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Cisco CCNA Certification Exam Tutorial: RIP Details You Must Know

RIP isn't exactly the most complex routing protocol on the CCNA exam, but that makes it easy to overlook some of the important details you must keep in mind in order to pass the exam! To help you review for the exam, here are just a few of those details!


RIPís default behavior is to send version 1 updates, but to accept both version 1 and 2 routing updates.


R2(config)#router rip


R2(config-router)#net 172.16.0.0


R2(config-router)#^Z


R2#show ip protocols


Routing Protocol is "rip"


Sending updates every 30 seconds, next due in 6 seconds


Invalid after 180 seconds, hold down 180, flushed after 240


Outgoing update filter list for all interfaces is


Incoming update filter list for all interfaces is


Redistributing: rip


Default version control: send version 1, receive any version


Interface Send Recv Key-chain


Serial0 1 1 2


By default, RIP v2 autosummarizes routing updates sent across classful network boundaries. To disable this behavior, run no auto-summary under the RIP process.


R1#conf t


R1(config)#router rip


R1(config-router)#version 2


R1(config-router)#no auto-summary


You do not specify a subnet mask or wildcard mask when configuring RIP Ė just the classful network, even if youíre running RIP v2.


R1#conf t


Enter configuration commands, one per line. End with CNTL/Z.


R1(config)#router rip


R1(config-router)#version 2


R1(config-router)#no auto-summary


R1(config-router)#network 172.10.0.0 ?



Debug ip rip displays the routing updates and metrics as the advertisements are sent and requested. To see this in action without waiting for the next regularly scheduled update, run clear ip route *.


R1#debug ip rip


RIP protocol debugging is on


R1#clear ip route *


01:16:54: RIP: sending v1 update to 255.255.255.255 via Loopback1 (1.1.1.1)


01:16:54: network 2.0.0.0, metric 2


01:16:54: network 3.0.0.0, metric 2


01:16:54: network 172.16.0.0, metric 1


01:16:54: network 10.0.0.0, metric 2


01:16:54: RIP: sending v1 update to 255.255.255.255 via Serial0 (172.16.123.1)


01:16:54: subnet 172.16.123.0, metric 1


01:16:54: network 1.0.0.0, metric 1


01:16:54: network 2.0.0.0, metric 2


01:16:54: network 3.0.0.0, metric 2


01:16:54: network 10.0.0.0, metric 2


To see only the routes discovered by a routing protocol, run show ip route followed by the name of the protocol:


R1#show ip route rip


R 2.0.0.0/8 [120/1] via 172.16.123.2, 00:00:26, Serial0


R 3.0.0.0/8 [120/1] via 172.16.13.2, 00:00:09, Serial1


[120/1] via 172.16.123.3, 00:00:09, Serial0


R 10.0.0.0/8 [120/1] via 172.16.13.2, 00:00:09, Serial1


[120/1] via 172.16.123.3, 00:00:09, Serial0


[120/1] via 172.16.123.2, 00:00:26, Serial0


And don't forget - to turn off all currently running debugs, run undebug all.


R1#undebug all


All possible debugging has been turned off


Don't overlook RIP and IGRP when it comes to the CCNA exam. OSPF and EIGRP are more complex to configure, but you need to understand how distance vector protocols work in order to pass the CCNA!


Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage, home of over 100 free certification exam tutorials, including Cisco CCNA certification test prep articles. His exclusive Cisco CCNA study guide and Cisco CCNA training is also available!


Visit his blog and sign up for Cisco Certification Central, a daily newsletter packed with CCNA, Network+, Security+, A+, and CCNP certification exam practice questions! A free 7-part course, "How To Pass The CCNA", is also available, and you can attend an in-person or online CCNA boot camp with The Bryant Advantage!


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