Command Structure 2-3
Help is most useful during configuration: query the list of possible parameters by
typing ? and, when you find the value you need, type it without losing your place
in the argument. Just be sure to leave a space between the keyword and the
question mark.
Conventions Most commands are not case sensitive. As a rule, only <name> and [password]
values require typing the correct case.
Configuration changes occur immediately but are lost on reboot unless you
save them. The save all command places configuration changes in FLASH
ROM (permanent memory). The changes are lost if not saved to FLASH ROM or
if power is lost before you can save them.
Commands to delete a network user, interface, route, TCP connection,
community name, network service and others cannot take place unless the
process or function has first been disabled.
Wherever an IP address value is required, you can enter a host name provided
you have configured a DNS server or put the name and address into the DNS
Local Host table.
Elements like vc’s and users must be disabled before changes to these
elements can be implemented.
Command Language
Terminology
The CLI command language creates, manages, displays and removes system
entities. These entities describe system and network connections and processes.
Most of the managed entities in the system are slotted in tables. Some common
examples are:
Network - defines local and remote networks, network connections, hosts
and routers
VC - A table of parameters that describes connection parameters associated
with a remote site. These parameters are used when establishing a network
connection over the WAN.
User - A table of parameters that describes connection parameters associated
with Telnet users that wish to attach and remotely manage the unit.
Filter - can be applied to interfaces, connections, and users to control access
through the system
Interface - describes physical devices; for example, ports
Syslog Host - receives system messages
DNS Server - translates IP addresses to and from host names
Route - describes a path through the network to another system or network
Table entries are created with an add command, and removed with a delete
command. The add command specifies the most important parameters of the
entry. Additional parameters are usually specified with the set command, which is
also used to change configured parameters.
The list command displays table entries. For example, list users displays all
defined administrative login profiles. The show command displays detailed
information about a specific table entry. For example, show user root displays
detailed information for the administrative login profile root.
