I'm trying to figure why my routing topology isn't work as it should. I need to make an project for some dwdm equipments to be managed from one central location. Because the project contains more than 100 devices I split the map into 3 different OSPF areas. The problem with this topology is that is very unstable. If one of the optical devices is down, in many cases, just one backbone router of total of five "hear" about this change. The backbone routers are distributed along the borders of transit areas. To be more clear I'll attach a small picture which contains only 2 backbone routers. In the picture, I draw 2 routers, both have physical connections to Area 1 and 2 and the direct link between this two is defined as a trunk, for carrying 2 vlans : one for area 2 protection and another for backbone connectivity. Each one of this vlans has IPs from different subnets and they are assigned on different logical interfaces. Did someone tried a topology like this : to carry 2 different logical links which are in different areas over the same wire? In a lot of documentations I saw that is necessary to have an interface only in one area but I think there is no difference between physical and virtual ones. Am I wrong? Any advise can be useful. Thanks in advance and excuse my bad English.
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