Search results
Distance-vector Routing. HW 3 due now. CSE 123: Computer Networks Alex C. Snoeren . Lecture 13 Overview. Distance vector. . Assume each router knows its own address and cost to reach each of its directly connected neighbors. Bellman-Ford algorithm. . Distributed route computation using only neighbor’s info. Mitigating loops. .
Distance Vector Algorithm. Pathologies: Bouncing and Counting to Infinity. Optimizations: Split Horizon and Poison Reverse. War Story: Synchronization of Routing Messages. The Routing Problem. Each router has several interfaces to links. Each router has unique node ID. Packets stamped with destination node ID.
Initialize neighbors with known cost, others with infinity. Periodically send copy of distance vector to neighbors. On reception of a vector, if neighbors path to a destination plus neighbor cost is better, then switch to better path. update cost in vector and next hop in routing table.
In computer communication theory relating to packet-switched networks, a distance-vector routing protocol is one of the two major classes of routing protocols, the other major class being the link-state protocol. A distance-vector routing protocol uses the Bellman-Ford algorithm to calculate paths. A distance-vector routing protocol requires ...
Reliable flooding. Each router transmits a Link State Packet (LSP) on all links. A neighboring router forwards out all links except incoming. Keep a copy locally; don’t forward previously-seen LSPs.
Distance vector protocols. As the name implies, distance vector routing protocols use distance to determine the best path to a remote network. The distance is something like the number of hops (routers) to the destination network.
• The distance vector routing is based on the Bellman-Ford algorithm • Every T seconds each router sends a list of distances to all the routers to its neighbor • Each router then updates its table based on the new information • Problems include fast response to good news and slow response to bad news.
