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Configuring EIGRP routing protocol on Cisco router

Posted: 2017-10-16

EIGRP (Enhanced Interior Gateway Routing Protocol) is one of the major IGP (Interior Gateway Protocol) that combine the distance-vector and link-state protocol methods, known as Hybrid Routing Protocol. It provides fast convergent, supports classless routing, provides load balancing between equal/unequal paths, predicts backup route (feasible successors) in case the primary route fails. EIGRP uses bandwidth and delay as metric with administrative distance of 90. When you setup up an EIRGP protocol, you must specify Autonomous System Number which is globally significant number for all routers to communicate. You also need to specify "no auto-summary" command to configure classless routing. Configuring EIGRP To configure EIGRP routing protocol; 1. Type conf t in the router privileged mode prompt. 2. Type router eigrp as-id - AS-ID (Autonomous process number or id is globally significant number that is common on all routers. 3. Type no auto-summary to enable classless routing. 4. Type network ip-address wildcard-mask - IP address is the IP of the router to route and wildcard-mask is reverse subnet mask of the network. For example, if the other router has and the subnet mask of, type network In the example below, we are configuring four routers with EIGRP. The three networks involved in this settings are,, and - see the picture First router has serial connection to second router and has single WAN network. R01#conf R01(config)#router eigrp 10 R01(config-router)#network R01(config-router)#no auto-summary R01(config-router)#exit R01(config)# Second router has physical connection with all other routers and has three WAN networks. R02#conf t Enter configuration commands, one per line. End with CNTL/Z. R02(config)#router eigrp 10 R02(config-router)#network R02(config-router)#network R02(config-router)#network R02(config-router)#no auto-summary R02(config-router)#exit R02(config)# Third router is connected to second router with single WAN network R03#conf t R03(config)#router eigrp 10 R03(config-router)#network R03(config-router)#no auto-summary R03(config-router)#exit R03(config)# Fourth router is connected to second router with single WAN network R04#conf t R04(config)#router eigrp 10 R04(config-router)#network R04(config-router)#no auto-summary R04(config-router)#exit R04(config)# Verify the dynamic build up of routes by issuing show ip route R01#show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set is subnetted, 3 subnets C is directly connected, Serial2/0 D [90/21024000] via, 00:11:22, Serial2/0 D [90/20514560] via, 00:11:15, Serial2/0 R01# Other usefull EIGRP commands: Show ip eigrp neighbors - displays adjacent neighbor routers Show ip eigrp topology - the EIGRP topology table (routes that are feasible successors and the possible paths)

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