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Figure 23-4: The network after convergence is achieved This entire example, although a bit oversimplified, displays the basic operation of RIP For a more complete understanding of RIP, you need to learn about a few other features: update timers, split horizon (with and without poison reverse), holddown timers, route poisoning, and triggered updates Update timers are used so that the router knows how long to wait before sending periodic updates In RIP version 1, each update includes all routes (except those removed by split horizon), regardless of whether any changes have occurred since the last update The periodic update process ensures that routers can determine whether other routers are down (almost like a pulse) But the short time period that RIP waits between updates, coupled with the fact that the full routing table is advertised during each update, means that RIP updates can use large amounts of bandwidth in complex networks The update timer is configurable on Cisco routers, but you must ensure that all routers have the same timer settings Split horizon is one of several features implemented in distance vector routing to reduce the possibility of routing loops Basic split horizon ensures that routes learned through a given interface are never broadcast back out the same interface In addition, the network associated with an interface is never advertised on that same interface Split horizon with poison reverse reduces the convergence time associated with split horizon in the case of a routing loop by advertising an infinite metric on a given interface for routes learned through that interface The examples following this brief explanation include both split horizon and split horizon with poison reverse, so don't get concerned if this discussion doesn't make sense yet Holddown timers are used to prevent loops in a complex topology by requiring that the RIP router wait a specified period of time (180 seconds, or 6 times the update interval, by default) before believing any new information about an updated route Holddown timers are sort of like the reality check of distance vector routing They are discussed further in the coming example as well Route poisoning is also used to reduce the possibility of routing loops Without route poisoning, bad routing entries are removed from the table after the route timeout and routeflush timers expire The route timeout timer (called the invalid timer in IOS) is used to determine when a route has failed If an update has not heard about a given route before this.

21/tcp 22/tcp 23/tcp 25/tcp 80/tcp 110/tcp 111/tc0p 113/tcp 143/tcp 512/tcp 513/tcp 514/tcp 587/tcp 783/tcp 940/tcp 946/tcp 7256/tcp

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timer expires, the route is considered invalid and enters holddown The route, however, is still used (but no longer advertised) until the route-flush timer expires Once the route-flush timer expires, the route is entirely removed from the routing table The default setting for the route timeout is 180 seconds, and the default setting for the routeflush timer is 240 seconds Without route poisoning, a router simply stops advertising bad routes after the route timeout timer expires The next router in line then needs to wait for its route timeout to expire, and so on This means that in a large RIP network (10+ hops), it could take over 30 minutes for all routers to be notified of a bad route (which can eliminate the usefulness of holddown timers) Route poisoning works with triggered updates to reduce this time by advertising a route with an infinite metric (16 in RIP) once that route's timeout timer expires Route poisoning, when combined with triggered updates, could reduce the convergence time for a 10+ hop network to less than 30 seconds Triggered updates are used to reduce both the possibility of routing loops and to reduce the network convergence time If a link to a directly connected network fails, rather than waiting on an update timer to expire, RIP immediately advertises the failure (as an infinite distance, as per route poisoning) Also, once a route has been updated, RIP immediately advertises the updated route, rather than waiting for the update timer to expire Finally, if an indirect failure occurs (ie, the router doesn't hear about an advertised route and the timeout timer expires), triggered updates are used in conjunction with route poisoning to propagate the route failure quickly At this point, you are probably thinking that RIP is not so simple after all In truth, it is really a very simple protocol Being simple has its benefits, but the major drawback is that routing loops are very easy to come by Because of routing loops, all of these additional features are required, which introduce the complexity into the equation To help you understand why all of these features are required, let's take a simple mesh network (shown in Figure 23-5) and examine the RIP update process without the benefit of any of the loop-prevention mechanisms.

Cost of Airline Operations in $ per Available Seat-Mile (ASM)

TIP To list open or listening ports on most machines, use the command netstat -l (UNIX) or netstat -a (Windows) (shown in Figure 12-15)

Figure 23-5: A simple mesh for the routing loop example Initially, the only routes that any routers are aware of are their directly connected networks This means that Jack, Danny, and Hallorann would have routing tables similar to those shown in Table 23-1

Table 23-1: Initial Routing Tables for Figure 23-5 Network Next Hop Metric Jack Danny Hallorann 10000 1721600 10000 19216810 19216810 1721600 192168500

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