Cisco CCNA Study Guide - Router Alley

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CCNA Study Guide v2.62 – Aaron Balchunas 210 Configuring Basic EIGRP Routing protocol configuration occurs in Global Configuration mode. On Router A, to configure EIGRP, we would type: RouterA(config)# router eigrp 10 RouterA(config-router)# network 172.16.0.0 RouterA(config-router)# network 10.0.0.0 The first command, router eigrp 10, enables the EIGRP process. The “10” indicates the Autonomous System number that we are using. The Autonomous System number can range from 1 to 65535. Only other EIGRP routers in Autonomous System 10 will form neighbor adjacencies and share updates with this router. The network statements serve two purposes in EIGRP: • First, they identify which networks you wish to advertise to other EIGRP routers (similar to RIP). • Second, they identify which interfaces on the local router to attempt to form neighbor relationships out of (similar to OSPF). Prior to IOS version 12.0(4), the network statements were classful, despite the fact that EIGRP is a classless routing protocol. For example, the above network 10.0.0.0 command would advertise the networks of directlyconnected interfaces belonging to the 10.0.0.0/8 network and its subnets. It would further attempt to form neighbor relationships out of these interfaces. IOS version 12.0(4) and later provided us with more granular control of our network statements. It introduced a wildcard mask parameter, which allows us to choose the networks to advertise in a classless fashion: RouterA(config)# router eigrp 10 RouterA(config-router)# network 172.16.0.0 0.0.255.255 RouterA(config-router)# network 10.1.4.0 0.0.0.255 * * * All original material copyright © 2013 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
CCNA Study Guide v2.62 – Aaron Balchunas 211 EIGRP Passive Interfaces It is possible to control which router interfaces will participate in the EIGRP process. Just as with RIP, we can use the passive-interface command. However, please note that the passive-interface command works differently with EIGRP than with RIP or IGRP. EIGRP will no longer form neighbor relationships out of a “passive” interface, thus this command prevents updates from being sent or received out of this interface: RouterC(config)# router eigrp 10 RouterC(config-router)# network 10.4.0.0 RouterC(config-router)# network 10.2.0.0 RouterC(config-router)# passive-interface s0 Router C will not form a neighbor adjacency with Router B. We can configure all interfaces to be passive using the passive-interface default command, and then individually use the no passive-interface command on the interfaces we do want neighbors to be formed on: RouterC(config)# router eigrp 10 RouterC(config-router)# network 10.4.0.0 RouterC(config-router)# network 10.2.0.0 RouterC(config-router)# passive-interface default RouterC(config-router)# no passive-interface e0 Always remember, that the passive-interface command will prevent EIGRP (and OSPF) from forming neighbor relationships out of that interface. No routing updates are passed in either direction. * * * All original material copyright © 2013 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
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