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From: "Derek Marcotte" <derek@cpa-inc.net>
To: "Chuck Swiger" <cswiger@mac.com>, <questions@freebsd.org>
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Date: Tue, 15 Jul 2003 15:11:58 -0400
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Subject: Re: Kernel load balancing
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> Do you want to do trunking for extra bandwidth, for redundancy
in case of
> failure...what problem are you trying to solve?

Exactly... Both.  Ok, so let's make this a little more complex.
Here's how I envisioned this working.

Subnet A 192.168.0.0/24
Subnet B 192.168.1.0/24

Subnet C 192.168.2.0/30
Subnet D 192.168.2.4/30

Router 1
fxp0 192.168.0.1/24
fxp1 192.168.2.1/30
fxp2 192.168.2.5/30

Router 2
fxp0 192.168.1.1/24
fxp1 192.168.2.2/30
fxp2 192.168.2.6/30

router1 route add 192.168.1.0/24 192.168.2.2
router1 route add 192.168.1.0/24 192.168.2.6

router2 route add 192.168.0.0/24 192.168.2.1
router2 route add 192.168.0.0/24 192.168.2.5


(may wrap)
SubnetA---fxp0---router1----fxp1---- Subnet
C ----fxp1----router2---fxp0---SubnetB


SubnetA---fxp0---router1----fxp2---- Subnet
D ----fxp2----router2---fxp0---SubnetB


I intend to run Zebra and OSPF on routers 1 and 2.  Subnets A and
B are 100 Mbit/s networks.  Subnets C and D are 10 Mbit/s
networks, I would like to have a ~20 Mbit/s pipe when both lines
are up, but if one fails, it dumbs down to ten.  I am familiar
with OSPF enough to (hopefully :) make it through the routing and
failover, but I don't feel that Zebra will give me a 20 Mbit
pipe.

I am thinking about this in a routing frame of mind... Perhaps if
there is a way to just "pair" up the adapters at the ethernet
level it would be a simpler solution, but it would have to be
able to fail over without blinking...  I do not of such a
capacity in FreeBSD, but if there is one, I would love to hear
about it.

Does this help to clarify the situation?

Cheers,
Derek