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Re: [pim] RFC 4541 - 224.0.0.*

Stig Venaas <stig@venaas.com> Thu, 08 November 2018 08:27 UTC

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From: Stig Venaas <stig@venaas.com>
Date: Thu, 08 Nov 2018 00:27:42 -0800
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To: Ganesh.ChennimalaiSa@dell.com
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Subject: Re: [pim] RFC 4541 - 224.0.0.*
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Hi

The problem is that many stacks don't send IGMP reports for link-local
groups, making the assumption that only routers need to know about
membership, and link-local groups are not routed. Hence, you cannot
rely on IGMP to determine which ports have interested receivers.

Stig

On Sun, Nov 4, 2018 at 4:55 PM <Ganesh.ChennimalaiSa@dell.com> wrote:
>
> Hi,
>
>
>
> Looking at RFC4541 and specifically the discussion 2..1.2 (2) on data forwarding rules. It says
>
>
>
> “Packets with a destination IP (DIP) address in the 224.0.0.X range
>
>       which are not IGMP must be forwarded on all ports.”
>
>
>
> As I see, there may not be explicit joins in this range and looking at IANA registry most protocols look chatty.
>
>
>
> Are there any groups with silent listeners that use this range ?
>
>
>
> regs
>
> Ganesh
>
>
>
> _______________________________________________
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