When you earned your CCNA, you thought you learned everything there is to know about RIP. Close, but not quite! There are some additional details you need to know to pass the BSCI exam and get one step closer to the CCNP exam, and one of those involves RIP update packet authentication.
Laptop Battery You're familiar with some advantages of using RIPv2 over RIPv1, support for VLSM chief among them. But one advantage that you're not introduced to in your CCNA studies is the ability to configure routing update packet authentication.
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Thinkpad You have two options, clear text and MD5. Clear text is just that - a clear text password that is visible by anyone who can pick a packet off the wire. If you're going to go to the trouble of configuring update authentication, you should use MD5. The MD stands for "Message Digest", and this is the algorithm that produces the hash value for the password that will be contained in the update packets.
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Microsoft Not only must the routers agree on the password, they must agree on the authentication method. If one router sends an MD5-hashed password to another router that is configured for clear-text authentication, the update will not be accepted. debug ip rip is a great command for troubleshooting authenticated updates.
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Laptop Computers R1, R2, and R3 are running RIP over a frame relay cloud. Here is how RIP authentication would be configured on these three routers.
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Laptop Computer R1#conf t
Occasionally, during your CCNA and CCNP studies, you'll run into a term that just doesn't quite make sense to you. (Okay, more than occasionally!) One such term is "reverse telnet". As a Cisco certification candidate, you know that telnet is simply a protocol that allows you to remotely connect to a networking device such as a router or switch. But what is "reverse telnet", CCNP home lab setup
Desktop Computer R1(config)#key chain RIP
Notebooks < The key chain can have any name. >
Lenovo R1(config-keychain)#key 1
Hard Drive < Key chains can have multiple keys. Number them carefully when using multiples. >
Travelstar R1(config-keychain-key)#key-string CISCO
Gateway < This is the text string the key will use for authentication. >
Laptop Parts
R1(config)#int s0
Software R1(config-if)#ip rip authentication mode text
Hard Drives < The interface will use clear-text mode. >
Electronics R1(config-if)#ip rip authentication key-chain RIP
Canon < The interface is using key chain RIP, configured earlier. >
Desktop Pc R2#conf t
Desktop Computers R2(config)#key chain RIP
Think Pad R2(config-keychain)#key 1
Repair R2(config-keychain-key)#key-string CISCO
Data Recovery R2(config)#int s0.123
Cisco R2(config-subif)#ip rip authentication mode text
Keyboard R2(config-subif)#ip rip authentication key-chain RIP
Monitor R3#conf t
Desktop R3(config)#key chain RIP
Infosys R3(config-keychain)#key 1
Refurbished Laptops R3(config-keychain-key)#key-string CISCO
Wipro R3(config)#int s0.31
Lap Top R3(config-subif)#ip rip authentication mode text
Refurbished R3(config-subif)#ip rip authentication key-chain RIP
Memory To use MD5 authentication rather than clear-text, simply replace the word "text" in the ip rip authentication mode command with md5.
Intel Here's what a successfully authentication RIPv2 packet looks like, courtesy of debug ip rip. Clear-text authentication is in effect and the password is "cisco".
As400 3d04h: RIP: received packet with text authentication cisco
Averatec 3d04h: RIP: received v2 update from 150.1.1.3 on Ethernet0
Hardware 3d04h: 100.0.0.0/8 via 0.0.0.0 in 1 hops
Dual Xeon 3d04h: 150.1.2.0/24 via 0.0.0.0 in 1 hops
Storage Here's what it looks like when the remote device is set for MD5 authentication and the local router is set for clear-text. You'll also see this message if the password itself is incorrect.
Seagate 3d04h: RIP: ignored v2 packet from 150.1.1.3 (invalid authentication)
Computer Sales "Debug ip rip" may be a simple command as compared to the debugs for other protocols. but it's also a very powerful debug. Start using debugs as early as possible in your Cisco studies to learn how router commands really work!
Computer Hardware
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