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03.31.06
Cisco CCNP / BCSI Exam Tutorial: Configuring EIGRP Packet Authentication
 By
Chris Bryant
Configuring RIPv2 and EIGRP authentication with key chains can be tricky at first, and the syntax isnīt exactly easy to remember.
But for BSCI and CCNP exam success, weīve got to be able to perform this task.
In a previous tutorial, we saw how to configure RIPv2 packet authentication, with both clear-text and MD5 authentication schemes. EIGRP authentication is much the same, and has the text and MD5 authentication options as well. But EIGRP being EIGRP, the command just has to be a little more detailed!
As with RIPv2, the authentication mode must be agreed upon by the EIGRP neighbors. If one routerīs interface is configured for MD5 authentication and the remote routerīs interface is configured for text authentication, the adjacency will fail even if the two interfaces in question are configured to use the same password.
Weīll now configure link authentication on the adjacency over an Ethernet segment. Below, youīll see how to configure a key chain called EIGRP on both routers, use key number 1, and use the key-string BSCI. Run show key chain on a router to see all key chains.
R2(config)#key chain EIGRP
R2(config-keychain)#key 1
R2(config-keychain-key)#key-string BSCI
R2#show key chain
Key-chain EIGRP:
key 1 -- text "BSCI"
accept lifetime (always valid) - (always valid) [valid now]
send lifetime (always valid) - (always valid) [valid now]
R3(config)#key chain EIGRP
R3(config-keychain)#key 1
R3(config-keychain-key)#key-string BSCI
R3#show key chain
Key-chain EIGRP:
key 1 -- text "BSCI"
accept lifetime (always valid) - (always valid) [valid now]
send lifetime (always valid) - (always valid) [valid now]
Click
here to read the full article.
About the Author:
Chris Bryant, CCIE #12933, is the owner of The
Bryant Advantage. |
