netdev - Re: Is 802.3ad mode in bonding useful ?

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Message-ID: <4DBAC442.6050706@gmail.com>
Date:	Fri, 29 Apr 2011 21:59:30 +0800
From:	WeipingPan <panweiping3@...il.com>
To:	Neil Horman <nhorman@...driver.com>
CC:	netdev@...r.kernel.org
Subject: Re: Is 802.3ad mode in bonding useful ?

On 04/29/2011 06:43 PM, Neil Horman wrote:
> On Fri, Apr 29, 2011 at 11:17:48AM +0800, WeipingPan wrote:
>> On 04/28/2011 08:21 PM, Neil Horman wrote:
>>> On Thu, Apr 28, 2011 at 03:33:50PM +0800, WeipingPan wrote:
>>>> Hi, all,
>>>>
>>>> 802.3ad mode in bonding implements 802.3ad standard.
>>>>
>>>> I am just wondering  802.3ad mode is useful,
>>>> since  bonding has many modes like balance-rr, active-backup, etc.
>>>>
>>> Yes, of course its usefull.  For switches which support 802.3ad, this mode
>>> allows for both peers to understand that the links in the bond are acting as an
>>> aggregate, which makes it easier to prevent things like inadvertently looped
>>> back frames, for which the other modes have to have all sorts of hacks to
>>> prevent.
>> What is looped back frames here ?
> In this case they are frames that get received by the bond, which the bond
> itself sent.  In modes where more than one slave is active, and in which the
> switch has no additional knoweldge of the aggregate (e.g. round robin mode), the
> bond can send a frame on one slave, which the switch may broadcast to all ports,
> causing the frame just sent by the bond to then get received on another slave.
>
>> I didn't see any special code to handle looped back frames in other
>> modes in bonding,
>> can you take an example ?
>>
> See bond_handle_frame.
>
> Neil
>
Oh, I got it.

Thanks for your clear explanation !
Weiping Pan

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