CCNP Routing Study Guide- P7

CCNP Routing Study Guide- P7: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.
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CCNP Routing Study Guide- P7 Configuring OSPF 143 RouterB(config-if)#router ospf 1 RouterB(config-router)#neighbor 172.16.25.10 priority 1 RouterB(config-router)#neighbor 172.16.25.11 priority 1 RouterB(config-router)#neighbor 172.16.25.12 priority 1 RouterB(config-router)#network 172.16.25.0 0.0.0.255 area 0 RouterB(config-router)#^Z RouterB# Point-to-Multipoint This configuration does away with the assumption that there are PVCs con- figured for all routers creating a full mesh. The same ip ospf network broadcast command is used to specify that the network type is point-to- multipoint non-broadcast. This tells the router that no DR/BDR needs to be elected and that the interfaces are treated as individual point-to-point links. Here is a sample configuration: RouterC#conf t Enter configuration commands, one per line. End with CNTL/Z. RouterC(config)#interface serial2 RouterC(config-if)#ip ospf network point-to-multipoint non-broadcast RouterC(config-if)#encapsulation frame-relay ietf RouterC(config-if)#frame-relay local dlci 300 RouterC(config-if)#frame-relay map ip 172.16.26.12 312 broadcast RouterC(config-if)#frame-relay map ip 172.16.26.13 313 broadcast RouterC(config-if)#router ospf 1 RouterC(config-router)#neighbor 172.16.26.12 priority 1 RouterC(config-router)#neighbor 172.16.26.13 priority 1 RouterC(config-router)#network 172.16.25.0 0.0.0.255 area 0 RouterC(config-router)#^Z RouterC# Copyright ©2001 SYBEX , Inc., Alameda, CA www.sybex.com 144 Chapter 4 OSPF Areas Once the configuration has been created, it is time to test it and make sure it works. There are several show commands that facilitate this task, and we discuss them in the following section. Verifying OSPF Configuration This section describes several ways in which to verify proper OSPF configu- ration and operation. Table 4.5 contains a list of OSPF show commands. TABLE 4.3 OSPF Show Commands Command Description show ip ospf Summarizes all relative OSPF information, such as OSPF processes, Router ID, area assignments, authentication, and SPF statistics. show ip ospf Shows the same information as the show ip ospf process-id command, but only for the specified process. show ip ospf Displays the Router IDs of all ABRs and ASBRs border-routers within the autonomous system. show ip ospf Displays the link-state database. database show ip ospf Displays interface OSPF parameters and other interface OSPF information specific to the interface. show ip ospf Displays each OSPF neighbor and adjacency neighbor status. show ip ospf This command is used to display OSPF information for one or all OSPF pro- cesses running on the router. Information contained therein includes the Router ID, area information, SPF statistics, and LSA timer information. Here is a sample output: RouterA#sho ip ospf Routing Process ospf 1 with ID 172.16.240.1 Supports only single TOS(TOS0) routes Copyright ©2001 SYBEX , Inc., Alameda, CA www.sybex.com Configuring OSPF 145 SPF schedule delay 5 secs, Hold time between two SPFs 10 secs Number of DCbitless external LSA 0 Number of DoNotAge external LSA 0 Number of areas in this router is 1. 1 normal 0 stub 0 nssa Area BACKBONE(0) Number of interfaces in this area is 3 Area has no authentication SPF algorithm executed 17 times Area ranges are Link State Update Interval is 00:30:00 and due in 00:17:52 Link State Age Interval is 00:20:00 and due in 00:07:52 Number of DCbitless LSA 0 Number of indication LSA 0 Number of DoNotAge LSA 0 RouterA# show ip ospf border-routers This command displays the process ID on the router, the route to the ABR or ASBR, and the SPF information. Here is a sample output: RouterC#show ip ospf border-routers OSPF Process 1 internal Routing Table Codes: i - Intra-area route, I - Inter-area route i 172.16.240.1 [65] via 172.16.1.106, Serial1, ABR, Area 0, SPF 582 i 172.16.241.1 [65] via 172.16.1.94, Serial11, ASBR, Area 0, SPF 582 RouterC# Copyright ©2001 SYBEX , Inc., Alameda, CA www.sybex.com 146 Chapter 4 OSPF Areas This is a simple output that shows only one ABR and one ASBR. In order to have an ABR, you must have multiple areas configured. In order to have an ASBR, ...