5-16z To configure basic functions of BGP peer group, you need to create the BGP peer group first. Referto section “Configuring BGP Peer Group” for information about creating a BGP peer group.z In order for route updating packets being sent even if problems occur on interfaces, you canconfigure the source interfaces of route update packets as a loopback interface.z Normally, EBGP peers are connected through directly connected physical links. If no such linkexists, you need to use the peer ebgp-max-hop command to allow the peers to establishmultiple-hop TCP connections between them. If loopback interfaces are used to establishconnections between EBGP peers, the peer ebgp-max-hop command is unnecessary.Note the following:z It is required to specify for a BGP router a router ID, a 32-bit unsigned integer and the uniqueidentifier of the router in the AS.z You can specify a router ID manually. If not, the system selects an IP address as the router ID. Theselection sequence is: If loopback interface addresses are available, the last configured loopbackinterface IP address is used as the router ID; otherwise, the first configured interface IP address isused as the router ID. It is 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 the BGP process isrestarted.Configuring the Way to Advertise/Receive Routing InformationConfiguration PrerequisitesEnable the basic BGP functions before configuring the way to advertise/receive BGP routinginformation.Make sure the following information is available when you configure the way to advertise/receive BGProuting 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.Importing RoutesWith BGP employed, an AS can send its interior routing information to its neighbor ASs. However, theinterior routing information is not generated by BGP, it is obtained by importing IGP routing informationto BGP routing table. Once IGP routing information is imported to BGP routing table, it is advertised toBGP peers. You can filter IGP routing information by routing protocols before the IGP routinginformation is imported to BGP routing table.Follow these steps to import routes:
