![]() ![]() Mask: supplements the destination address to specially identify the address of the network segment where the destination host or router resides. The command output is as follows: display ip routing-table You can run the display ip routing-table command on a router to view basic information about the routing table of the router. When multiple routes have different routing protocol preferences and metrics, route backup can be implemented among these routes to improve network reliability. When multiple routes have the same routing protocol preference and metric, load balancing can be implemented among these routes to relieve network pressure. Optimal route selection depends on routing protocol preferences and metrics of routes. When multiple routes are available to send packets from a router to the destination, the router can select the optimal route from an IP routing table. The last router is responsible for sending the packet to the destination host.Ī route is a path along which packets are sent from the source to the destination. Upon receiving a packet, a router selects a proper path, which may have one or multiple hops, to send the packet to the next router according to the destination address in the packet. The following describes a router's role in a network, and the purpose and nature of routes.Ī router selects routes and forwards packets. Each of these devices serves a different role, but for a common purpose: forming a functioning network. ![]() On the Internet, network connecting devices such as hubs, bridges, switches, and routers control traffic and ensure data transmission quality. The system searches the tunnel list for a tunnel that is destined for this loopback IP address and then adds the tunnel information to the routing table. ![]() This generates a FIB entry.Ī next-hop IP address of a BGP VPN route is often the IP address of an indirectly connected PE's loopback interface, and the BGP route needs to be iterated to a tunnel. The system searches the IP routing table for a direct route (an IGP route in most cases) that is destined for the next-hop IP address of the BGP route and then adds the next-hop IP address and outbound interface of the IGP route to the IP routing table. The following examples demonstrate how route iteration generates an FIB entry.Ī next-hop IP address of a BGP route is often the IP address of an indirectly connected peer's loopback interface, and therefore the BGP route needs to be iterated. In most cases, BGP routes, static routes, and user network routes (UNRs) do not have directly connected next hops, and route iteration is required. The system then needs to search for directly connected next hops and corresponding outbound interfaces. However, this condition may not be met when routes are generated. ![]() Routes can be used to forward traffic only when they have directly connected next hops. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |