We are busy building a test lab with multiple OSPF Areas connected to a backbone area and will eventually build an MPLS network with BGP on top of this.
Step 1 was to configure PtP addresses and Loopbacks and then split the network into backbone area plus additional areas.
Step 2 was to configure route summarization on ABR routers, we would typically summarize routes on the ABR from the Aera 0.0.0.0 going into Area 0.0.0.1 and vica versa.
This worked great and reduced the number of routes on both backbone and other areas to a single prefix.
Problem: When enabling LDP, routing between different areas stops working. i.e traffic within the same area works, but routing traffic between areas, using the summarized routes is no longer possible. Once we disable LDP, routing between areas immediately starts working again.
This testlab is built using RouterOS 7.13
Any inputs / suggestions / ideas welcome.
I would be happy to provide some network design drawings if needed.