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CCNP Routing Study Guide- P8

CCNP Routing Study Guide- P8:T his book is intended to help you continue on your exciting new path toward obtaining your CCNP and CCIE certification. Before reading this book, it is important to have at least read the Sybex CCNA: Cisco Certified Network Associate Study Guide, Second Edition. You can take the CCNP tests in any order, but you should have passed the CCNA exam before pursuing your CCNP. | Basic Multi-area Configuration 173 RouterB interface Ethernet0 ip address 1.1.3.1 255.255.255.0 interface Ethernet1 ip address 1.1.2.2 255.255.255.0 router ospf 70 network 1.1.2.0 0.0.0.255 area 0 network 1.1.3.0 0.0.0.255 area 1 RouterC interface Ethernet0 ip address 1.1.4.1 255.255.255.0 interface Ethernet1 ip address 1.1.3.2 255.255.255.0 router ospf 70 network 1.1.3.0 0.0.0.255 area 1 network 1.1.4.0 0.0.0.255 area 1 Let s examine the syntax to configure OSPF on RouterA. First we need to enable the OSPF process on the router RouterA config router ospf 70 where 70 is the Process ID. Next we need to identify each of the networks connected to the router that we want to participate in the OSPF process. In this example we have two networks connected to RouterA 1.1.1.0 24 and 1.1.2.0 24 RouterA config-router network 1.1.1.0 0.0.0.255 area 0 where 1.1.1.0 0.0.0.255 is the network and wildcard mask of a network connected to RouterA and where 0 is the area that network 1.1.1.0 24 is a member of. RouterA config-router network 1.1.2.0 0.0.0.255 area 0 Copyright 2001 SYBEX Inc. Alameda CA www.sybex.com 174 Chapter 5 Interconnecting OSPF Areas The syntax for RouterB is similar to that used for RouterA. The primary difference is that RouterB is connected to two areas RouterB config router ospf 70 RouterB config-router network 1.1.2.0 0.0.0.255 area 0 RouterB config-router network 1.1.3.0 0.0.0.255 area 1 The syntax for RouterC is very similar to that of RouterA. The difference is that RouterA is internal to Area 0 thereby classifying it as a backbone router RouterC config router ospf 70 RouterC config-router network 1.1.3.0 0.0.0.255 area 1 RouterC config-router network 1.1.4.0 0.0.0.255 area 1 Stub Area Configuration 5ince the main purpose of having stub areas and totally stubby areas is to keep such areas from carrying external routes we need to review some design guidelines before configuring a stub area or a totally stubby area Do not make the backbone area Area 0 a stub