to source access control in interdomain deployments.ΒΆ

    In result, ASM is today "only" a recommended solution for ** intradomain ** networks including controlled federated networks for applications for which SSM is not usable. ** As described in RFC 8815 section 4.4, this includes many-to-many communications patterns that where there can be more (S,G) state than is feasible for networks to manage.  As an example, BIDIR-PIM [RFC 5015] for IP multicasting to enable such scalable many-to-many group communications. **

    However, these limitations to the applicability of ASM ** have ** no impact ** to ** the applicability of most of the host stack described in this document for other forms of IP Multicast, specifically "Source Specific Multicast", [SSM], which inherits all aspects of ASM specified in this document, especially the sending (Section 6, Section 6.2) of IP Multicast packets as well as the mapping to ethernet (Section 6.4). It only amends the joining of IP Multicast traffic on IP Multicast receivers with additional procedures fitting into the host stack described in this document.

   **  So ASM remains one of the recommended standards for IP multicasting for intradomain operation in the Internet along with SSM. **

And, the reference to RFC 5015 means it needs to be added to section 10 references.

Jim Stevens