one routers has 4 subnets: 10.1.1.0,10.1.2.0,10.1.3.0,10.1.4.0
another routers have one or two subnets ,in the style of: 10.1.10.0,10.1.11.0 , and so on
All subnets have the same area
All routers have also few tunnels uinto area 0 ( HeadQuater )
Routers are located in the different locations of the couontry, connected with gre ipsec tunnels
All are the ABR's
The questoin is if i should set the summarizing on all of them to 10.1.0.0/16 ?
If the routers are in different locations and they all connect back to area 0 then you can't summarise to 10.1.0.0/16 on all the routers because then you will have multiple routes to the 10.1.0.0/16 network with no way of knowing which one is the right one for a particular 10.1.x.0 subnet. So you will have to advertise the individual subnets or possible summarise but not to 10.1.0.0/16 ie. you will have to be much more specific in how you summarise each sites 10.1.x.0 subnets.
Edit - can you clarify. The routers are all in the same area and they are in different parts of the country. Are they interconnected with each other or only connected via GRE tunnels to area 0 ?
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