netdev - Re: Bonding and Neighbour Discovery on IPv6-only devices

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Date:	Wed, 24 Sep 2008 17:07:53 -0400
From:	Brian Haley <brian.haley@...com>
To:	Jay Vosburgh <fubar@...ibm.com>
CC:	Vlad Yasevich <vladislav.yasevich@...com>,
	Alex Sidorenko <alexandre.sidorenko@...com>,
	Jeff Garzik <jeff@...zik.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Bonding and Neighbour Discovery on IPv6-only devices

Jay Vosburgh wrote:
> Vlad Yasevich <vladislav.yasevich@...com> wrote:
> [...]
>> It doesn't.  What appears to happen in the active-backup case the MLD reports
>> are not generated on all of the slave devices, just the active one.  Thus the
>> switch knows only about the active device.
> 
> 	This behavior is by design.  Previously, it worked the other way
> (every slave did IPv6 addrconf stuff, etc), but that confused the
> switches because they'd snoop the addrconf traffic whenever a backup
> slave came up, and update the switch forwarding table.
> 
>> When you force the failover, no reports happen because the device believes that
>> the MLD group was already reported.  Thus there needs to be some trigger after
>> the failover to tell the switch that the mac address and multicast group have
>> moved to a different port.
> 
> 	Yes, there needs to be an ipv6 equivalent of the gratuitous ARP
> and IGMP rejoin that's done for ipv4.  I haven't figured out how to
> accomplish that yet; suggestions are welcome.

I have a patch that does it, just doing some final testing before 
sending it out, hopefully later today...

-Brian
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