On 2008-05-16, Charlie Allom  wrote:

quoted text
> Hi,

>

> I am trying to setup an active/active routing firewall setup with OSPF

> so it load shares the traffic equally.

>

> I am have created a test lab with IOS ASBR's that have

> `default-information originate always` so I then can see 2 routes to

> 0.0.0.0/0.0.0.0 via 2 routes.

>

> It seems there is a limitation with *bsd's kernels in that they do not

> allow for ECMP routing. ie, they can have only one default route at one

> time.

>

> Does OpenOSPFd work around this (and I've just got my setup wrong) or

> is the sad truth that OSPF prefixes will work, except the for the

> default route? (ie quagga on *bsd has this issue).

OpenBSD kernel routing code has had ECMP for a little while, and in

4.3 ospfd started supporting it too.
You just need to enable multipath forwarding in /etc/sysctl.conf, 2 lines

below where you enable IP forwarding, and either reboot or manually set

the sysctl.