6-19z To ensure the uniqueness of a router ID and enhance network reliability, you can specify in BGPview the IP address of a local loopback interface as the router ID.z If no router ID is specified in BGP view, the global router ID is used. For information about globalrouter ID, see IP Routing Basics Configuration in the Layer 3 - IP Routing Configuration Guide.z If the global router ID is used and then it is removed, the system will select a new router ID.z If the router ID is specified in BGP view, using the undo router-id command can make the systemselect a new router ID.Follow these steps to create a BGP connection:To do… Use the command… RemarksEnter system view system-view —Enable BGP and enter BGP view bgp as-number—Not enabled by defaultSpecify a Router ID router-id ip-addressOptionalBy default, the global router ID isused.Specify a peer or a peer group andits AS numberpeer { group-name | ip-address }as-number as-numberRequiredNot specified by defaultEnable the default use of IPv4unicast address family for thepeers that are established usingthe peer as-number commanddefault ipv4-unicastOptionalEnabled by defaultEnable a peer peer ip-address enableOptionalEnabled by defaultConfigure a description for apeer/peer grouppeer { group-name | ip-address }description description-text Not configured by default.z Since a router can reside in only one AS, the router can run only one BGP process.z You need to create a peer group before configuring it.Specifying the Source Interface for TCP ConnectionsBGP uses TCP as the transport layer protocol. By default, BGP uses the output interface of the optimalrouter to a peer as the source interface for establishing TCP connections to the peer. If a BGP routerhas multiple links to a peer, when the source interface fails, BGP has to reestablish TCP connections,
