Cisco IP Routing Protocols: Trouble Shooting Techniques (Charles River Media Networking/Security)

Chapter 5: Troubleshooting TCP/IP

Listing 5.1 Sample Output of ping Command in the User Exec Mode

Listing 5.2 Sample Output of the ping Command in the Privilege Exec Mode

Listing 5.3 Output of the ping Command

Listing 5.4 Sample Output of the trace Command

Listing 5.5 Sample Output of the show ip route Command

Listing 5.6 Sample Output of the show ip route Command

Listing 5.7 Sample Output of the show ip ospf Command

Listing 5.8 Sample Output of the show ip ospf interface Command

Listing 5.9 Sample Output of the show ip ospf neighbor Command

Listing 5.10 Sample Output of the show ip access-list Command

Listing 5.11 Sample Output of the show ip arp Command

Listing 5.12 Sample Output of the show ip protocols Command

Listing 5.13 Sample Output of the show ip traffic Command texas#

Listing 5.14 Sample Output of the debug ip rip Command

Chapter 6: Troubleshooting RIP Environments

Listing 6.1 Output for show ip route rip

Listing 6.2 Output for show ip protocols

Listing 6.3 Output for show ip interface

Listing 6.4 Output of the Command router rip from Router1

Listing 6.5 Output of the Command router rip from Router2

Listing 6.6 Output of the Command router rip from Router3

Listing 6.7 Output of the Command router rip from Router4

Listing 6.8 Output of the Command show ip protocols from Router1

Listing 6.9 Output of the Command show ip protocols from Router2

Listing 6.10 Output of the Command show ip protocols from Router3

Listing 6.11 Output of the Command show ip protocols from Router4

Listing 6.12 Output of the Command show ip route from Router1

Listing 6.13 Output of the Command show ip route from Router2

Listing 6.14 Output of the Command show ip route from Router3

Listing 6.15 Output of the Command show ip route from Router4

Listing 6.16 Current State of the IP Routing Table of Router4

Listing 6.17 Output of the Command show ip protocols from Router1

Listing 6.18 Configuration for Router1

Listing 6.19 Recheck of Output of the Command show ip protocols for Router1

Listing 6.20 Recheck of Output of the Command show ip route for Router4

Listing 6.21 Configuration of Router1 Using the show running-config Command

Listing 6.22 Removing an Interface Using the no passive-interface fa0/0 Command for Router4

Listing 6.23 Routing Table of Router1

Listing 6.24 Routing Updates in Router1

Listing 6.25 Configuration of Router1 Using the Command show run

Listing 6.26 Creation of Equal Cost Path Routes Using the Command maximum-path 6 for Router1

Listing 6.27 Configuration of Router1

Listing 6.28 Configuration of Router2

Listing 6.29 Configuration of Router3

Listing 6.30 Verifying RIPv2 Protocol Configuration

Listing 6.31 Verifying RIPv2 Protocol Configuration Using the Command show ip protocols for Router2

