CHAPTER 6 - Implementing RIP, Version 2

Abstract

Routing Information Protocol (RIP), version 2, is a nonproprietary distance vector protocol that is easy to implement in a network infrastructure. When RIP 2 sends updates, the router sends its entire routing table to all directly connected routers. The router will do this every 30 seconds on all interfaces where RIP is enabled. If a certain network or route goes down before the 30-second interval completes, the router can send a triggered update. RIP 2 sends its updates via broadcast or by using a Class D multicast address of 224.0.0.9. The time interval can be modified when a router sends its RIP updates. RIP 2 is also able to summarize routes. Summarizing Internet Protocol (IP) addresses means one has fewer routes available in the routing table because a combination of IP addresses is used. A smaller routing table means faster route propagation and faster updates. RIPv2 enhances the RIP protocol by using multicast to send the routing updates as well as allowing authentication and route summarization to be utilized. A number of debug commands are available to enable troubleshoot RIP 2 that include debug ip rip, which can be used to display RIP 2 routing transactions.