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When you earned your CCNA, you thought you learned every little thing there is to know about RIP. Dig up extra information on the affiliated website - Click this link url. Close, but not very There are some additional specifics you need to have to know to pass the BSCI exam and get a single step closer to the CCNP exam, and a single of these includes RIP update packet authentication. You happen to be familiar with some benefits of utilizing RIPv2 over RIPv1, support for VLSM chief among them. But one advantage that you happen to be not introduced to in your CCNA reports is the capacity to configure routing update packet authentication. You have two possibilities, clear text and MD5. Clear text is just that - a clear text password that is visible by anyone who can choose a packet off the wire. If you are going to go to the difficulty 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 should the routers agree on the password, they have to agree on the authentication approach. Visiting mary morrissey articles perhaps provides suggestions you can tell your family friend. If one router sends an MD5-hashed password to one more 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. 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#crucial chain RIP The key chain can have any name. R1config-keychain#crucial 1 Key chains can have multiple keys. Number them carefully when using multiples. R1config-keychain-important#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 important-chain RIP The interface is using key chain RIP, configured earlier. R2#conf t R2config#essential chain RIP R2config-keychain#crucial 1 R2config-keychain-essential#important-string CISCO R2config#int s0.123 R2config-subif#ip rip authentication mode text R2config-subif#ip rip authentication key-chain RIP R3#conf t R3config#essential chain RIP R3config-keychain#crucial 1 R3config-keychain-important#key-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, merely 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. 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.../8 via ... in 1 hops 3d04h 150.1.2./24 via ... 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" could be a easy command as compared to the debugs for other protocols. Visit https://plus.google.com/u/0/108662500379091383331/posts/2td8zqqnnjk to discover why to do this belief. but it is also a very effective debug. Identify further on our favorite related link by clicking the best. Start using debugs as early as feasible in your Cisco scientific studies to understand how router commands truly work.