Topology two NE80(CE)-CN2(cisco12000PE)-S6506. S6506-CN2 and NE80-CN2 operate BGP protocol and IGP route protocol is OSPF and provides route to network side.
Cancel route iteration and establish BGP neighborhood through interconnection interface. The convergence quickens. So does switchover.
Two NE80 connect two C12000 and there is default uplink. It is introduced to OSPF and provide network with egress. C12000 and NE80 establishes E-BGP neighborhood through LOOPBACK interface. Uplink at NE80 passes through default static route. Uplink of static route is quick. C12000 obtains detailed route through BGP convergence. BGP convergence results in slow switchover.
Route iteration enables BGP neighbor and it influences convergence time. IT is suggested to use interconnection interface.