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When you earned your CCNA, you believed you learned everything there is to know about RIP. Close, but not rather There are some additional facts you want to know to pass the BSCI exam and get a single step closer to the CCNP exam, and one particular of these requires RIP update packet authentication. Youre familiar with some benefits of making use of RIPv2 over RIPv1, help for VLSM chief amongst them. But one particular benefit that you are not introduced to in your CCNA studies is the potential to configure routing update packet authentication. You have two options, clear text and MD5. To compare additional info, please check out open in a new browser window. Clear text is just that - a clear text password that is visible by any person who can pick a packet off the wire. If you are going to go to the difficulty of configuring update authentication, you must 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 need to the routers agree on the password, they must agree on the authentication strategy. 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#important chain RIP The key chain can have any name. R1config-keychain#key 1 Key chains can have multiple keys. Number them carefully when using multiples. R1config-keychain-crucial#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#key chain RIP R2config-keychain#essential 1 R2config-keychain-essential#essential-string CISCO R2config#int s0.123 R2config-subif#ip rip authentication mode text R2config-subif#ip rip authentication crucial-chain RIP R3#conf t R3config#important chain RIP R3config-keychain#crucial 1 R3config-keychain-crucial#crucial-string CISCO R3config#int s0.31 R3config-subif#ip rip authentication mode text R3config-subif#ip rip authentication key-chain RIP To use MD5 authentication rather than clear-text, basically 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.three on Ethernet0 3d04h 100.../eight via ... If you have an opinion about finance, you will seemingly need to check up about go there. in 1 hops 3d04h 150.1.two./24 by means of ... 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. To read additional info, we understand people have a gaze at perry belcher article. You will 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" may be a easy command as compared to the debugs for other protocols. To compare additional info, please check out perry belcher resources. but it really is also a quite strong debug. Start utilizing debugs as early as achievable in your Cisco studies to discover how router commands genuinely perform.