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Hi,First, I believe Loopback interface has nothing to do with DR/BDR enlection, bcoz DR/BDR election is the property of the interface that connects to a BMA network. Loopback interface are always treated as Stub network in OSPF and no neighborship wi...
Avoid injecting external routes in to your OSPF domain as they will be advertised in to your entire domain. Still if you need them, then as said go for NSSA
