RIP and OSPF Redistribution

Kyon

RIP and OSPF Redistribution

This case study addresses the issue of integrating Routing Information Protocol (RIP) networks with Open Shortest Path First (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, including the following topics:

• Configuring a RIP Network
  
  
• Adding OSPF to the Center of a RIP Network
  
  
• Adding OSPF Areas
  
  
• Setting Up Mutual Redistribution
  
  

Configuring a RIP Network

Figure 14-1 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 14-1: A RIP network.

                               
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Table 14-1 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.

Table 14-1: RIP Network Address Assignments

Network Number	Subnets	Subnet Masks
130.10.0.0	Site A: 8 through 15	255.255.255.0
130.10.0.0	Site B: 16 through 23	255.255.255.0
130.10.0.0	Site C: 24 through 31	255.255.255.0
130.10.0.0	Serial Backbone: 62 through 64	255.255.255.0

Configuration File Examples

The following commands in the configuration file for Router A determine the IP address for each interface and enable RIP on those interfaces:

interface serial 0ip address 130.10.62.1 255.255.255.0interface serial 1ip address 130.10.63.1 255.255.255.0interface ethernet 0ip address 130.10.8.1 255.255.255.0interface tokenring 0ip address 130.10.9.1 255.255.255.0router ripnetwork 130.10.0.0The following commands in the configuration file for Router B determine the IP address for each interface and enable RIP on those interfaces:
interface serial 0ip address 130.10.62.2 255.255.255.0interface serial 1ip address 130.10.64.2 255.255.255.0interface ethernet 0ip address 130.10.17.2 255.255.255.0interface tokenring 0ip address 130.10.16.2 255.255.255.0router ripnetwork 130.10.0.0

The following commands in the configuration file for Router C determine the IP address for each interface and enable RIP on those interfaces:

interface serial 0ip address 130.10.63.3 255.255.255.0interface serial 1ip address 130.10.64.3 255.255.255.0interface ethernet 0ip address 130.10.24.3 255.255.255.0router ripnetwork 130.10.0.0Easyinlab Welcome