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Configuring EIGRP BSCI Module 2 4 Configuring EIGRP Authentication BSCI 2 4 2006 Cisco Systems Inc All rights reserved Cisco Public 1 Objectives Upon completing this lesson you will be able to implement authentication in an EIGRP network This ability includes being able to meet these objectives Describe router authentication Describe the MD5 authentication used in EIGRP Configure MD5 authentication Troubleshoot MD5 authentication BSCI 2 4 2006 Cisco Systems Inc All rights reserved Cisco Public 2 Purpose of this Lesson Coverage of topics new to the EIGRP module of BSCI What s new in this module EIGRP Message Digest 5 MD5 authentication and how to configure and troubleshoot it BSCI 2 4 2006 Cisco Systems Inc All rights reserved Cisco Public 3 Router Authentication Many routing protocols support authentication such that a router authenticates the source of each routing update packet that it receives Simple password authentication is supported by IS IS OSPF RIPv2 MD5 authentication is supported by OSPF RIPv2 BGP EIGRP BSCI 2 4 2006 Cisco Systems Inc All rights reserved Cisco Public 4 Simple Password vs MD5 Authentication Simple password authentication Router sends packet and key Neighbor checks if received key matches its key Not secure MD5 authentication Configure a key password and key id router generates a message digest or hash of the key key id and message Message digest is sent with packet key is not sent Secure BSCI 2 4 2006 Cisco Systems Inc All rights reserved Cisco Public 5 EIGRP MD5 Authentication EIGRP supports MD5 authentication Router generates and checks every EIGRP packet Router authenticates the source of each routing update packet that it receives Configure a key password and key id each participating neighbor must have same key configured BSCI 2 4 2006 Cisco Systems Inc All rights reserved Cisco Public 6 MD5 Authentication EIGRP MD5 authentication Router generates a message digest or hash of the key key id and message EIGRP allows keys to be managed



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