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When you earned your CCNA, you thought you learned anything there is to know about RIP. Discover more on mary manin morrissey by browsing our unusual website. Close, but not very! There are some added facts you need to know to pass the BSCI exam and get one particular step closer to the CCNP exam, and a single of these entails RIP update packet authentication. You happen to be familiar with some benefits of utilizing RIPv2 over RIPv1, assistance for VLSM chief among them. But a single advantage that you are not introduced to in your CCNA scientific studies is the ability to configure routing update packet authentication. You have two options, clear text and MD5. Clear text is just that - a clear text password that is visible by anybody who can pick a packet off the wire. Browse here at the link read this to compare when to allow for it. If you are going to go to the trouble of configuring update authentication, you ought to 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. Not only must the routers agree on the password, they should agree on the authentication method. If 1 router sends an MD5-hashed password to an additional router that is configured for clear-text authentication, the update will not be accepted. debug ip rip is a wonderful command for troubleshooting authenticated updates. R1, R2, and R3 are running RIP more than a frame relay cloud. Here is how RIP authentication would be configured on these 3 routers. R1#conf t R1config#essential chain RIP < The key chain can have any name. R1config-keychain#important 1 < Key chains can have multiple keys. If you think any thing, you will possibly require to learn about mary morrissey. Number them carefully when using multiples. R1config-keychain-key#key-string CISCO < This is the text string the key will use for authentication. R1config#int s0 R1config-if#ip rip authentication mode text < The interface will use clear-text mode. R1config-if#ip rip authentication key-chain RIP < The interface is using key chain RIP, configured earlier. R2#conf t R2config#important chain RIP R2config-keychain#key 1 R2config-keychain-crucial#key-string CISCO R2config#int s0.123 R2config-subif#ip rip authentication mode text R2config-subif#ip rip authentication essential-chain RIP R3#conf t R3config#crucial chain RIP R3config-keychain#important 1 R3config-keychain-important#key-string CISCO R3config#int s0.31 R3config-subif#ip rip authentication mode text R3config-subif#ip rip authentication crucial-chain RIP To use MD5 authentication rather than clear-text, simply replace the word text in the ip rip authentication mode command with md5. Heres what a successfully authentication RIPv2 packet looks like, courtesy of debug ip rip. Clear-text authentication is in effect and the password is cisco. 3d04h: RIP: received packet with text authentication cisco 3d04h: RIP: received v2 update from 150.1.1.3 on Ethernet0 3d04h: one hundred.../8 by means of ... Going To Myspace Codes - How Should You Employ Them certainly provides cautions you should use with your sister. in 1 hops 3d04h: 150.1.2./24 by means of ... in 1 hops Heres what it looks like when the remote device is set for MD5 authentication and the nearby router is set for clear-text. You are going to also see this message if the password itself is incorrect. 3d04h: RIP: ignored v2 packet from 150.1.1.3 invalid authentication Debug ip rip could be a basic command as compared to the debugs for other protocols. but its also a really effective debug. Begin making use of debugs as early as attainable in your Cisco research to understand how router commands really work!.