Figure 22.15 Initialization of tables in distance vector routing 22.31. and . Figure 22.14 Distance vector routing tables 22.30. BGP Path Vector Routing (PVR) Border Gateway Protocol (BGP) is an inter-domain or inter-autonomous system routing protocol routing between different ASs. Figure 22.13 Popular routing protocols 22.29. We talked about inter-domain routing Mechanism and policy BGP: Use path vector algorithm instead of DV or LS Path vector looks at reachability info only » Ignores metrics » Route selection is based on local policy UNICAST ROUTING PROTOCOLS three common protocols used in the Internet:-Routing Information Protocol (RIP), based on the distance-vector algorithm-Open Shortest Path First (OSPF), based on the link-state algorithm-Border Gateway Protocol (BGP), based on the path-vector algorithm Confirmed Distance vector Each node computes new cost vectors based on the new info using Bellman -Ford algorithm https://www.slideshare.net/bhagyashridhoke/ppt-of-routing-protocols TCP/IP Protocol Suite 4 14.2 DISTANCE VECTOR ROUTING In distance vector routing, the least cost route between any two nodes is In distance vector routing, the least cost route between any two nodes is the route with minimum distance. DVR and LSR are not suitable candidates for inter-AS routing ; DVR there are occasions in which the route with Figure 22.12 Autonomous systems 22.28. 2- Routing metric: The routing metric is a value repr esenting the path between the local router and the destination network, according to the routing protocol being used. Last time Intra-domain routing won’t work on the Internet DV and LS do not scale How do we pick a “global” metric? Routing protocol goal: determine “good” paths (equivalently, routes), from sending hosts to receiving host, through network of routers. In practice, each switch computes its routing table directly from the LSP’s it has collected using a realization of Dijkstra’s algorithm called the . Distance‐Vector and Path‐Vector Roung Secons 4.2.2., 4.3.2, 4.3.3 COS 461: Computer Networks Spring 2011 Mike BGP uses path vector routing to update the routing table in an area. Tentative. Path Vector Routing and BGP. forward search algorithm. Shortest Path Routing. The waypoint-based routing with SVR is inherently Secure vector routes define the path (e.g., set of routers) each session must follow within an SVR topology. Note In distance vector routing, each node 4-6 Ad Hoc On Demand Distance-Vector (AODV) Routing (2) Whenever routes are not used -> get expired -> Discarded Reduces stale routes Reduces need for route maintenance Minimizes number of active routes between an active source and destination Can determine multiple routes between a source and a destination, but implements only a single Every SVR-based router can be reached by one or more waypoints, and Bi-directional Forwarding Detection (BFD) is used to test connection and path attributes between the waypoints. In this protocol each node maintains a the route with minimum distance. Specifically each switch maintains two lists, known as . path: sequence of routers packets traverse from given initial source host to final destination host ARPAnet Routing (1969-78) Features: Cost=Queue length, Each node sends a vector of costs (to all nodes) to neighbors.
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