netdev - Re: [Patch net-next 2/3] bridge: only expire the mdb entry when query is received

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Date:	Tue, 30 Apr 2013 11:32:04 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Herbert Xu <herbert@...dor.hengli.com.au>
Cc:	netdev@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	"David S. Miller" <davem@...emloft.net>,
	Adam Baker <linux@...er-net.org.uk>
Subject: Re: [Patch net-next 2/3] bridge: only expire the mdb entry when
 query is received

On Tue, 2013-04-30 at 11:22 +0800, Herbert Xu wrote:
> On Tue, Apr 30, 2013 at 11:17:37AM +0800, Cong Wang wrote:
> > 
> > One problem with this solution is that the temp mdb entry will no longer
> > be expired automatically any more, since no query no timer.
> > 
> > I am wondering if we should find other way to fix it, for example,
> > touching the timer as long as there is multicast traffic (non-IGMP).
> 
> mdb entries represent group subscriptions.  So what you're saying
> is that group subscriptions aren't expiring.
> 
> Which isn't a problem at all since if there is no querier then group
> subscriptions shouldn't expire.  There has to be at least one querier
> in the network for this thing to work.  Otherwise it just degenerates
> into a non-snooping switch, which is OK.

Makes sense. I will put this in the changelog.

Thanks.

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