D-Link DES-1228 - Web Smart Switch User manual

CLI Reference Manual
Product Model : DES-1228/ME
Managed10/100MbpsMetroEthernet Switch
Release1

_________________________________________________________________________________
Information in this document is subject to change without notice.
© 2009 D-Link Corporation. All rights reserved.
Reproduction in any manner whatsoever without the written permission of D-Link Corporation is strictly forbidden.
Trademarks used in this text: D-Link and the D-LINK logo are trademarks of D-Link Corporation; Microsoft and Windows are
registered trademarks of Microsoft Corporation.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or
their products. D-Link Corporation disclaims any proprietary interest in trademarks and trade names other than its own.
August 2009 P/N 651ES1228015G

Table of Contents
INTRODUCTION ..........................................................................................................................................................1
USING THE CONSOLE CLI.........................................................................................................................................3
COMMAND SYNTAX...................................................................................................................................................7
BASIC SWITCH COMMANDS.....................................................................................................................................9
MODIFY BANNER AND PROMPT COMMANDS .....................................................................................................21
SWITCH PORT COMMANDS....................................................................................................................................24
PORT SECURITY COMMANDS................................................................................................................................28
NETWORK MANAGEMENT (SNMP) COMMANDS .................................................................................................32
SWITCH UTILITY COMMANDS ................................................................................................................................54
NETWORK MONITORING COMMANDS..................................................................................................................64
MULTIPLE SPANNING TREE PROTOCOL (MSTP) COMMANDS .........................................................................76
FORWARDING DATABASE COMMANDS...............................................................................................................88
BROADCAST STORM CONTROL COMMANDS.....................................................................................................98
COS COMMANDS ...................................................................................................................................................101
PORT MIRRORING COMMANDS...........................................................................................................................116
VLAN COMMANDS .................................................................................................................................................119
LINK AGGREGATION COMMANDS.......................................................................................................................126
BASIC IP COMMANDS............................................................................................................................................131
IGMP SNOOPING COMMANDS..............................................................................................................................134
DHCP RELAY...........................................................................................................................................................144
802.1X COMMANDS................................................................................................................................................151
ACCESS CONTROL LIST (ACL) COMMANDS......................................................................................................170

SAFEGUARD ENGINE COMMANDS .....................................................................................................................182
TRAFFIC SEGMENTATION COMMANDS..............................................................................................................184
TIME AND SNTP COMMANDS...............................................................................................................................186
ARP COMMANDS....................................................................................................................................................192
ROUTING TABLE COMMANDS..............................................................................................................................196
MAC NOTIFICATION COMMANDS ........................................................................................................................198
ACCESS AUTHENTICATION CONTROL COMMANDS........................................................................................202
SSH COMMANDS....................................................................................................................................................222
SMTP COMMANDS .................................................................................................................................................229
CABLE DIAGNOSTICS COMMANDS.....................................................................................................................233
DHCP LOCAL RELAY COMMANDS ......................................................................................................................234
GRATUITOUS ARP COMMANDS...........................................................................................................................236
VLAN TRUNKING COMMANDS .............................................................................................................................240
ASYMMETRIC VLAN COMMANDS ........................................................................................................................244
IGMP SNOOPING MULTICAST VLAN COMMANDS.............................................................................................246
LLDP COMMANDS..................................................................................................................................................251
PPPOE COMMANDS...............................................................................................................................................270
IP-MAC-PORT BINDING COMMANDS...................................................................................................................273
LAYER 3 CONTROL PACKET FILTERING............................................................................................................278
LOOPBACK DETECTION COMMANDS.................................................................................................................280
TECHNICAL SUPPORT COMMANDS....................................................................................................................284
COMMAND HISTORY LIST.....................................................................................................................................287
DHCP SERVER SCREEN LIST...............................................................................................................................292

ARP SPOOFING ATTACK PREVENTION LIST.....................................................................................................295
TECHNICAL SPECIFICATIONS..............................................................................................................................297

