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19: Basic Routing
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IP RIPv1, a classful protocol, broadcasts updates every 30 seconds and has a hold-down period of 180 seconds Hop count is used as a
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metric: the path or paths with the least accumulated hop count are used and placed in the routing table
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One thing you should keep in the back of your mind when dealing with RIPv2 is that it is based on RIPv1 and is, at heart, a distance vector protocol with routing enhancements built into it Therefore, it is commonly called a hybrid protocol You read about some of the characteristics that both versions of RIP have in common in the preceding section This section focuses on the characteristics unique to RIPv2 One major enhancement to RIPv2 pertains to how it deals with routing updates Instead of using broadcasts, RIPv2 uses multicasts: updates are advertised to 224009, which all RIPv2 routers will process And to speed up convergence, RIPv2 supports triggered updates when a change occurs, a RIPv2 router will immediately propagate its routing information to its connected neighbors A second major enhancement in RIPv2 is that it is a classless protocol RIPv2 supports variable-length subnet masking (VLSM), which allows you to use more than one subnet mask for a given class network number VLSM allows you to maximize the efficiency of your addressing design as well as summarize routing information to create very large, scalable networks VLSM is discussed in 8 As a third enhancement, RIPv2 supports authentication You can restrict what routers you want to participate in RIPv2 This is accomplished using a clear-text or hashed password value Cisco hash values aren t the most secure security measures on the planet, and cracking any password assigned to a Cisco device is relatively easy (even MD5 with a password cracking program) You should still assign these kinds of passwords as an added level of security, but don t rely on them totally: physical security is still paramount
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Even with all of its advanced characteristics, RIPv2 is still, at heart, a distance vector protocol It uses hop count as a metric, supports the same solutions to solve routing loop problems, has a 15-hop count limit, and shares other characteristics of RIPv1 RIPv2 is a hybrid protocol, based on RIPv1 It uses multicasts to disseminate routing information and
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supports triggered updates Unlike RIPv1, RIPv2 supports VLSM (advertises subnet masks with associated network numbers), which allows you to summarize routing information, and authentication of routing updates Otherwise, its characteristics are like those of RIPv1
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As you will see in this section, configuring RIP is an easy and straightforward process The basic configuration of RIP involves the following two commands:
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Router(config)# router rip Router(config-router)# network IP_network_#
As explained in the preceding section, RIPv1 is classful and RIPv2 is classless However, whenever you configure either version of RIP, the network command assumes classful: You need to enter only the Class A, B, or C network number, not the subnets, as was discussed earlier in this chapter If you refer back to Figure 19-1, the router s RIPv1 configuration would look like this:
Router(config)# router rip Router(config-router)# network 1721600 Router(config-router)# network 19216810
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Use the router rip and network commands to con gure RIP routing Remember to put the class address
(not the subnetted network number) in the network statement
19: Basic Routing
Specifying RIP Version 1 and 2
By default, the IOS accepts both RIPv1 and RIPv2 routing updates; however, it generates only RIPv1 updates You can configure your router to
accept and send RIPv1 only accept and send RIPv2 only use a combination of the two, depending on your interface configuration
To accomplish either of the first two items in the list, you need to set the version in your RIP configuration:
Router(config)# router rip Router(config-router)# version 1|2
When you specify the appropriate version number, your RIP routing process will send and receive only the version packet type that you configured You can also control which version of RIP is running on an interface-by-interface basis For instance, suppose a bunch of new routers at your site support both versions and a remote office understands only RIPv1 In this situation, you can configure your routers to generate RIPv2 updates on all their LAN interfaces, but for the remote access connection at the corporate site, you could set the interface to run only RIPv1 To control which version of RIP should handle generating updates on an interface, use the following configuration:
Router(config)# interface type [slot_#/]port_# Router(config-router)# ip rip send version 1 | version 2 | version 1 2
With the ip rip send command, you can control which version of RIP the router should use on the specified interface when generating RIP updates You can be specific by specifying version 1 or 2, or you can specify both To control what version of RIP should be used when receiving RIP updates on a particular interface, use the following configuration:
Router(config)# interface type [slot_#/]port_# Router(config-router)# ip rip receive version 1 | version 2 | version 1 2
Unless you need to run RIPv1 because of backward compatibility with an older router or host running RIP, you should use version 2 because of some of its enhancements over version 1, such as classless routing, multicasts, and triggered updates
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