Cisco Catalyst 1900 Series, Brochure

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Table 2.8: DB−25−to−DB−9 connector pinouts.
DB−25 Signal DB−9
2 TXD 3
3 RXD 2
4 RTS 7
5 CTS 8
6 DSR 6
7 GND 5
8 DCD 1
20 DTR 4
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.
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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.
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Menu−driven—Found exclusively on the Catalyst 1900SE, 2820SE, 3000, 3100, and 3200 series
switches.
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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>.
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No hostname is configured.
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No passwords are set.
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All ports default to VLAN1.
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The console port has no IP information.
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No contact name or location information is defined.
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RMON is disabled.
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SNMP traps are disabled.
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SNMP community strings are set Public for read−only, Private for read−write, and Secret for
read−write−all access.
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VLAN Trunking Protocol (VTP) mode is set to Server.
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No VTP domain or password is configured.
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All VLANs are eligible for trunking.
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Inter−Switch Link (ISL) defaults to Auto.
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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.
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