Cisco CCNA Tutorial:
RIP Test Prep Tips
This tutorial valid for both the 640-802 and 200-120 CCNA exams!
By Chris Bryant, CCIE #12933
In your CCNA exam studies, it's easy to overlook RIP in the big scheme of things. OSPF has many more details, as does EIGRP - but RIP has some details you must know in order to pass the Cisco CCNA exam.
RIP is also a very popular network routing protocol, so you need to know about this important protocol for use in real-world networks as well! Here are eight CCNA exam tips to help you in your test prep!
Tip #1: RIP's default behavior is to send version 1 updates only, but to accept both versions 1 and 2.
To be frank, this is a strange little default, but to be even more frank, you better know this! The all-purpose command show ip protocols bears this out:
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
#2: One RIP version 2 default behavior is to autosummarize routes advertised across classful boundaries. To disable this behavior, run the no auto-summary command under the RIP process.
#3: To hardcode RIP to send and receive only version 1 or version 2, run the appropriate version command under the RIP process. An example of both of these tips is shown below.
R1#conf t
R1(config)#router rip
R1(config-router)#version 2
R1(config-router)#no auto-summary
Tip #4: RIP version 2 supports variable-length subnet masking (VLSM), but you still enter the classful network number under the RIP process.
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
More tips right after this important message about the changing CCNA exams!
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Tip #5: To see the routes being advertised in RIP updates and the metrics of these routes, run debug ip rip.
Tip #6: To see these updates immediately after turning the debug on, run clear ip route * to clear the routing table of its dynamic routes.
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
Tip #7: If you want to see only a certain kind of route from the entire routing table, run show ip route followed by the protocol or route type (static, for example).
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
Tip #8: Don't forget to turn your debugs off when you're done! To turn all debugs off at once, run undebug all. To turn off individual debugs, run the command no debug followed by the type of debug you want to turn off - no debug ip rip, for example.
R1#undebug all
All possible debugging has been turned off
One more success tip - visit my Cisco CCNA/CCNP Tutorials page for over 400 more Cisco training articles, videos, and more!
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GUARANTEED!
If you don't pass for any reason before September 30, 2013, you will receive full and free access to the all-new Video Boot Camp I'm creating for the 200-101 CCNA exam!
Click that link or this banner and let's get started on your CCNA --- with my $44 CCNA Video Boot Camp!
To your success,
Chris Bryant
CCIE #12933
chris@thebryantadvantage.com
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