1-6Route RecursionThe nexthops of some BGP routes (except eBGP routes) and static routes configured with nexthopsmay not be directly connected. To forward the packets, the outgoing interface to reach the nexthopmust be available. Route recursion is used to find the outgoing interface based on the nexthopinformation of the route. Link-state routing protocols, such as OSPF and IS-IS, do not need routerecursion because they obtain nexthop information through route calculation.Sharing of Routing InformationAs different routing protocols use different routing algorithms to calculate routes, they may finddifferent routes. In a large network with multiple routing protocols, it is required for routing protocols toshare their routing information. Each routing protocol has its own route redistribution mechanism. Fordetailed information, see the Layer 3 - IP Routing Configuration Guide.Configuring a Router IDSome routing protocols use a router ID to identify a device. You can configure a global router ID for adevice. If no router ID is configured for a protocol, the global router ID is used.To do… Use the command… RemarksEnter system view system-view —Configure a router ID router id router-idOptionalNot configured by default.Some routing protocols use a router ID to identify a device. You can configure a global router ID for adevice. If no router ID is configured for a protocol, the global router ID is used.A route ID is selected in the following sequence:
