Routing

Hello,

In the snippet of the configuration in PDF, I do not see any configuration that will prefer st0.1 over sr0.2 over st0.3 and so on.

Also do you have IP monitoring configured to give preference to ISP connections & enable failover mechanism?

Regards,

Rushi

Thank you Rushi for the comment!

I did configure metric for primary, secondary, third, and forth, 0, 5, 10, 15  respectively. Since the traffic routed through New York after disabling the primary link, therefore, I removed them.

Also, I've configure rpm and IP monitoring for the ISPs. Since I want the VPNs route through OSPF, so I don't want to configure them under rpm and IP monitoring.

I believe I just need to find a way to send 10.4.0.0/16 only to New Jersey, no where else, ever; even if all the routes to New Jersey are down.

Also,  to send 10.2.0.0/16 only to New York, no where else, ever; even if all the routes to New York are down

Any idea about that?

Basically you need to have a higher cost for your primary link and then immediately the next cost value for each following link as I outlined above.

5 - primary

6 - secondary

7 - tertiary

8 - quaternary

The reason is when you lose the primary from A to B you now have two paths:

A secondary to B

A primary to C primary to B 

So the cost of 2 primary links must be greater than the cost of one secondary, tertiary and quaternary link or the dual hop path will win.  By setting the primary cost to 5 a dual primary is 10 which is higher than 6, 7 or 8 meaning all the alternate direct links will win when needed.

From what I see on your chart you have 3 sites and 4 paths per site for the OSPF mesh.

I think your issue is that two primary OSPF cost paths will sometimes be lower cost than your secondary, tertiary or quaternary path.

To alleviate this problem I would set the OSPF link costs on the tunnel as follows:

5 - primary

6 - secondary

7 - tertiary

8 - quaternary

This way even two primary paths will always be greater than a quaternary path.

Thank you Steve for the comment!

I already tried changing the metric which I believe affects the route preference, caused the traffic to go to New York instead of taking one of the paths (vpn tunnels) to New Jersey. So, I need to somehow stop receiving LSAs about 10.4.0.0/16 (New Jersey) from New York. 

Any idea please?