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1
INTRODUCTION
The Switch can be managed through the Switch’s serial port, Telnet, or the Web-based management agent. The Command Line
Interface (CLI) can be used to configure and manage the Switch via the serial port or Telnet interfaces.
This manual provides a reference for all of the commands contained in the CLI. Configuration and management of the Switch via
the Web-based management agent is discussed in the Manual. This manual provides a reference for all of the commands contained
in the CLI for members of this series, including the DES-1228/ME. Examples present in this manual may refer to any member of
this series and may show different port counts, but are universal to this series of switches, unless otherwise stated. Configuration
and management of the Switch via the Web-based management agent is discussed in the User’s Guide.
Accessing the Switch via the Serial Port
The Switch’s serial port’s default settings are as follows:
•9600 baud
•no parity
•8 data bits
•1 stop bit
A computer running a terminal emulation program capable of emulating a VT-100 terminal and a serial port configured as above
are then connected to the Switch’s serial port via an RS-232 DB-9 cable.
With the serial port properly connected to a management computer, the following screen should be visible. If this screen does not
appear, try pressing Ctrl+r to refresh the console screen.
DES-1228/ME Metro Ethernet Switch Command Line Interface
Firmware: Build 1.00.B04
Copyright(C) 2009 D-Link Corporation. All rights reserved.
username:
Figure 1-1. Initial CLI screen
There is no initial username or password. Just press the Enter key twice to display the CLI input cursor −DES-1228/ME:4#.This
is the command line where all commands are input.

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Setting the Switch’s IP Address
Each Switch must be assigned its own IP Address, which is used for communication with an SNMP network manager or other
TCP/IP application (for example BOOTP, TFTP). The Switch’s default IP address is 10.90.90.90. Users can change the default
Switch IP address to meet the specification of your networking address scheme.
The Switch is also assigned a unique MAC address by the factory. This MAC address cannot be changed, and can be found on the
initial boot console screen – shown below.
Boot Procedure V1.00.01
--------------------------------------------------------------------------
Power On Self Test.................................100%
MAC Address : 00-21-91-98-60-77
H/W Version : A1
Please wait, loading V1.00.B04 Runtime image........100%
Figure 1-2. Boot screen
The Switch’s MAC address can also be found in the Web management program on the Switch Information (Basic Settings)
window on the Configuration menu.
The IP address for the Switch must be set before it can be managed with the Web-based manager. The Switch IP address can be
automatically set using BOOTP or DHCP protocols, in which case the actual address assigned to the Switch must be known.
The IP address may be set using the Command Line Interface (CLI) over the console serial port as follows:
1. Starting at the command line prompt, enter the commands config ipif System ipaddress
xxx.xxx.xxx.xxx/yyy.yyy.yyy.yyy. Where the x’s represent the IP address to be assigned to the IP interface named
System and the y’s represent the corresponding subnet mask.
2. Alternatively, users can enter config ipif System ipaddress xxx.xxx.xxx.xxx/z. Where the x’s represent the IP address to
be assigned to the IP interface named System and the zrepresents the corresponding number of subnets in CIDR
notation.
The IP interface named System on the Switch can be assigned an IP address and subnet mask which can then be used to connect a
management station to the Switch’s Telnet or Web-based management agent.
DES-1228/ME:4#config ipif System ipaddress 10.73.21.11/255.0.0.0
Command: config ipif System ipaddress 10.73.21.11/8
Success.
DES-1228/ME:4#
Figure 1-3. Assigning an IP Address
In the above example, the Switch was assigned an IP address of 10.90.90.91 with a subnet mask of 255.0.0.0. The system message
Success indicates that the command was executed successfully. The Switch can now be configured and managed via Telnet,
SNMP MIB browser and the CLI or via the Web-based management agent using the above IP address to connect to the Switch.

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2
USING THE CONSOLE CLI
The DES-1228/ME support a console management interface that allows the user to connect to the Switch’s management agent via
a serial port and a terminal or a computer running a terminal emulation program. The console can also be used over the network
using the TCP/IP Telnet protocol. The console program can be used to configure the Switch to use an SNMP-based network
management software over the network.
This chapter describes how to use the console interface to access the Switch, change its settings, and monitor its operation.
Note: Switch configuration settings are saved to non-volatile RAM using the save command. The current
configuration will then be retained in the Switch’s NV-RAM, and reloaded when the Switch is rebooted. If the
Switch is rebooted without using the save command, the last configuration saved to NV-RAM will be loaded.
Connecting to the Switch
The console interface is used by connecting the Switch to a VT100-compatible terminal or a computer running an ordinary
terminal emulator program (e.g., the HyperTerminal program included with the Windows operating system) using an RS-232C
serial cable. Your terminal parameters will need to be set to:
•VT-100 compatible
•9600 baud
•8 data bits
•No parity
•One stop bit
•No flow control
Users can also access the same functions over a Telnet interface. Once users have set an IP address for your Switch, users can use
a Telnet program (in VT-100 compatible terminal mode) to access and control the Switch. All of the screens are identical, whether
accessed from the console port or from a Telnet interface.
After the Switch reboots and users have logged in, the console looks like this:
DES-1228/ME Metro Ethernet Switch Command Line Interface
Firmware: Build 1.00.B04
Copyright(C) 2009 D-Link Corporation. All rights reserved.
username:
Figure 2-1. Initial Console Screen after logging in
Commands are entered at the command prompt, DES-1228/ME:4#.
There are a number of helpful features included in the CLI. Entering the ?command will display a list of all of the top-level
commands.

