netdev - Re: [PATCH 2/2] bridge: allow forwarding some link local frames

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Date:	Mon, 17 Oct 2011 13:53:23 -0700
From:	Ross Brattain <ross.b.brattain@...el.com>
To:	Ed Swierk <eswierk@...switch.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] bridge: allow forwarding some link local frames

On Mon, 17 Oct 2011 07:35:53 -0700
Ed Swierk <eswierk@...switch.com> wrote:

> Why is forwarding LLDP (01-80-C2-00-00-0E) frames forbidden? I'm
> testing LLDP in a virtual topology and need the bridge to forward
> them.
> 
> If we're worried about standards, there is justification for allowing
> forwarding of LLDP frames. 802.1d-2005 specifies two classes of
> bridge, customer (C-VLAN) and provider (S-VLAN). Customer bridge is
> just new terminology for what was previously just called an
> 802.1d-compliant bridge, while provider bridge is a new class that
> transparently forwards certain control frames.

01-80-C2-00-00-0E should not pass the physical link.  If it does it will affect PFC 802.1Qbb and ETS 802.1Qaz.

802.1AB-2009 is more specific.  See Table 7-1 Group MAC addresses used by LLDP:

Nearest bridge: 01-80-C2-00-00-0E
Propagation constrained to a single physical link; stopped by all types of bridge

Nearest non-TPMR bridge: 01-80-C2-00-00-03
Propagation constrained by all bridges other than TPMRs; intended for use within provider bridged networks

Nearest Customer Bridge: 01-80-C2-00-00-00
Propagation constrained by customer bridges; this gives the same coverage as a customer-customer MACSec connection


--
Ross
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