What we did was BGP advertise the whole block out out both connections
and then advertise the smaller blocks out the primary for that block.
We worked with our upstream and advertised /29 networks in some cases.
Since both BGP and OSPF use the most specific range, this works well.
So, on your 2 border routers you tell OSPF to share the default route.
On all other routers you tell OSPF not to share the default route.
Based on the costs you have setup in OSPF, some will go out one way and
some the other. You just need to make sure your costs divide the
network the same way you are doing with your BGP routes.
There are other ways to do this that I am sure other folks will share,
but this one does work.
On 8/31/2015 2:54 PM, Ty Featherling wrote:
I use OSPF to hand internal routing and BGP to talk to my provider. I just
turned up a second circuit on the network so naturally I would like to be
able to route some subnets through one connection and others through the
other with either failing over should one connection go down. I get that I
can advertise each subnet as small as /24 out of either or both connections
but weighted differently so that one path is preferred while available. The
question I have is how do I pass down which path should be taken on the
outgoing side via OSPF? I'm sure it has to do with sharing default routes
but could someone help me understand what needs done?
-Ty
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Scott Reed
Wireless Networking
Network Design, Installation and Administration
Mikrotik Advanced Certified
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