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.
?
cable_diag ports
clear
clear arptable
clear counters
clear fdb
clear flood_fdb
clear igmp_snooping data_driven_group
clear log
clear port_security_entry port
config 802.1p default_priority
config 802.1p user_priority
config 802.1x auth_mode
config 802.1x auth_parameter ports
config 802.1x auth_protocol
config 802.1x capability ports
config 802.1x guest_vlan ports
config 802.1x init
config 802.1x reauth
config access_profile profile_id
config account
CTRL+C ESC q Quit SPACE n Next Page ENTER Next Entry a All
Figure 2-2. The ? Command
When users enter a command without its required parameters, the CLI will prompt users with Next possible completions:
message.
DES-1228/ME:4#config account
Command: config account
Next possible completions:
<username>
DES-1228/ME:4#
Figure 2-3. Example Command Parameter Help
In this case, the command config account was entered with the parameter <username>. The CLI will then prompt users to enter
the <username> with the message, Next possible completions:. Every command in the CLI has this feature, and complex
commands have several layers of parameter prompting.
In addition, after typing any given command plus one space, users can see all of the next possible sub-commands, in sequential
order, by repeatedly pressing the Tab key.
To re-enter the previous command at the command prompt, press the up arrow cursor key. The previous command will appear at
the command prompt.

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DES-1228/ME:4#config account
Command: config account
Next possible completions:
<username>
DES-1228/ME:4#config account
Command: config account
Next possible completions:
<username>
DES-1228/ME:4#
Figure 2-4. Using the Up Arrow to Re-enter a Command
In the above example, the command config account was entered without the required parameter <username>, the CLI returned
the Next possible completions: <username> prompt. The up arrow cursor control key was pressed to re-enter the previous
command (config account) at the command prompt. Now the appropriate username can be entered and the config account
command re-executed.
All commands in the CLI function in this way. In addition, the syntax of the help prompts are the same as presented in this manual
−angle brackets < > indicate a numerical value or character string, braces { } indicate optional parameters or a choice of
parameters, and brackets [ ] indicate required parameters.
If a command is entered that is unrecognized by the CLI, the top-level commands will be displayed under the Available
commands: prompt.
DES-1228/ME:4#the
Available commands:
.. ? cable_diag clear
config create delete dir
disable download enable login
logout ping reboot reset
save show smtp telnet
traceroute upload
DES-1228/ME:4#
Figure 2-5. The Next Available Commands Prompt
The top-level commands consist of commands such as show or config. Most of these commands require one or more parameters
to narrow the top-level command. This is equivalent to show what? or config what? Where the what? is the next parameter.
For example, if users enter the show command with no additional parameters, the CLI will then display all of the possible next
parameters.

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DES-1228/ME:4#show
Command: show
Next possible completions:
802.1p 802.1x access_profile account
acct_client address_binding arp_spoofing_prevention
arpentry asymmetric_vlan auth_client auth_diagnostics
auth_session_statistics auth_statistics authen
authen_enable authen_login authen_policy auto_fdb
autoconfig bandwidth_control command command_history
config cos cpu_access_profile
cpu_filter dhcp_local_relay dhcp_relay dscp_mapping
error fdb filter firmware
flood_fdb gratuitous_arp greeting_message gvrp
igmp_snooping ipif iproute lacp_port
link_aggregation lldp log log_save_timing
loopdetect mac_notification mgmt_pkt_priority mirror
multicast multicast_fdb packet port_security
ports pppoe radius router_ports
safeguard_engine scheduling scheduling_mechanism
serial_port session smtp snmp
sntp ssh stp switch
syslog tech_support terminal_line time
traffic traffic_segmentation trusted_host
utilization vlan vlan_trunk
DES-1228/ME:4#
Figure 2-6. Next possible completions: Show Command
In the above example, all of the possible next parameters for the show command are displayed. At the next command prompt, the
up arrow was used to re-enter the show command, followed by the account parameter. The CLI then displays the user accounts
configured on the Switch.

