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Module 9: Basic Router Troubleshooting
| Command | Command Description | Command Syntax
9.1.1 | show ip route connected | Use the show ip route EXEC command to display the current state of the routing table. | show ip route [address [mask] [longer-prefixes]] | [protocol [process-id]] | [list access-list-number | access-list-name]
| show ip route network | Use the show ip route EXEC command to display the current state of the routing table. | show ip route [address [mask] [longer-prefixes]] | [protocol [process-id]] | [list access-list-number | access-list-name]
| show ip route rip | Use the show ip route EXEC command to display the current state of the routing table. | show ip route [address [mask] [longer-prefixes]] | [protocol [process-id]] | [list access-list-number | access-list-name]
| show ip route igrp | Use the show ip route EXEC command to display the current state of the routing table. | show ip route [address [mask] [longer-prefixes]] | [protocol [process-id]] | [list access-list-number | access-list-name]
| show ip route static | Use the show ip route EXEC command to display the current state of the routing table. | show ip route [address [mask] [longer-prefixes]] | [protocol [process-id]] | [list access-list-number | access-list-name]
9.1.2 | ip default-network | To select a network as a candidate route for computing the gateway of last resort, use the ip default-network global configuration command. To remove a route, use the no form of this command. | ip default-network network-number
9.1.8 | show ip rip database | Displays the contents of the RIP private database. | show ip rip database [ip-address {mask}]
9.2.5 | ping [protocol] {host | address} | Use the ping privileged EXEC command to diagnose basic network connectivity on Apollo, AppleTalk, Connectionless Network Service (CLNS), DECnet, IP, Novell IPX, VINES, or XNS networks. The optional protocol argument can be any of the following: apollo, appletalk, clns, decnet, ip, ipx, vines, or xns. To perform an extended ping, enter the ping command with no arguments. | ping [protocol] {ip-address | hostname}
9.2.6 | debug telnet | The telnet negotiation process can be viewed using the debug telnet command. | debug telnet
9.3.1 | clear counters | Many steps occur during the processing of a packet, and tests are performed at each step. The outcome of each step is recorded in an interface counter. Network administrators can analyze these interface counters to determine the reasons for sluggish router and network performance. This command is used to set all the counters of the specified interfaces to zero. | clear counters interface-type number
9.3.7 | debug all | To enable all system diagnostics, enter the debug all command in privileged EXEC mode. The no debug all command turns off all diagnostic output. Using the no debug all command is a convenient way to ensure that you have not accidentally left any debug commands turned on. | debug all
| terminal monitor | Debug output and system messages can be redirected to the remote terminal using this command. | terminal monitor
| service timestamps debug uptime | This command configures a timestamp that will show the hour:minute:second of the output, the amount of time since the router was last powered up, and when a reload command was executed. | service timestamps message-type [uptime]
| debug ip rip | This command displays RIP transactions. | debug ip rip
| show debugging | To view what is currently being examined by a debug command use the show debugging command. | show debugging

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