Lab 21 - OSPF Path Influencing Using Bandwidth

Prerequisites: CCNP level skills.

Note!
Use OSPF point-to-multipoint on the Frame-Relay connections (configuration and topology from Lab20).

Topology

Pic. 1 - OSPF Topology.

Icons designed by: Andrzej Szoblik - http://www.newo.pl

Task 1

On R1 check the paths towards 10.1.23.0/24.

Task 2
Manipulate the OSPF bandwidth so R1 prefers R3 towards 10.1.23.0/24.

Lab Solution

Task 1
On R1 check the paths towards 10.1.23.0/24.

Pic. 2 - R1's Routing Table.

Note!
R2 is the DR on 10.1.23.0 segment. Both R2 and R3 are advertising the subnet.

Note!
Both R2 and R3 calculate the cost of 10.1.23.0/24 based on the bandwidth (100Mbps). The cost is: 1.

Task 2

Manipulate the OSPF bandwidth so R1 prefers R3 towards 10.1.23.0/24.

R2 Configuration:

!

interface FastEthernet1/0
 bandwidth 10000
 ip address 10.1.23.2 255.255.255.0

!

Verification:

Pic. 3 - R2's cost is changed from 1 to 10.

Pic. 4. - R1's Routing Table.