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This case study is a
classic for those making the transition from RIP to OSPF. It has
become extremely popular within networking circles. It has been
modified and updated slightly, but otherwise the original text and
message is identical to when it was a Cisco case study.
This case study
addresses the issue of integrating RIP networks with OSPF networks.
Most OSPF networks also use RIP to communicate with hosts or to
communicate with portions of the internetwork that do not use OSPF.
Cisco supports both
the RIP and OSPF protocols and provides a way to exchange routing
information between RIP and OSPF networks. This case study provides
examples of how to complete the following phases in redistributing
information between RIP and OSPF networks:
- Configuring a RIP
network
- Adding OSPF to the
center of a RIP network
- Adding OSPF areas
- Setting up mutual
distribution
Figure
illustrates a RIP network. Three sites are connected with serial
lines. The RIP network uses a Class B address and an 8-bit subnet
mask. Each site has a contiguous set of network numbers.
Figure
lists the
network address assignments for the RIP network, including the
network number, subnet range, and subnet masks. All interfaces
indicate network 130.10.0.0; however, the specific address includes
the subnet and subnet mask. For example, serial interface 0 on
router C has an IP address of 130.10.63.3 with a subnet mask of
255.255.255.0.
RIP network
assignments.
Configuration File
Examples
The
commands in the configuration file for router A determine the IP
address for each interface and enable RIP on those interfaces. (see
RouterA#show
running-config
command output).
The
commands in the configuration file for router B determine the IP
address for each interface and enable RIP on those interfaces (see
RouterB#show
running-config
command output).
The
commands in the configuration file for router C determine the IP
address for each interface and enable RIP on those interfaces. (see
RouterC#show
running-config
command output).
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