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1、 2007 Cisco Systems, Inc. All rights reserved.ICND2 v1.05-1EIGRP Implementation Troubleshooting EIGRP 2007 Cisco Systems, Inc. All rights reserved.ICND2 v1.05-2Components of Troubleshooting EIGRP 2007 Cisco Systems, Inc. All rights reserved.ICND2 v1.05-3Troubleshooting EIGRP Neighbor Issues 2007 Cis

2、co Systems, Inc. All rights reserved.ICND2 v1.05-4Troubleshooting EIGRP Routing Tables 2007 Cisco Systems, Inc. All rights reserved.ICND2 v1.05-5Troubleshooting EIGRP AuthenticationRouterX# debug eigrp packetsEIGRP Packets debugging is on (UPDATE, REQUEST, QUERY, REPLY, HELLO, IPXSAP, PROBE, ACK, ST

3、UB, SIAQUERY, SIAREPLY)*Jan 21 16:38:51.745: EIGRP: received packet with MD5 authentication, key id = 1*Jan 21 16:38:51.745: EIGRP: Received HELLO on Serial0/0/1 nbr 192.168.1.102*Jan 21 16:38:51.745: AS 100, Flags 0 x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0RouterY# debug eigrp packet

4、sEIGRP Packets debugging is on (UPDATE, REQUEST, QUERY, REPLY, HELLO, IPXSAP, PROBE, ACK, STUB, SIAQUERY, SIAREPLY)RouterY#*Jan 21 16:38:38.321: EIGRP: received packet with MD5 authentication, key id = 2*Jan 21 16:38:38.321: EIGRP: Received HELLO on Serial0/0/1 nbr 192.168.1.101*Jan 21 16:38:38.321:

5、 AS 100, Flags 0 x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0A successful MD5 authentication between RouterX and RouterY 2007 Cisco Systems, Inc. All rights reserved.ICND2 v1.05-6Troubleshooting EIGRP Authentication ProblemRouterX(config-if)#key chain RouterXchainRouterX(config-keychain)

6、#key 2RouterX(config-keychain-key)#key-string wrongkeyRouterY#debug eigrp packetsEIGRP Packets debugging is on (UPDATE, REQUEST, QUERY, REPLY, HELLO, IPXSAP, PROBE, ACK, STUB, SIAQUERY, SIAREPLY)RouterY#*Jan 21 16:50:18.749: EIGRP: pkt key id = 2, authentication mismatch*Jan 21 16:50:18.749: EIGRP:

7、Serial0/0/1: ignored packet from 192.168.1.101, opcode = 5 (invalid authentication)*Jan 21 16:50:18.749: EIGRP: Dropping peer, invalid authentication*Jan 21 16:50:18.749: EIGRP: Sending HELLO on Serial0/0/1*Jan 21 16:50:18.749: AS 100, Flags 0 x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0*Jan 21 16:50:18.7

8、53: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.1.101 (Serial0/0/1) is down: Auth failureRouterY#show ip eigrp neighborsIP-EIGRP neighbors for process 100RouterY# Unsuccessful MD5 authentication between RouterX and RouterY when RouterX key 2 is changed 2007 Cisco Systems, Inc. All rights re

9、served.ICND2 v1.05-7Visual Objective 5-2: Troubleshooting EIGRP 2007 Cisco Systems, Inc. All rights reserved.ICND2 v1.05-8Summary There are several aspects of troubleshooting EIGRP, such as resolving neighbor relationships, routing table issues, and authentication problems. Issues that can cause EIG

10、RP neighbor problems include incorrect network commands and hello packet information mismatches. Use the command show ip eigrp neighbors to help troubleshoot these issues. Missing EIGRP routes from the routing table may be due to route filtering or automatic summarization in discontiguous networks. Use the show ip route command to help troubleshoot

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