Configuring Ospf In A Single Area

Front 1

To configure OSPF as the routing protocol

Back 1

Router(config)#router ospf process-number

Front 2

Defining a network on an area

Back 2

Router(config-router)#network network-number wildcard-mask area area-number

Front 3

how many bits in the area field?

Back 3

32

Front 4

What is the RID used for?

Back 4

The RID is used to identify the source of LSA updates as shown in the OSPF database.

Front 5

how do you configure the RID?

Back 5

Router(config)#router ospf
Router(config-router)# router-id ip-address

Front 6

how do you configure Loop back

Back 6

Router(config)# interface loopback interface-number
Router(config-if)# ip address ip-address subnet-mask

Front 7

Changing the Default Metric

Back 7

Router(config-if)# ip ospf cost cost

Front 8

What's the default cost of a T1 (1.544 Mbps)

Back 8

64

Front 9

what has default cost of 1?

Back 9

FDDI

Front 10

how do you change the way OSPF calculates default metrics for the interface.

Back 10

Router(config-router)# ospf auto-cost reference-bandwidth reference-bandwidth

Front 11

what is the range of reference bandwidth?

Back 11

The range is 1 to 4,294,967;

Front 12

Reasons for using the cost option in OSPF include the following:

Back 12

— You want to maintain interoperability among different vendors running OSPF.
— There is a design reason to choose a different path than the one selected by the Cisco
default metric
— You want to allow greater granularity in the application of the cost metric

Front 13

Reasons for increasing the router priority include the following:

Back 13

■ The router has greater CPU and memory
■ The router is the most reliable router
■ All the other routers on the LAN connect to stub networks.
■ There are point-to-multipoint connections in an NBMA cloud, and the hub router needs to be
configured as the centralized resource, requiring it to be the DR.
■ The router is an ABR, and you do not want it to consume more resources as a DR, so another router on the subnet either has its priority increased or the ABR has its priority decreased.

Front 14

The choice of which technology is to be implemented, whether you are using point-to-point or point-to-multipoint is:

Back 14

Router(config-if)#ip ospf network {broadcast | non-broadcast| {point-to-multipoint
[non-broadcast]}}

Front 15

to configure a DR or BDR, Configuring a neighbor is done by:

Back 15

Router(config-if)#neighbor ip-address [priority number ] [poll-interval sec]
[cost number]

Front 16

what is the importance of the priority field? how many bits? what is the default value?

Back 16

An 8-bit number indicating the likelihood of the neighbor being elected as the BDR or the DR. The default is 0.

Front 17

what is the default value of the "poll interval" field?

Back 17

120s

Front 18

what is the range of the cost?

Back 18

integer from 1 - 65,535.