Listing 6.32 Verifying RIPv2 Protocol Configuration for Router3

Listing 6.33 Debugging Using the debug ip rip Command on Router1

Listing 6.34 Debugging Using debug ip rip Command on Router2

Listing 6.35 Debugging Using debug ip rip Command on Router3

isting 6.36 Using the show ip route Command

Listing 6.37 Configuration for Router1

Listing 6.38 Configuration for Router2

Listing 6.39 Configuration for Router3

Listing 6.40 Debug messages for Router1

Listing 6.41 Debug Messages for Router3

Listing 6.42 Routing Table for Router1

Listing 6.43 Routing Table for Router3

Listing 6.44 Pinging IP Address 10.0.1.1 for Router3

Listing 6.45 Pinging IP Address 10.0.1.1 for Router3 Successfully

Listing 6.46 Debugging Router1 Using the debug ip rip Command

Listing 6.47 Debugging Router2 using the debug ip rip Command

Listing 6.48 Reconfiguration for Router2

Listing 6.49 Output of show ip protocols Command

Listing 6.50 Routing Table of Router2

Listing 6.51 RIP Timers Verified with show ip protocol

Listing 6.52 Output of show ip interface fa0/0 Command from Router4

Listing 6.53 Command to Enable and Disable Split Horizon

Listing 6.54 Command to Configure the Hold-down Timer

Chapter 7: Troubleshooting IGRP Routing Environments

Listing 7.1 Configuration of R1

Listing 7.2 Configuration of R2

Listing 7.3 Configuration of R3

Listing 7.4 Configuration of R4

Listing 7.5 Configuration of R5

Listing 7.6 Output of the show ip protocols Command at R2

Listing 7.7 Output of the show ip route Command at R2

Listing 7.8 Output of the show ip route igrp Command at R2

Listing 7.9 Output of the debug ip igrp transactions Command at R1

Listing 7.10 Output of the debug ip igrp events Command at R2

Listing 7.11 Output of the ping ip-address Command

Listing 7.12 Output of the undebug all Command for R2

Listing 7.13 Output of the sh ip route Command at R1

Listing 7.14 Output of the show ip protocols Command at R5

Listing 7.15 Output of the show ip protocols Command at R5

Listing 7.16 Output of the show ip route Command at R1

Listing 7.17 Configuration of R5

Listing 7.18 Output of the no passive-interface Command at R5

Listing 7.19 Output of the show ip route Command at R1

Listing 7.20 Output of the debug ip igrp Command at R1

Listing 7.21 Output of the show run Command at R1

Listing 7.22 Routing Table of R1

Listing 7.23 Routing Table of R3

Listing 7.24 Routing Table of R5

Listing 7.25 Configuration of R5

Listing 7.26 Configuration of R3

Listing 7.27 Reconfiguring R5

Listing 7.28 Routing Table for R3

Listing 7.29 Routing Table for R5

Listing 7.30 Output of the show ip protocols Command

Listing 7.31 Routing Table of R3

Listing 7.32 Configuration of R4

Listing 7.33 Output of the show ip route Command

Listing 7.34 Reconfiguration of R4

Listing 7.35 Output of the show ip route Command

Chapter 8: Troubleshooting EIGRP Routing Environments

Listing 8.1 Output for show ip eigrp interfaces Command in B2

Listing 8.2 Output of show ip eigrp neighbors Command in B2

Listing 8.3 Output of show ip eigrp topology Command in B2

Listing 8.4 Output of show ip eigrp traffic Command in B2

Listing 8.5 Output of debug eigrp neighbors Command at B2

Listing 8.6 Output of debug eigrp packets hello Command at B2

Listing 8.7 Output of the debug eigrp transmit Command at B2

Listing 8.8 Output of debug eigrp fsm Command at B2

Listing 8.9 Ping Command at B2

Listing 8.10 Ping Command at B3

Listing 8.11 Output of show ip eigrp neighbors Command at B2

Listing 8.12 Output of show ip eigrp neighbors Command at B3

Listing 8.13 Output for show ip route 192.168.1.0 Command at B2

Listing 8.14 Output for show ip protocols Command at B1

Listing 8.15 Correct Configuration of B1

Listing 8.16 Output of ping 192.168.2.5 Command at B1

Listing 8.17 Output of ping 192.168.2.5 Command at B3

Listing 8.18 Output of show ip eigrp neighbors Command at B1

Listing 8.19 Output of show ip eigrp neighbors Command at B3

Listing 8.20 Output for show ip protocols Command at B2

Listing 8.21 Correct Configuration of B2

Listing 8.22 Output of the show ip eigrp neighbors Command at A1

Listing 8.23 Output of the show interface Serial0 at A1

Listing 8.24 Output for show running-config Command at A1

Listing 8.25 Output for show ip protocols Command at A1

Listing 8.26 Output of the show ip interface Serial 0 Command at A1

Listing 8.27 Output of show ip protocols Command at A1

Listing 8.28 Output for the show ip route 192.168.4.0 Command at A1

Listing 8.29 Output of the show interface Serial 0 Command for A1

Listing 8.30 Output for the show interface Serial 0 Command for A1

Listing 8.31 Output of the show ip eigrp topology active Command in A1

Listing 8.32 Commands to Configure Redistribution from RIP into EIGRP

Chapter 9: Troubleshooting OSPF Routing Environments

Listing 9.1 Output of the show ip ospf neighbor Command at B1

Listing 9.2 Output of the show ip ospf border-routers Command at B1

Listing 9.3 Output of the show ip ospf database Command at B1

Listing 9.4 Output of the show ip ospf interface Command at B1

Listing 9.5 Output of the show ip ospf 1 Command at B1

Listing 9.6 Output of the show ip protocols Command

Listing 9.7 Output of the debug ip ospf hello Command at B1

Listing 9.8 Output of the debug ip ospf adj Command at B1

Listing 9.9 Output of the debug ip ospf events Command at B1

Listing 9.10 Output of the debug ip ospf packet Command at B1

Listing 9.11 Output of the show ip ospf neighbor Command at B1

Listing 9.12 Output of the show ip ospf interface Command at B1

Listing 9.13 Output of show ip ospf neighbor Command in INIT State

Listing 9.14 Output of show ip ospf neighbor Command in EXCHANGE State

