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18 Cards in this Set

  • Front
  • Back
To configure OSPF as the routing protocol
Router(config)#router ospf process-number
Defining a network on an area
Router(config-router)#network network-number wildcard-mask area area-number
how many bits in the area field?
What is the RID used for?
The RID is used to identify the source of LSA updates as shown in the OSPF database.
how do you configure the RID?
Router(config)#router ospf
Router(config-router)# router-id ip-address
how do you configure Loop back
Router(config)# interface loopback interface-number
Router(config-if)# ip address ip-address subnet-mask
Changing the Default Metric
Router(config-if)# ip ospf cost cost
What's the default cost of a T1 (1.544 Mbps)
what has default cost of 1?
how do you change the way OSPF calculates default metrics for the interface.
Router(config-router)# ospf auto-cost reference-bandwidth reference-bandwidth
what is the range of reference bandwidth?
The range is 1 to 4,294,967;
Reasons for using the cost option in OSPF include the following:
— 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
Reasons for increasing the router priority include the following:
■ 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.
The choice of which technology is to be implemented, whether you are using point-to-point or point-to-multipoint is:
Router(config-if)#ip ospf network {broadcast | non-broadcast| {point-to-multipoint
to configure a DR or BDR, Configuring a neighbor is done by:
Router(config-if)#neighbor ip-address [priority number ] [poll-interval sec]
[cost number]
what is the importance of the priority field? how many bits? what is the default value?
An 8-bit number indicating the likelihood of the neighbor being elected as the BDR or the DR. The default is 0.
what is the default value of the "poll interval" field?
what is the range of the cost?
integer from 1 - 65,535.