From owner-freebsd-net  Fri Feb 26 13:14:50 1999
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Date: Fri, 26 Feb 1999 23:13:18 +0200
From: Petri Helenius <pete@sms.fi>
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To: Luigi Rizzo <luigi@labinfo.iet.unipi.it>
Cc: archie@whistle.com, venkats@austin.ibm.com,
	freebsd-net@FreeBSD.ORG
Subject: Re: etherchannel support
References: <199902261800.TAA26142@labinfo.iet.unipi.it>
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Luigi Rizzo wrote:
> 
> > > > > > > Does freebsd  have support for Cisco's etherchannel ?
> > > ...
> > > > > hmm... i see it easy for incoming path, but what about the outgoing ?
> > > > > How do you chose which interface to use for output, what about load
> > > > > balancing, etc ?
> > > > Well, what does Cisco do?
> > >
> > > hey, i asked first!
> > >
> > >         cheers
> > >         luigi
> > >
> > They XOR the low byte of the source and destination mac addresses and use
> > 1-3 low order bits to determine the link to transmit on. (etherchannel
> > supports
> > at least up to 8 links between two devices)
> 
> hmm... so if all your cards use the same mac address (which could
> be useful to simplify life when doing ARP-related stuff etc) you
> effectively only use one link ?
> 
That would be true only if you talk only to one host on the same VLAN.

Pete


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