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Administrative Distance
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As mentioned in the chapter introduction, each router needs to choose a best path to a destination This process can become somewhat complicated if the router is receiving routing update information for a single network from multiple sources, such as connected, static, and IGP routing protocols, and must choose one of these sources as the best and place this choice in the router s routing table As you will see in the next few sections, a router looks at two items when choosing a best path: administrative distance and routing metricsThe first item a router looks at is the administrative distance for a route source Administrative distance is a Ciscoproprietary mechanism used to rank the IP routing protocols As an example, if a router was running two IGPs, RIP and EIGRP, and was learning network 10000/8 from both of these routing protocols, which one should the router pick and place in its routing table Which one should the router believe more Actually, the term administrative distance is somewhat misleading, since the term has nothing to do with measuring distance The term believability better describes the process
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15: Routers and Routing
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TABLE 15-2
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0 0 or 1 90 110 120 170 255
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Route Type
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Connected interface route Static route Internal EIGRP route (within the same AS) OSPF route RIPv1 and v2 route External EIGRP (from another AS) Unknown route (is considered an invalid route and will not be used)
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Administrative distance ranks the IP routing protocols, assigning a value, or weight, to each protocol Distances can range from 0 to 255 A smaller distance is more believable by a router, with the best distance being 0 and the worst, 255 Table 15-2 displays some of the default administrative distances Cisco has assigned to its IP routing protocols Going back to the previous example of a router learning network 10000/8 from RIP and EIGRP, since RIP has a value of 120 and EIGRP 90, the router will use the EIGRP route, since this protocol has a better (lower) administrative distance value
Here are some important protocols to know and their administrative distances: connected (0), static (0 or 1), EIGRP (90), OSPF (110), and RIP (120)
The protocol with a lower distance is preferred over a higher one, where the most believable route is a directly connected one
CERTIFICATION OBJECTIVE 1502
Dynamic Routing Protocols
Unlike static routes that require manual configuration to tell the router where destination networks are, dynamic routing protocols learn about destination networks from neighboring routers through a sharing process Dynamic routing protocols fall under one of three categories: distance vector, link state, and hybrid Each of these
Dynamic Routing Protocols
routing protocol types takes a different approach in sharing routing information with neighboring routers and choosing the best path to a destination Because of the differences between the various routing protocol types, each has advantages and disadvantages One choice you ll have to make will be which routing protocol you ll run on the routers in your network You ll have to examine the following factors when choosing a routing protocol:
Routing metrics used to choose paths How routing information is shared Convergence speed of the routing protocol How routers process routing information Overhead of the routing protocol
The following sections discuss these topics
Routing Metrics
As mentioned in the Administrative Distance section, if your router has two types of routes, such as RIP and EIGRP, for the same network number, the router uses the administrative distance to choose the best one However, a situation might arise where two paths to the destination network exist, and the same routing protocol, RIP, for instance, discovers these multiple paths to the destination network If this is the case, a routing protocol will use a measurement called a metric to determine which path is the best path to place in the routing table Table 15-3 lists some common metrics, the IP routing protocols that use them, and brief descriptions of the metrics As you can see from this table, some routing
TABLE 15-3
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