From: Ross Brattain <ross.b.brattain@intel.com>
To: Ed Swierk <eswierk@bigswitch.com>
Cc: Stephen Hemminger <shemminger@vyatta.com>,
"David S. Miller" <davem@davemloft.net>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: [PATCH 2/2] bridge: allow forwarding some link local frames
Date: Mon, 17 Oct 2011 13:53:23 -0700 [thread overview]
Message-ID: <20111017135323.00003ee5@unknown> (raw)
In-Reply-To: <CAF5U64AYRhZ1e0=-RhSemgaOnewTQSpAoRY2FUrFr252PG98Pw@mail.gmail.com>
On Mon, 17 Oct 2011 07:35:53 -0700
Ed Swierk <eswierk@bigswitch.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
next prev parent reply other threads:[~2011-10-17 20:53 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20111004041444.793960297@vyatta.com>
2011-10-04 4:14 ` [PATCH 1/2] bridge: leave carrier on for empty bridge Stephen Hemminger
2011-10-06 19:28 ` David Miller
2011-10-04 4:14 ` [PATCH 2/2] bridge: allow forwarding some link local frames Stephen Hemminger
2011-10-04 19:11 ` Benjamin Poirier
2011-10-05 19:40 ` Ben Hutchings
2011-10-05 20:50 ` Stephen Hemminger
2011-10-06 19:28 ` David Miller
2011-10-17 14:35 ` Ed Swierk
2011-10-17 15:18 ` Stephen Hemminger
2011-10-17 20:53 ` Ross Brattain [this message]
2011-10-17 21:09 ` Ed Swierk
2011-10-17 23:07 ` Ross Brattain
2011-10-17 23:36 ` Ed Swierk
2011-10-18 0:00 ` John Fastabend
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