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Configuring RIP Interfaces

RIP interfaces are configured for a number of settings, including the protocol type used for outgoing packets and whether your router accepts routes from all its neighbors (other nearby routers). To configure an interface for RIP, follow these steps:

1. Right-click the RIP node (under the IP node in the snap-in tree) and select New Interface. The New Interface for RIP dialog box opens.

Figure 18.9. RIP runs on the interface you select.

2. In the New Interface for RIP Version 2 for Internet Protocol dialog box, select the interface for the protocol.

3. Click OK. The RIP Properties dialog box for the interface that you selected appears (see Figure 18.10).

Figure 18.10. The RIP Properties dialog box for the interface.

4. On the General tab (see Figure 18.10), the operation mode is set to periodic update by default (and should be left as the default). You can change the RIP version that is used for outgoing and incoming packets. RIP Version 2 broadcast is the default for outgoing packets, but you can use the drop-down list to select RIP Version 1 if this is running on other routers on the network. You can also choose to have the router listen to other routers (to build a routing table) but not advertise to its neighbors; this selection is Silent RIP.

5. The Incoming Packet Protocol drop-down list is used to specify the types of RIP packets that the interface accepts. You can choose to accept RIP Version 1, 2, or both types of packets.

6. To change security settings for the RIP interface, select the Security tab. You can see actions related to incoming and outgoing routes. You can choose to accept all routes, accept routes listed in a range, or ignore routes listed in a range.

7. To change settings related to the router’s neighboring routers, click the Neighbors tab (see Figure 18.11).

Figure 18.11. How the router interacts with neighboring routers is configured on the Neighbors tab.

8. By default, the router uses broadcast multicast messages to contact its neighbors. You can specify that unicast messages go to certain routers, either in addition to or instead of broadcast or multicast messages. Select either the option Use Neighbors in Addition to Broadcast or Multicast or the option Use Neighbors Instead of Broadcast or Multicast. Then add the IP addresses of the neighbors to the IP Address box.

9. To set advanced features, select the Advanced tab on the dialog box. Most of these settings should remain the defaults, although you can change the periodic announcement interval for the router. Split-horizon processing, which is enabled by default, helps to negate routing loops on the network. Routing loops happen because certain routes become unavailable and the routers do not have updated routing tables; data just continues to loop around the internetwork. Poison-reverse processing “poisons” (marks for deletion) routes that have not been verified by a neighboring router.

10. When you have completed setting the configuration for the RIP interface, click OK.

The interface appears in the Details pane when you select the RIP node in the snap-in tree. You can add other interfaces as needed for RIP and configure them.

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