Foundation Summary


The "Foundation Summary" section of each chapter lists the most important facts from the chapter. Although this section does not list every fact from the chapter that will be on your exam, a well-prepared candidate should, at a minimum, know all the details in each "Foundation Summary" before going to take the exam.

The following is a list of the commands explained in this chapter. This list is not intended to teach the use of the commands, but to remind you of the options available.

The commands in Table 7-12 are configuration commands.

Table 7-12. OSPF Configuration Command Summary



router ospf process-number

Turns on the OSPF process and identifies it with a process ID.

network network-number wildcard-mask area area-number

Identifies which networksand, thus, interfacesbelong to which area.

interface loopback interface-number

Creates the loopback interface that can now be used to create the RID.

ip ospf cost cost

Sets the cost or metric for the outgoing interface.

auto-cost reference-bandwidth reference-bandwidth

Allows the administrator to change the formula used to calculate the metric.

ip ospf priority number

Helps to determine which router on a multiaccess network will be elected as the DR.

ip ospf network network-type

Identifies the type of network to the OSPF process, which will determine how the adjacencies are created.

neighbor ip-address [ priority number ] [ poll-interval sec ] [ cost number ]

States the neighbor, its address, and its capability to become the DR. This command also allows the configuration of cost and the timers on the interface.

router-id ip-address

Used to define the RID of the router.

Table 7-13. The show Command Options for OSPF

Command Option


show ip ospf

Shows the OSPF process and its details, for example, how many times the router has recalculated its routing table.

show ip ospf database

Shows the contents of the topological database.

show ip ospf interface

Gives information about how OSPF has been configured on each interface. Typing errors are easily seen with this command.

show ip ospf neighbor

Displays all the information about the relationship that the router has with its neighborsfor example, the status of communication. One of the main points of interest is whether all the neighbors are present in the table.

show ip protocols

Enables you to view the IP routing protocol configuration on the router.

show ip route

Shows detailed information about the networks of which the router is aware and the preferred paths to those networks. Also gives the next logical hop as the next step in the path .

The debug commands are EXEC commands. The options available for monitoring OSPF are listed in Table 7-14.

Table 7-14. The debug Command Options for OSPF

Command Option


Debug ip ospf events

Displays information about OSPF- related events, such as adjacencies, flooding information, DR selection, and shortest path first (SPF) calculation.

debug ip packet

IP debugging information includes packets received, generated, and forwarded. Fast-switched packets do not generate messages.

CCNP BSCI Exam Certification Guide
CCNP BSCI Exam Certification Guide (CCNP Self-Study, 642-801) (3rd Edition)
ISBN: 1587200856
EAN: 2147483647
Year: 2002
Pages: 194
Authors: Clare Gough © 2008-2017.
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