Switch Ioss; The Ios Configuration Modes - Cisco RJ-45-to-AUX Brochure

Table 2.8: DB−25−to−DB−9 connector pinouts.
DB−25
2
3
4
5
6
7
8
20

Switch IOSs

Three types of Cisco operating systems are in use:
Set/Clear command interface—Found on models of the Catalyst 2926, 2926G, 2948G, 2980G, 4000,
5000, 5500, 6000, and 6500 series of switches. They are called Set/Clear because most commands on
the switches start with set, clear, or show.
Cisco IOS−based Command Line Interface—Most closely resembles a Cisco router's IOS Command
Line Interface. This interface is found on Catalyst 1900EN, 2820, 2900 XL, 8500, and 12000 series
models.
Menu−driven—Found exclusively on the Catalyst 1900SE, 2820SE, 3000, 3100, and 3200 series
switches.
You have to do very little in order to get a Cisco switch to work. By default, the Set/Clear command set
switches and the Cisco CLI IOS interface switches have the following default attributes:
The prompt name is set to Console>.
No hostname is configured.
No passwords are set.
All ports default to VLAN1.
The console port has no IP information.
No contact name or location information is defined.
RMON is disabled.
SNMP traps are disabled.
SNMP community strings are set Public for read−only, Private for read−write, and Secret for
read−write−all access.
VLAN Trunking Protocol (VTP) mode is set to Server.
No VTP domain or password is configured.
All VLANs are eligible for trunking.
Inter−Switch Link (ISL) defaults to Auto.

The IOS Configuration Modes

The CLI of IOS−based switches is similar to that of IOS−based routers. Commands can be recalled by using
the up or down arrows or by using a combination of Ctrl or Esc sequences to perform certain editing functions
in the command−line history buffers.
On an IOS−based switch, you can access many command modes to enter commands. Here are some of the
more important modes:
EXEC mode—When you log in to a switch, you are automatically in User EXEC command mode.
The EXEC commands are a subset of those available at the Privileged level. In general, EXEC
commands allow you to test connectivity, perform basic tests, and list system information.
Signal
TXD
RXD
RTS
CTS
DSR
GND
DCD
DTR
38
DB−9
3
2
7
8
6
5
1
4