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A routing table usually consists of a list of possible destination networks or IP addresses for which the next hop is known. By only storing next-hop information, next-hop routing or next-hop forwarding reduces the size of routing tables. A given gateway only knows one step along the path, not the complete path to a destination. If no next hop ...
next hop: The next hop, or gateway, is the address of the next station to which the packet is to be sent on the way to its final destination; Depending on the application and implementation, it can also contain additional values that refine path selection: quality of service associated with the route. For example, the U flag indicates that an ...
The Next Hop Resolution Protocol (NHRP) is an extension of the ATM ARP routing mechanism [1] that is sometimes used to improve the efficiency of routing computer network traffic over a non-broadcast, multiple access (NBMA) network. [2] It is defined in IETF RFC 2332, [3] and further described in RFC 2333. [4]
The IP forwarding algorithm is a specific implementation of routing for IP networks. In order to achieve a successful transfer of data, the algorithm uses a routing table to select a next-hop router as the next destination for a datagram. The IP address of the selected router is known as the next-hop address. [1] The IP forwarding algorithm ...
The routing metric used by RIP counts the number of routers that need to be passed to reach a destination IP network. The hop count 0 denotes a network that is directly connected to the router. 16 hops denote a network that is unreachable, according to the RIP hop limit. [4]
Address resolution: mapping between IP addresses and link-layer addresses. Next-hop determination: hosts can find next-hop routers for a destination. Neighbor unreachability detection (NUD): determine that a neighbor is no longer reachable on the link. Duplicate address detection (DAD): nodes can check whether an address is already in use.
The network with the longest subnet mask or network prefix that matches the destination IP address is the next-hop network gateway. The process repeats until a packet is delivered to the destination host, or earlier along the route, when a router has no default route available and cannot route the packet otherwise.
The collection of best next hops forms the routing table. This contrasts with distance-vector routing protocols , which work by having each node share its routing table with its neighbours. In a link-state protocol, the only information passed between the nodes is the information used to construct the connectivity maps.