Operation Manual – Routing ProtocolH3C S5600 Series Ethernet Switches Chapter 5 BGP Configuration5-20z You can specify a router ID manually. If not, the system selects an IP address asthe router ID. The selection sequence is: If loopback interface addresses areavailable, the last configured loopback interface IP address is used as the routerID; otherwise, the first configured interface IP address is used as the router ID. Itis recommended to specify a loopback interface address as the router ID toenhance network reliability.z Router IDs can be re-selected. A re-selected router ID takes effect only after theBGP process is restarted.5.4 Configuring the Way to Advertise/Receive RoutingInformation5.4.1 Configuration PrerequisitesEnable the basic BGP functions before configuring the way to advertise/receive BGProuting information.Make sure the following information is available when you configure the way toadvertise/receive BGP routing information.z The summarization mode, and the summary route.z Access list numberz Filtering direction (advertising/receiving) and the route policies to be adopted.z Route dampening settings, such as half-life and the thresholds.5.4.2 Importing RoutesWith BGP employed, an AS can send its interior routing information to its neighborASs. However, the interior routing information is not generated by BGP, it is obtainedby importing IGP routing information to BGP routing table. Once IGP routinginformation is imported to BGP routing table, it is advertised to BGP peers. You canfilter IGP routing information by routing protocols before the IGP routing information isimported to BGP routing table.Follow these steps to import routes:To do... Use the command... RemarksEnter system view system-view —Enter BGP view bgp as-number —Enable redistribution ofdefault routes to the BGProuting tabledefault-route importedOptionalBy default, BGP does notimport default routes toBGP routing table.
