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[Xen-devel] Re: [RFC] Arp announce (for Xen)

To: Stephen Hemminger <shemminger@xxxxxxxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: [Xen-devel] Re: [RFC] Arp announce (for Xen)
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Fri, 02 Mar 2007 08:46:04 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Jeff Garzik <jeff@xxxxxxxxxx>, Andi Kleen <ak@xxxxxx>, netdev@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, Ian Pratt <ian.pratt@xxxxxxxxxxxxx>, Zachary@xxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
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On 2/3/07 01:30, "Stephen Hemminger" <shemminger@xxxxxxxxxxxxxxxxxxxx>

> What about implementing the unused arp_announce flag on the inetdevice?
> Something like the following.  Totally untested...
> Looks like it either was there (and got removed) or was planned but
> never implemented.

This would be acceptable. It only needs a simple script to poke the correct
value, and that could be easily integrated into vendor scripts. The general
idea of being able to have a callback to userspace is okay but we'd like
something lighter weight for live migration, which is typically done only
within the scope of a single layer-2 network and hence all that is really
required is the gratuitous ARP to kick the switch hardware.

 -- Keir

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