Can the existing route configuration information of the old network be inherited during network reconstruction?

Can the existing route configuration information of the old network be inherited during network reconstruction?

The configuration of the OSPF routing information of the old network should be revised. Generally, the OSPF routing protocol uses commands network x.x.x.x area x to broadcast OSPF hello packet to all devices. If the old OSPF configuration is directly inherited, because the IP addresses of the super VLAN on the N18K are gateway IP addresses in each network segment, the OSPF hello packet is broadcast to all sub VLANs. Therefore, if the OSPF route is dynamically advertised using the network manner, the OSPF-based passive interfaces should be enabled on the N18K, that is, passive-interface xxx. All SVI interfaces (gateways) of the super VLAN should be set to OSPF-based passive interfaces. In this manner, when the device advertises the network segment addresses, the L2 network does not have a large number of OSPF hello packets, thereby reducing the network pressure. in another deployment mode, the network dynamic route advertisement is not implemented. The advertisement is implemented by means of route re-distribution. In OSPF routing mode, the redistribute connected subnets are configured, so that the device does not send the OSPF hello packet to all sub VLANs. The route is only advertised to the directly-connected L3 physical ports.