Date: Thu, 31 Oct 2002 17:07:42 +0200 From: Petri Helenius <pete@he.iki.fi> To: Don Bowman <don@sandvine.com> Cc: "'freebsd-net@freebsd.org'" <freebsd-net@FreeBSD.ORG> Subject: Re: ng_fec hash mechanism versus cisco etherchannel Message-ID: <3DC1473E.70802@he.iki.fi> References: <FE045D4D9F7AED4CBFF1B3B813C8533701022DF6@mail.sandvine.com>
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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
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