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Before learning about how to configure a dynamic routing protocol such as RIP, consider some basic configuration tasks that are required no matter what dynamic
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routing protocol you are running You need to perform two basic steps when setting up IP routing on your router:
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Enable the routing protocol Assign IP addresses to your router s interfaces
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Remember the two steps required to set up IP routing on a router
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Note that the order of these tasks is not important You already know how to configure an IP address on the router s interface: this was discussed in 16 The following sections cover the first bullet point in more depth
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The router Command
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Enabling an IP routing protocol is a two-step process First, you must go into Router Subconfiguration mode This mode determines the routing protocol that you ll be running Within this mode, you ll configure the characteristics of the routing protocol To enter the routing protocol s configuration mode, use the following command:
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Router(config)# router name_of_the_IP_routing_protocol Router(config-router)#
The router command is used to access the routing protocol that you want to configure; it doesn t enable it If you are not sure of the name of the routing protocol that you want to enable, use the context-sensitive help feature:
Router(config)# router bgp Border Gateway Protocol (BGP) eigrp Enhanced Interior Gateway Routing Protocol (EIGRP) isis ISO IS-IS iso-igrp IGRP for OSI networks mobile Mobile routes odr On Demand stub Routes ospf Open Shortest Path First (OSPF) rip Routing Information Protocol (RIP) Router(config)#
As you can see from the context-sensitive help output, you have a lot of IP routing protocols at your disposal
19: Basic Routing
One important item to point out is that the router command doesn t turn on the routing protocolThis process is done in the protocol s Router Subconfiguration mode, indicated by the (config-router) prompt
The network Command
Once in the routing protocol, you need to specify what interfaces are to participate in the routing process By default, no interfaces participate in the routing process To specify which interfaces will participate, use the network Router Subconfiguration mode command:
Router(config-router)# network IP_network_#
As soon as you enter a network number, the routing process becomes active For distance vector protocols such as RIP, you need to enter only the Class A, B, or C network number or numbers that are associated with your interface or interfaces In other words, if you have subnetted 19216810 with a subnet mask of 255255255192 (/26), and you have subnets 19216810/26, 192168164/26, 1921681128/26, and 1921681192/26, you don t need to enter each specific subnet Instead, just enter 19216810, and this will accommodate all interfaces that are associated with this Class C network If you specify a subnet, the router will convert it to the class address, because RIP is a classful protocol Let s take a look at a simple example of the configuration, shown in Figure 19-1 This example focuses on the configuration of the network commands, assuming
FIGURE 19-1
Simple network example
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that the routing protocol is a classful protocol, such as RIP In this example, the router is connected to a Class B network (1721600) and a Class C network (19216810), both of which are subnetted Assume that you forgot that you need to enter only the classful network numbers, and you entered the subnetted values instead, like this:
Router(config-router)# Router(config-router)# Router(config-router)# Router(config-router)# network network network network 1721610 1721620 192168164 1921681128
When entering your network statements, you need to include any network that is associated with your router s interfaces; if you omit a network, your router will not include the omitted interface in the routing process As you can see from the preceding example, all the subnets were included Remember, however, that the router requires only that you enter the class addresses If you were to execute a show running-config command, you would not see the four networks just listed, but only the Class B and C network numbers You shouldn t worry about this; it s just that you entered more commands than were necessary In reality, you needed to enter only these two network commands:
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