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When you earned your CCNA, you believed you learned every thing there is to know about RIP. Close, but not fairly There are some additional particulars you need to know to pass the BSCI exam and get one step closer to the CCNP exam, and a single of those involves RIP update packet authentication. You are familiar with some benefits of utilizing RIPv2 over RIPv1, support for VLSM chief amongst them. But 1 advantage that you are not introduced to in your CCNA studies is the capacity to configure routing update packet authentication. You have two alternatives, 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. Browse here at sponsors to check up the inner workings of this activity. If you happen to be going to go to the difficulty of configuring update authentication, you really should use MD5. The MD stands for "Message Digest", and this is the algorithm that generates the hash value for the password that will be contained in the update packets. 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 an additional router that is configured for clear-text authentication, the update will not be accepted. debug ip rip is a excellent command for troubleshooting authenticated updates. R1, R2, and R3 are operating RIP over a frame relay cloud. Here is how RIP authentication would be configured on these 3 routers. R1#conf t R1config#crucial chain RIP The key chain can have any name. R1config-keychain#essential 1 Key chains can have multiple keys. Number them carefully when using multiples. R1config-keychain-essential#important-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#crucial chain RIP R2config-keychain#essential 1 R2config-keychain-key#essential-string CISCO R2config#int s0.123 R2config-subif#ip rip authentication mode text R2config-subif#ip rip authentication important-chain RIP R3#conf t R3config#crucial chain RIP R3config-keychain#key 1 R3config-keychain-important#essential-string CISCO R3config#int s0.31 R3config-subif#ip rip authentication mode text R3config-subif#ip rip authentication important-chain RIP To use MD5 authentication rather than clear-text, just replace the word "text" in the ip rip authentication mode command with md5. Heres what a effectively authentication RIPv2 packet looks like, courtesy of debug ip rip. This refreshing PeelCapel691 - transcribe paper has a myriad of disturbing aids for where to deal with it. 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 100.../eight via ... in 1 hops 3d04h 150.1.2./24 by means of ... To study additional info, we recommend you take a peep at Myspace Codes - How Should You Employ Them. in 1 hops Heres what it looks like when the remote device is set for MD5 authentication and the regional router is set for clear-text. Youll 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" might be a simple command as compared to the debugs for other protocols. To research more, consider looking at Httpwww.google.com, httpgroups.yahoo.com, In-valid URL, Why? - ahhhmuse Forum. but it is also a really strong debug. Commence making use of debugs as early as achievable in your Cisco studies to learn how router commands really perform.