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as RIP or OSPF Some routing protocols, such as EIGRP, use autonomous systems, which group networks under a single administrative control Administrative distance is used by a Cisco router to choose among multiple routing protocols to put a destination in the routing table The routing protocol with the lowest administrative distance with a path to the destination is placed in the routing table There are two types of routing protocols: static and dynamic When choosing a dynamic routing protocol, you should consider routing metrics, how routing information is shared, convergence time, how routing information is processed, and routing overhead Routing metrics define the method used to calculate a cost to a destination For instance, RIP uses hop count Distance vector protocols use broadcasts to share routing information and don t verify whether neighbors receive routing updates They use the Bellman-Ford algorithm to process updates, which requires very little CPU processing and memory: They receive an update, increment the metrics, compare the results to the routing table, and update the routing table if necessary Link state protocols use the SPF algorithm to build the routing table, providing a loop-free topology They use multicasts to share routing information incrementally and verify that neighbors received this information Link state protocols support classless routing and allow you to summarize networking information in your routing table The main downside of these protocols is that they require more CPU cycles and memory to process and store routing information They are also prone to flapping route problems Hybrid protocols are based on the simplicity of a distance vector protocol but borrow from many features of link state protocols to make them more efficient and scalable RIPv2, EIGRP, and BGP are examples of hybrid protocols Distance vector protocols have problems with convergence and routing loops Convergence is the amount of time it takes for all of the routers in the network to understand the current topology Triggered updates can be used to speed up convergence A routing loop is basically a disagreement about how to reach a particular network Counting to infinity is resolved by placing a hop count limit to prevent packets from circling around the loop forever Split horizon is used to prevent the creation of small routing loops: It prevents a router from advertising a route out the same interface from which the route was learned Route poisoning, poison reverse, and hold-down timers are used to prevent large routing loops A route is poisoned if a network connected to a router goes down Poison reverse has a router advertise a poisoned route out all interfaces, including the interface from which it was learned Hold-down timers keep the poisoned route in the routing table to ensure the poisoned route is propagated to all routers before any (worse) alternative paths are chosen
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15: Routers and Routing
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TWO-MINUTE DRILL
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Routing Introduction
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Routers learn about neighboring routers, find locations of destination
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networks, choose the best paths to each destination, and maintain routing tables
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A static route is a manually configured route A connected route is a network
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to which the router is directly connected on an interface
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An autonomous system (AS) is a group of networks under a single
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administrative control, which could be your company, a division within your company, or a group of companies
Administrative distance is a Cisco-proprietary mechanism used to rank IP
routing protocols, and it helps the router populate the routing table with best paths to destinations If you are running more than one routing protocol, administrative distance can determine which routing protocol to use when populating the routing table The lower the administrative distance number, the more preferred the protocol
Dynamic Routing Protocols
Internally, a routing protocol will use a metric to choose a best path to reach
a destination when more than one path exists to a destination within the same routing protocol
Distance vector protocols, such as RIPv1, use distance and direction to find
paths to a destination and are referred to as routing by rumor They generate periodic updates as broadcasts and build no formal relationships with other routers They require little processing and memory, since they simply need to increment metrics and compare these to current networks in the routing table
Link state protocols, such as OSPF, use the SPF algorithm and understand the
complete topology of the network (routing by propaganda) They multicast LSAs, which are specific routes, when changes occur in the network The LSAs are stored in a link state database These protocols converge fast, since they use incremental updates, but they require more memory and processing power They also support a hierarchical structure and route summarization
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