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Re: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt

Tim Chown <Tim.Chown@jisc.ac.uk> Mon, 22 October 2018 10:00 UTC

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From: Tim Chown <Tim.Chown@jisc.ac.uk>
To: Mikael Abrahamsson <swmike@swm.pp.se>
CC: Brian E Carpenter <brian.e.carpenter@gmail.com>, 6man <ipv6@ietf.org>
Subject: Re: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt
Thread-Topic: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt
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Date: Mon, 22 Oct 2018 09:59:52 +0000
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> On 22 Oct 2018, at 06:22, Mikael Abrahamsson <swmike@swm.pp.se> wrote:
> 
> On Mon, 22 Oct 2018, Brian E Carpenter wrote:
> 
>> Wait, are you saying that no switches contain ARP caches? That would
>> truly surprise me.
> 
> The only IPv4 state that an L2 switch might contain for purpose of forwarding packets is if that switch implements SAVI like functionality.
> 
> The L2 switch doesn't need an ARP cache to perform its basic function. I have plenty of stupid L2 switches here in my household that doesn't have a management interface and doesn't understand IP at all. They only do ethernet header functions.

There may be some examples where there are "helpers" supported, such as IGMP snooping, to store state about observed multicast sources, but those are more likely in enterprise deployments than home networks.

Tim

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