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To display a brief description of the help system, enter the help command.
This command has no arguments or keywords.
The help command provides a brief description of the context-sensitive help system.
Enter the help command for a brief description of the help system.
The following example shows how to use command syntax help to display the next argument of a partially complete access-list command. One option is to add a wildcard mask. The <cr> symbol indicates that the other option is to press Return to execute the command.
To enable the command history function or to change the command history buffer size for a particular line, use the history line configuration command. To disable the command history feature, use the no form of this command.
The history command without the size keyword and the number-of-lines argument enables the history function with the last buffer size specified or with the default of 10 lines if there was not a prior setting.
The no history command without the size keyword and the number-of lines argument disables the history feature but remembers the buffer size if it was something other than the default. The no history size command resets the buffer size to 10.
Note The history size command only sets the size of the buffer; it does not re-enable the history feature. If the no history command is used, the history command must be used to re-enable this feature.
The command history feature provides a record of EXEC commands you have entered. This feature is particularly useful for recalling long or complex commands or entries, including access lists.
Table 7-1 lists the keys and functions you can use to recall commands from the command history buffer.
| 1The arrow keys function only with ANSI-compatible terminals such as VT100s. |
In the following example, line 4 is configured with a history buffer size of 35 lines.
show history
terminal history size
Note This command or some of its parameters might not function as expected in the LightStream 1010 ATM switch environment.
To specify the hold-queue limit of an interface, use the hold-queue interface configuration command. Use the no form of this command with the appropriate keyword to restore the default values for an interface.
The default input hold-queue limit is 75 packets. The default output hold-queue limit is 40 packets. These limits prevent a malfunctioning interface from consuming an excessive amount of memory. There is no fixed upper limit to a queue size.
This command only applies to the ASP interface. The input hold queue prevents a single interface from flooding the network server with too many input packets. Further input packets are discarded if the interface has too many input packets outstanding in the system.
If priority output queueing is being used, the length of the four output queues is set using the priority-list global configuration command. The hold-queue command cannot be used to set an output hold queue length in this situation.
For slow interfaces, use a small output hold-queue limit. This approach prevents storing packets at a rate that exceeds the transmission capability of the interface. For fast interfaces, use a large output hold-queue limit. A fast interface may be busy for a short time (and thus require the hold queue) but can empty the output hold queue quickly when capacity returns.
To display the current hold queue setting and the number of packets discarded because of hold queue overflows, use the EXEC command show interface.
Note Increasing the hold queue can have detrimental effects on network routing and response times. For protocols that use seq/ack packets to determine round-trip times, do not increase the output queue. Instead, dropping packets informs the hosts to slow down transmissions to match available bandwidth. This is generally better than having duplicate copies of the same packet within the network (which can happen with large hold queues).
The following example illustrates how to set a small input queue on a slow async line.
To specify or modify the host name for the switch, use the hostname global configuration command. The host name is used in prompts and default configuration filenames.
The factory-assigned default host name is switch.
The order of display at startup is banner message-of-the-day (MOTD), then login and password prompts, then EXEC banner.
The following example changes the host name to ls1010.
Posted: Thu Jan 23 20:59:29 PST 2003
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