Cisco CCNP / BSCI Exam Tutorial: RIP Update Packet Authentication

Izvor: KiWi

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Inačica od 13:07, 8. veljače 2014.

When you earned your CCNA, you thought you learned every little thing there is to know about RIP. Close, but not very! There are some further particulars you require to know to pass the BSCI exam and get 1 step closer to the CCNP exam, and a single of those involves RIP update packet authentication. You're familiar with some benefits of employing RIPv2 more than RIPv1, assistance for VLSM chief among them. But one particular benefit that you're not introduced to in your CCNA scientific studies is the capacity 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 anyone who can choose a packet off the wire. Follow Mary Morrissey is a cogent resource for further concerning the purpose of it. Be taught new resources on an affiliated essay - Click this web page: mary morrissey post article. If you happen to be 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 creates 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 need to agree on the authentication strategy. If 1 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 operating RIP over a frame relay cloud. To get other viewpoints, please gaze at: mary morrissey post. Right here is how RIP authentication would be configured on these three routers. R1#conf t R1(config)#essential chain RIP < The key chain can have any name.> R1(config-keychain)#crucial 1 < Key chains can have multiple keys. Number them carefully when using multiples.> R1(config-keychain-key)#important-string CISCO < This is the text string the key will use for authentication.> R1(config)#int s0 R1(config-if)#ip rip authentication mode text < The interface will use clear-text mode.> R1(config-if)#ip rip authentication key-chain RIP < The interface is using key chain RIP, configured earlier.> R2#conf t R2(config)#key chain RIP R2(config-keychain)#important 1 R2(config-keychain-crucial)#crucial-string CISCO R2(config)#int s0.123 R2(config-subif)#ip rip authentication mode text R2(config-subif)#ip rip authentication key-chain RIP R3#conf t R3(config)#key chain RIP R3(config-keychain)#important 1 R3(config-keychain-key)#essential-string CISCO R3(config)#int s0.31 R3(config-subif)#ip rip authentication mode text R3(config-subif)#ip rip authentication essential-chain RIP To use MD5 authentication rather than clear-text, merely replace the word "text" in the ip rip authentication mode command with md5. Here's 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 by means of .. in 1 hops 3d04h: 150.1.2./24 by way of .. in 1 hops Here's what it looks like when the remote device is set for MD5 authentication and the local router is set for clear-text. To research additional information, you can have a peep at: mary morrissey site. You'll 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 basic command as compared to the debugs for other protocols. but it is also a really effective debug. Start utilizing debugs as early as attainable in your Cisco reports to understand how router commands actually operate!.

Cisco CCNP / BSCI Exam Tutorial: RIP Update Packet Authentication