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Cisco IOS CLI also offers a show command that provides a quick reference for interface information, access lists, debugging status, and many other statistics This information helps you confirm specific configurations without having to go through the whole configuration file Routers and switches have similar show commands Following are some of the more useful show commands that can be executed on a router or on a switch: Switch or Router#show access-lists List access lists accounting Accounting data for active sessions aliases Display alias commands arp ARP table cdp CDP information clock Display the system clock configuration Contents of Non-Volatile memory controllers Interface controller status debugging State of each debugging option history Display the session command history hosts IP domain-name, lookup style, nameservers, and host table interfaces Interface status and configuration ip IP information line TTY line information location Display the system location logging Show the contents of logging buffers memory Memory statistics privilege Show current privilege level processes Active process statistics queue Show queue contents queueing Show queueing configuration registry Function registry information reload Scheduled reload information rhosts Remote-host+user equivalences rmon rmon statistics running-config Current operating configuration sessions Information about Telnet connections snmp snmp statistics spanning-tree Spanning tree topology stacks Process stack utilization startup-config Contents of startup configuration subsys Show subsystem information tcp Status of TCP connections tech-support Show system information for Tech-Support terminal Display terminal configuration parameters users Display information about terminal lines version System hardware and software status vlan VTP VLAN status
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The debugging commands are very useful when you're troubleshooting network communication problems Debugging lets you actually see the traffic that is being sent through the network device NoteAlthough debugging commands are very useful, it's very important to be careful of what type of debugging is turned on By debugging common, universal traffic, you may overload the network device's processor and cause it to lock up One debugging command that should be especially avoided is debug all, which turns on all debugging options SENDING DEBUGGING COMMANDS TO THE SCREEN To view logging results, you can have them displayed to the terminal screen If you're attached directly to the console port, the messages will appear immediately on the screen following the debug command If you attached through a Telnet session, you'll need to enable the network device to copy the messages to your Telnet session This is achieved by using the following command in the configuration mode of the network device: velte(config)#logging monitor debugging USEFUL DEBUGGING COMMANDS Here's a list of the common debugging commands used by both Cisco routers and switches: Switch or Router#debug aaa AAA Authentication, Authorization and Accounting all Enable all debugging arp IP ARP and HP Probe transactions cdp CDP information custom-queue Custom output queueing domain Domain Name System ethernet-interface Ethernet network interface events ip IP information list Set interface or/and access list for the next debug command modem Modem control/process activation packet Log unknown packets priority Priority output queueing snmp SNMP information telnet Incoming telnet connections tftp TFTP packets Typically, the debugging tool is used when you're trying to determine whether or not traffic is traversing the router You turn on debugging for specific protocol(s) you want to watch for Then start the traffic If the traffic you have generated is hitting the router (assuming it uses the same protocols you are debugging), you can actually see the packets on the router through your console or Telnet session The router will display information such as traffic source and destination Common protocols you can capture are IP, SNMP, Telnet, and TFTP Several of the debugging commands have additional parameters that can make the command more specific For example, you don't have to turn on debugging for all of IP or all of TCP in order to verify that traffic is able to reach a network device With the ICMP debugging parameter, you can turn on ICMP debugging for the remote network device, and then ping from your workstation to the device If the network device generates log statements, verifying your ICMP traffic, then you know the routes from your workstation to that device are correct Here is the command to enable ICMP debugging on either a router or a switch: Router or Switch#debug IP ICMP ICMP packet debugging is on SENDING DEBUGGING COMMANDS TO AN INTERNAL BUFFER
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The most efficient way to have the router report debug information is to use the logging buffered command in the config mode The debugging information within the log file can then be viewed using the show log command (you must first exit config mode before doing the show command) These commands are illustrated as follows: Switch(config)#logging buffered Switch(config)#exit Switch#show log Syslog logging: enabled (0 messages dropped, 35 flushes, 0 overruns) Console logging: disabled Monitor logging: level debugging, 0 messages logged Trap logging: level informational, 5571 message lines logged File logging: disabled Buffer logging: level debugging, 5567 messages logged Log Buffer (4096 bytes): NoteAs of IOS version 112, you can issue a clear log command to clear the log buffer It can be helpful to get rid of old unneeded messages while you are debugging a problem
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