qr code c# free 11: Cisco IOS Software in Objective-C

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11: Cisco IOS Software
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For more detailed help, you can follow a command or parameter with a space and a This causes the CLI to list the available options or parameters that are included for the command For instance, you could type erase followed by a space and a to see all of the parameters available for the erase command:
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Router# erase /all flash: nvram: pram: slot0: slot1: startup-config Router# erase Erase all files(in NVRAM) Filesystem to be erased Filesystem to be erased Filesystem to be erased Filesystem to be erased Filesystem to be erased Erase contents of configuration memory
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In this example, you can see at least the first parameter necessary after the erase command Please note that additional parameters may appear after the first one, depending on the next parameter that you enter If you re not sure how to spell a command, you can enter the first few characters and immediately follow these characters with a Typing e , for instance, lists all the commands that begin with e at the current mode:
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Router# e enable erase Router# e exit
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This example shows that three commands begin with the letter e in Privilege EXEC mode
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1102 The CD includes a multimedia demonstration of using context-sensitive help on a Cisco router
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Errors inevitably creep up when you enter commands Whenever you mistype a command, the IOS tells you that it has encountered a problem with the previously executed command For instance, this message indicates a CLI input error:
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% Invalid input detected at '^'
You should examine the line between the command that you typed in and the error message Somewhere in this line, you ll see a ^ character This is used by the IOS to indicate that an error exists in the command line at that spot
IOS Basics
Here is another CLI error message:
% Incomplete command
This error indicates that you have not entered all the necessary parameters for the command The syntax of the command is correct, but more parameters are necessary In this case, you can use the context-sensitive help feature to help you figure out what parameter or parameters you forgot You see an error message similar to the following if you do not type in enough characters to make a command or parameter unique:
% Ambiguous command: "show i"
In this example, apparently, more than one parameter for the show command begins with the letter i Again, you can use context-sensitive help to figure out what parameter to use:
Router# show i idb interfaces Router# show i ip ipv6
If you enter a command that the IOS does not understand, you ll see this error message:
% Unknown command or computer name, or unable to find computer address
If you see this, use the context-sensitive help to figure out the correct command to enter
Don t be afraid to take advantage of the context-sensitive help feature during the simulation questions on the examThis feature can be used for help
with entering commands, and it is available in the router and switch simulation questions of the exam; use it
Entering Commands
Four key features included in the IOS relate to entering commands:
Symbolic translation Command prompting Syntax checking Command recall
11: Cisco IOS Software
Whenever you enter a command in the CLI, the command-line parser dissects the command, making sure that it is a valid command with valid parameters In the case of Cisco routers only, if the CLI parser cannot find the actual command, the IOS assumes that you are trying to telnet to a machine by that name and attempts a DNS resolution of the name to an IP address This process, called symbolic translation, can be annoying at times But it does make telnetting to a remote machine easier, since you only have to type the name or IP address of the machine instead of using the telnet command, as discussed in 17 Use the no ip domain-lookup Configuration mode command to disable DNS lookups on your IOS deviceThis is typically one of the first commands I configure on a router; by doing this, any time you type an invalid command, the IOS won t do a DNS lookup, but will return an invalid command message The downside of this command is that the IOS device will no longer do DNS lookups of any kind, but this is typically not an issue in most situations You have already been presented with the command prompting feature this is most commonly seen when using the context-sensitive help, such as the following:
Router# show aaa aal2 access-expression access-lists accounting Router# show Show AAA values Show commands for AAL2 List access expression List access lists Accounting data for active sessions
In this example, after you use the context-sensitive help with the show command, the command show is left on the command line after the displayed output The IOS is assuming that you are entering one of the parameters of this command and thus reenters the command on the CLI This can be annoying if you forget that the router is performing this function and re-enter the command again, like this:
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