Operation Manual – IPv4 RoutingH3C S5500-EI Series Ethernet Switches Chapter 3 OSPF Configuration3-21After an OSPF GR Restarter restarts OSPF, it needs to perform the following two tasksin order to re-synchronize its LSDB with its neighbors.z To obtain once again effective OSPF neighbor information, supposing theadjacencies are not changed.z To obtain once again LSDB contents.Before the restart, the GR Restarter originates Grace-LSAs to negotiate the GRcapability. During the restart, the GR Helpers continue to advertise their adjacencieswith the GR Restarter.After the restart, the GR Restarter will send an OSPF GR signal to its neighbors that willnot reset their adjacencies with it. In this way, the GR Restarter can restore theneighbor table upon receiving the responses from neighbors.After reestablishing neighbor relationships, the GR Restarter will synchronize the LSDBand exchange routing information with all adjacent GR-capable neighbors. After that,the GR Restarter will update its own routing table and forwarding table based on thenew routing information and remove the stale routes. In this way, the OSPF routingconvergence is complete.3.1.7 Protocols and Standardsz RFC 1765:OSPF Database Overflowz RFC 2328: OSPF Version 2z RFC 3101: OSPF Not-So-Stubby Area (NSSA) Optionz RFC 3137: OSPF Stub Router Advertisement3.2 OSPF Configuration Task ListComplete the following tasks to configure OSPF:Task RemarksConfiguring OSPF Basic Functions RequiredConfiguring OSPF Area Parameters OptionalConfiguring the OSPF Network Type for anInterface OptionalConfiguring an NBMA Neighbor OptionalConfiguringOSPF NetworkTypesConfiguring a Router Priority for an OSPF Interface Optional
