Re: [LARTC] Configuring a redundant ethernet connection

[Doug Kingston]

It turns out that the bonding driver does indeed handle interface redundancy to two separate switches. Martin was right and the kernel documentation file (networking/bonding.txt) is packed full of useful information. The specific section that deals with what I need is under the heading "High Availability", option 2 "HA on two or more switches (or a single switch without trunking support)". It uses link status to determine that the interface is alive and uses one and only one at a given time.

bonding.txt is well worth a good read.

-Doug-

Jose Luis Domingo Lopez wrote:

On Wednesday, 22 January 2003, at 10:07:32 -0600,
Martin A. Brown wrote:

: I am interested in setting up a host with dual ethernet connections to
: the same IP subnet (but different switches) for redundancy. We need
: reasonably transparent failover if an interface fails.

Linux supports channel bonding which should do what you want. There is
little documentation outside the kernel for this, but what documentation
exists is very good. This can be found in a linux source tree in the
following file:

As far as I know ethernet bonding (trunking) is a layer-2 point-to-point thing. So you need compatible bonding implementations at both sides, and
every cable in the trunk on each end must go to the same box.

The original poster said "dual ethernet connections to the same IP
subnet (but different switches)", so I'm afraid bonding is not an option.

Regards,

--

Douglas Kingston
Director
Global Unix Engineering Manager

Deutsche Bank AG London
6 Bishopsgate
London EC2N 4DA

Work:	+44-20-7545-3907
Mobile:	+44-7767-616-028


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