We have the OSPF network shown in the drawing and I am trying to understand what OSPF should be doing.
When the HQ internet is lost, the higher AD of the MPLS edge router flips the gateway to that side for DR internet. That works.
The 525 and 515 PIX firewalls should be getting the default route from the edge router and distributing this to the inside Network.
The 525 firewall is working and distributing the default to the inside network.
The 515 sees the default advertised from the edge router, but uses the default it is getting from the 6509 switch (which is getting it's default from the 525 PIX, gotten from the edge router).
I am trying to understand what OPSF is doing with the two processes in the PIXs and why the 515 prefers the inside to the outside.
I realize the PIX may be confused with the 525 default information originate, which is telling everything on the inside to use it as the default route, while the edge router is also telling the 515 it has the default route.
So, the 6509 is advertising the 525 to everyone internally as the default correct?
But why wouldn't it just as equally use the edge router if it is advertising as a gateway?
Is there a guide to understanding the ospf database and how a device prefers a particular route with that database?