From owner-freebsd-net Thu Oct 31 7: 7:48 2002 Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 92FC537B401 for ; Thu, 31 Oct 2002 07:07:47 -0800 (PST) Received: from silver.he.iki.fi (silver.he.iki.fi [193.64.42.241]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2207843E77 for ; Thu, 31 Oct 2002 07:07:46 -0800 (PST) (envelope-from pete@he.iki.fi) Received: from he.iki.fi (localhost.he.iki.fi [127.0.0.1]) by silver.he.iki.fi (8.12.6/8.11.4) with ESMTP id g9VF7hYi007491; Thu, 31 Oct 2002 17:07:43 +0200 (EET) (envelope-from pete@he.iki.fi) Message-ID: <3DC1473E.70802@he.iki.fi> Date: Thu, 31 Oct 2002 17:07:42 +0200 From: Petri Helenius User-Agent: Mozilla/5.0 (X11; U; Linux i386; en-US; rv:0.9.4) Gecko/20011126 Netscape6/6.2.1 X-Accept-Language: English [en],Finnish [fi] MIME-Version: 1.0 To: Don Bowman Cc: "'freebsd-net@freebsd.org'" Subject: Re: ng_fec hash mechanism versus cisco etherchannel References: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org It does not matter if you send using the other link as long as you send all packets for the same stream over the same link to avoid reordering. So yes, it does interoperate. Pete Don Bowman wrote: >Examining the source code to ng_fec, in ng_fec_output(), it uses the >IP address to form the hash to pick the port. This is the same behaviour >that 802.3ad specifies, and yields good behaviour since: > >a: it works in routed environments as well as local area >b: packets are not reordered within L4 sessions. > >However, cisco seems to imply they use a hash based on MAC: >http://www.cisco.com/warp/public/cc/techno/media/lan/ether/channel/prodlit/f >aste_an.htm >for some devices (e.g. a cat5000). >Others (e.g. cat7500, cat8500) use L3 as ng_fec does. >Yet others use SA based distribution (e.g. the cat1900, 2820). > >Does the ng_fec interoperate with the L2 only devices of cisco? > > >--don (don@sandvine.com www.sandvine.com) > >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message