Lab 5.1.2.2 Bandwidth

Objective:

Configure OSPF to calculate the correct cost of an interface.

Scenario:

The BubbaGump ISP has reported an issue with their OSPF WAN metrics. There is only a 56KB line on the serial link; however, the link is being reported as a T-1 metric. This must be fixed by you.

From the "Router B" console

1. Enter show ip ospf interface

What is the cost of interface Serial 0/0 ?

2. To change the cost issue the following commands:

  • router-b(config)#interface serial 0/0
  • router-b(config-if)#bandwidth 56
  • router-b(config-router)#^Z

From the "Router C" console

3. Enter show ip ospf interface

What is the cost of interface Serial 0/0 ?

4. To change the cost issue the following commands:

  • router-c(config)#interface serial 0/0
  • router-c(config-if)#bandwidth 56
  • router-c(config-router)#^Z

5. Enter show ip ospf interface

What is the new cost of interface Serial 0/0 ?

If uncorrected what will OSPF default the cost of a serial interface?