HP 6120XG HP ProCurve Series 6120 Blade Switches Multicast and Routing Guide - Page 71
Configuring RIP, Overview of RIP
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IP Routing Features Configuring RIP Configuring RIP This section describes how to configure RIP using the CLI interface. To display RIP configuration information and statistics, see "Displaying RIP Information" on page 3-31. Overview of RIP Routing Information Protocol (RIP) is an IP route exchange protocol that uses a distance vector (a number representing distance) to measure the cost of a given route. The cost is a distance vector because the cost often is equivalent to the number of router hops between the ProCurve routing switch and the destination network. A ProCurve routing switch can receive multiple paths to a destination. The software evaluates the paths, selects the best path, and saves the path in the IP route table as the route to the destination. Typically, the best path is the path with the fewest hops. A hop is another router through which packets must travel to reach the destination. If the ProCurve routing switch receives a RIP update from another router that contains a path with fewer hops than the path stored in the ProCurve routing switch's route table, the routing switch replaces the older route with the newer one. The routing switch then includes the new path in the updates it sends to other RIP routers, including ProCurve routing switches. RIP routers, including ProCurve routing switches, also can modify a route's cost, generally by adding to it, to bias the selection of a route for a given destination. In this case, the actual number of router hops may be the same, but the route has an administratively higher cost and is thus less likely to be used than other, lower-cost routes. A RIP route can have a maximum cost of 15. Any destination with a higher cost is considered unreachable. Although limiting to larger networks, the low maximum hop count prevents endless loops in the network. The switches covered in this guide support the following RIP types: ■ Version 1 ■ V1 compatible with V2 ■ Version 2 (the default) 3-25