Listing 9.15 Output of show ip ospf neighbor Command in 2-way State

Listing 9.16 Output of show ip interface FastEthernet0/1 Command at A2

Listing 9.17 Configuration of A2

Listing 9.18 Configuration of A1

Listing 9.19 Configuration of A2

Listing 9.20 Configuration of A1

Listing 9.21 Checking for Route Maps in A1

Listing 9.22 Output of the show ip protocols Command at A3

Listing 9.23 Output of show interface Serial 0/1 Command

Listing 9.24 Output of the show ip ospf interface Serial0/1 Command at B1

Listing 9.25 Output of the show ip ospf interface Serial0/1 Command at B2

Chapter 10: Troubleshooting IS-IS Routing Environments

Listing 10.1 Configuration of R1

Listing 10.2 Configuration of R2

Listing 10.3 Configuration of R3

Listing 10.4 Configuration of R4

Listing 10.5 Output for show isis Command in R2

Listing 10.6 Output of router#show clns Command in R2

Listing 10.7 Output of router#show clns neighbor Command in R2

Listing 10.8 Output of router#show clns interface interface-name Command in R2

Listing 10.9 Output of router#show clns protocol Command in R2

Listing 10.10 Output of router#show clns traffic Command in R2

Listing 10.11 Output of router#show isis database Command in R2

Listing 10.12 Output of router#show isis spf-log Command in R2

Listing 10.13 Output of debug isis adj-packets Command in R2

Listing 10.14 Output of debug isis spf-events Command in R2

Listing 10.15 Output of debug isis snp-packets Command in R2

Listing 10.16 Output of debug isis spf-update Command in R2

Listing 10.17 Configuration of R1

Listing 10.18 Configuration of R2

Listing 10.19 Output of show isis Command at R1

Listing 10.20 Output of show isis Command at R2

Listing 10.21 Correct Configuration for R1

Listing 10.22 Correct Configuration of R2

Listing 10.23 Verification of System ID on R1

Listing 10.24 Verification of System ID on R2

Listing 10.25 Reconfiguration of R2

Listing 10.26 Output for show isis Command at R1

Listing 10.27 Output for show isis Command at R2

Listing 10.28 Output of show clns neighbor Command at R4

Listing 10.29 Output of show clns neighbor Command at R4

Listing 10.30 Correct Router Configuration at R2

Listing 10.31 Redistribution Configuration in R1

Listing 10.32 Redistribution Configuration in R2

Listing 10.33 Redistribution Configuration in R3

Listing 10.34 R1 Configuration

Listing 10.35 R2 Configuration

Listing 10.36 New Configuration of R1

Listing 10.37 New Configuration of R2

Listing 10.38 New Configuration of R3

Chapter 11: Troubleshooting BGP for Routing Environments

Listing 11.1 Output of show ip bgp Command

Listing 11.2 Output of show ip bgp cidr-only Command

Listing 11.3 Output of show ip bgp community Command

Listing 11.4 Output of show ip bgp neighbors Command

Listing 11.5 Output of show ip bgp paths Command

Listing 11.6 Output of show ip bgp summ Command

Listing 11.7 Output of show ip bgp neighbor A.B.C.D advertised-routes Command

Listing 11.8 Output of show ip bgp neighbor A.B.C.D routes Command

Listing 11.9 Output of debug ip bgp 192.168.119.122 updates Command

Listing 11.10 Output of debug ip bgp events Command

Listing 11.11 Output of debug ip bgp keepalives Command

Listing 11.12 Triggered Events by BGP Neighbor Flap at B1

Listing 11.13 Checking Neighbor Reachability

Listing 11.14 Output of show ip int serial 0/0 Command

Listing 11.15 Output of show access-list 101 Command

Listing 11.16 Output of show ip route Command

Listing 11.17 Output of show ip bgp Command

Listing 11.18 Configuration of A1

Listing 11.19 Output of show running-config Command at A1

Listing 11.20 Output of show running-config Command at B1

Listing 11.21 Output of show ip route 192.168.1.0 Command

Listing 11.22 Configuration at C1

Listing 11.23 Relevant Configuration at C1

Listing 11.24 Configuration at A1

Listing 11.25 Configuration at B1

Listing 11.26 Output of show ip bgp 10.10.1.0/24 Command

Listing 11.27 Output of show ip bgp 10.10.1.0/24 Command

Listing 11.28 Output of show ip route Command at A1

Listing 11.29 Configuration of A1

Listing 11.30 Configuration of B1

Listing 11.31 Output of show ip route 192.168.1.0 Command

Listing 11.32 Output of show ip bgp neighbor Command

Listing 11.33 Output of show ip bgp neighbor 10.4.1.2 Command

Listing 11.34 Output of show running-configuration Command at C1

Listing 11.35 Output of show running-configuration Command

Listing 11.36 Output of show running-config Command

Chapter 12: Troubleshooting Redistribution Routing Environments

Listing 12.1 Output of the show ip interface brief Command

Listing 12.2 Output of the show ip protocols Command

Listing 12.3 Output of the show ip route Command

Listing 12.4 Part of Configuration to Check Redistribution

Listing 12.5 Corrected Configuration for Redistribution of 192.168.30.0/27

Listing 12.6 Output of the show ip route Command for B7

Listing 12.7 Output of the show ip interface brief Command

Listing 12.8 Output of the show ip protocols Command

Listing 12.9 Output of the show ip route Command

Listing 12.10 Redistribution Configuration

Listing 12.11 Available Route After Access List Modification

Listing 12.12 Output of the show ip route 192.168.1.66 Command

Listing 12.13 Configuration to Allow Subnets in Redistribution

Listing 12.14 Output of the show ip route 172.16.1.1 Command

Listing 12.15 Part of the Configuration to Check Route Maps

Listing 12.16 Output of Ping Command

Listing 12.17 Output of the show running-config Command

Listing 12.18 Modifying Access List 20

Listing 12.19 Configuration for Optimal RIP Route Selection

Listing 12.20 Part of the Backup Path Configuration

Listing 12.21 Output of the show ip route 172.16.10.1 Command