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EIGRP Con guration
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E11 1721610/24 E21 E01 E31 10110/24
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2101 The CD contains a multimedia demonstration of configuring EIGRP on a router Here s the routing configuration of the router for Figure 21-1:
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Router(config)# router eigrp 200 Router(config-router)# network 1721600 Router(config-router)# network 10000
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This router has four interfaces: 1721611/24, 1721621/24, 10111/24, and 10121/24 Remember that when configuring your network commands, put in only the Class A, B, or C network numbers, or qualify them with a subnet mask In the preceding example, the Class B and A network numbers were entered, activating EIGRP routing on all four interfaces You could also have been more specific with your network statements, by including the subnet mask value to include specific interfaces in the EIGRP AS, like this:
Router(config)# router Router(config-router)# Router(config-router)# Router(config-router)# Router(config-router)# eigrp 200 network 1721610 2552552550 network 1721620 2552552550 network 10110 2552552550 network 10120 2552552550
Either of these two approaches will work in the example in Figure 21-1; however, in practice, I recommend using the latter; especially in situations where your router might be running more than one routing protocol, such as EIGRP and OSPF, and you want only certain subnets of a class address included in each routing protocol
21: EIGRP Routing
Other EIGRP Commands
You should be aware of three other configurations when enabling EIGRP: load balancing, summarization, and authentication of routing updates
Load Balancing
EIGRP supports load balancing across six paths to the same destination By default, EIGRP will do only equal-cost load balancing With equal-cost load balancing, EIGRP will only use successor routers that have the same metric value However, you can enable unequal-cost load balancing of EIGRP routes by using the variance and traffic-share Router Subconfiguration mode commands To enable unequal-cost paths for EIGRP, use the variance Router Subconfiguration mode command:
Router(config)# router eigrp autonomous_system_# Router(config-router)# variance multiplier
The multiplier value is a positive integer By default, the variance is equal to one To use an unequal-cost path (less preferred), the router multiplies the best metric path (feasible distance) by the multiplier value; if the less preferred path s metric (advertised distance) is less than this value, the router will include it in the routing table along with the best metric path The multiplier can range from 1 to 128 The default is 1, which means the EIGRP router will use only the best metric path(s) If you increase the multiplier, the router will use any route that has a metric less than the best metric route multiplied by the variance value Care must be taken, however, to ensure that you do not set a variance value too high; otherwise routing loops may accidentally be created To illustrate how this is used, examine Table 21-2 In this example, three neighbors are advertising the same route, 19216810/24, to your router By default, RouterB has the best feasible distance and is thus used in your router s routing table as a successor route If you set the variance to 2, then RouterC s alternative path could also be included in the routing table along with RouterB s successor route:
TABLE 21-2
Example EIGRP Topology Table for Variance Computation
Network Number
19216810/24
Neighboring Router
RouterB RouterC RouterD
Feasible Distance (FD)
40 60 85
Advertised Distance (AD)
20 20 35
EIGRP Con guration
RouterC s FD (60) is less than 2 times RouterB s FD (40) In other words 60 < 2 40 (or 80) RouterD s path is not used since its FD is greater than 2 times RouterB s FD
Be able to correctly compute additional successor routes
added to the routing table by using a variance multiplier
When load balancing, the router will do the process intelligently In other words, if you have two WAN links (64 Kbps and 128 Kbps) included in the routing table to reach a single destination, it makes no sense to send half of the traffic down the 64 Kbps link and the other half down the 128 Kbps link In this situation, you would probably saturate your slower-speed 64 Kbps link EIGRP, instead, will load-balance traffic in proportion to the inverse of the metric for the path So, given this example, about one-third of the traffic would be sent down the 64 Kbps link and two-thirds down the 128 Kbps link You can override this behavior with the traffic-share Router Subconfiguration mode command:
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