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3
COMMAND SYNTAX
The following symbols are used to describe how command entries are made and values and arguments are specified in this
manual.
Note: All commands are case-sensitive. Be sure to disable Caps Lock or any other unwanted
function that changes text case.
<angle brackets>
Purpose Encloses a variable or value that must be specified.
Syntax config ipif <ipif_name 12> [{ipaddress <network_address> | vlan <vlan_name 32> |
state [enable | disable}] | bootp | dhcp]
Description In the above syntax example, users must supply an IP interface name in the <ipif_name
12> space, a VLAN name in the <vlan_name 32> space, and the network address in the
<network_address> space. Do not type the angle brackets.
Example Command config ipif System ipaddress 10.24.22.5/255.0.0.0 vlan default state enable
[square brackets]
Purpose Encloses a required value or set of required arguments. One value or argument can be
specified.
Syntax create account [admin | user] <username 15>
Description In the above syntax example, users must specify either an admin or a user level account
to be created. Do not type the square brackets.
Example Command create account admin Darren
| vertical bar
Purpose Separates two or more mutually exclusive items in a list, one of which must be entered.
Syntax create account [admin | user] <username 15>
Description In the above syntax example, users must specify either admin, or user. Do not type the
vertical bar.
Example Command create account admin Darren
{braces}
Purpose Encloses an optional value or set of optional arguments.
Syntax reset {[config | system]}
Description In the above syntax example, users have the option to specify config or system. It is not
necessary to specify either optional value, however the effect of the system reset is
dependent on which, if any, value is specified. Therefore, with this example there are three
possible outcomes of performing a system reset. See the following chapter, Basic
Commands for more details about the reset command.
Example command reset config

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(parentheses)
Purpose Indicates at least one or more of the values or argum
ents in the preceding syntax
enclosed by braces must be specified.
Syntax config dhcp_relay {hops <value 1-16> | time <sec 0-65535>}(1)
Description In the above syntax example, users have the option to specify hops or time or both of
them. The "(1)" following the set of braces indicates at least one argument or value within
the braces must be specified. Do not type the parentheses.
Example command config dhcp_relay hops 3
Line Editing Key Usage
Delete Deletes the character under the cursor and then shifts the remaining characters in the line
to the left.
Backspace Deletes the character to the left of the cursor and then shifts the remaining characters in
the line to the left.
Insert or Ctrl+R Toggle on and off. When toggled on, inserts text and shifts previous text to the right.
Left Arrow Moves the cursor to the left.
Right Arrow Moves the cursor to the right.
Up Arrow Repeats the previously entered command. Each time the up arrow is pressed, the
command previous to that displayed appears. This way it is possible to review the
command history for the current session. Use the down arrow to progress sequentially
forward through the command history list.
Down Arrow The down arrow will display the next command in the command history entered in the
current session. This displays each command sequentially as it was entered. Use the up
arrow to review previous commands.
Tab Shifts the cursor to the next field to the left.
Multiple Page Display Control Keys
Space Displays the next page.
CTRL+c Stops the display of remaining pages when multiple pages are to be displayed.
ESC Stops the display of remaining pages when multiple pages are to be displayed.
n Displays the next page.
p Displays the previous page.
q Stops the display of remaining pages when multiple pages are to be displayed.
r Refreshes the pages currently displayed.
a Displays the remaining pages without pausing between pages.
Enter Displays the next line or table entry.

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4
BASIC SWITCH COMMANDS
The basic switch commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the
following table.
Command Parameters
enable password
encryption
disable password
encryption
create account [admin | user] <username 15>
config account <username 15>
show account
delete account <username 15>
show session
show switch
show serial_port
config serial_port { baud_rate [9600|19200|38400|115200] | auto_logout
[never|2_minutes|5_minutes|10_minutes|15_minutes] }(1)
enable clipaging
disable clipaging
enable telnet <tcp_port_number 1-65535>
disable telnet
telnet <ipaddr> {tcp_port <value 0-65535>}
enable web <tcp_port_number 1-65535>
disable web
save {[config {config_id <value 1-2>} | log | all]}
reboot {force_agree}
reset {[config | system ]} { force_agree]}
login
logout
Each command is listed, in detail, in the following sections.

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enable password encryption
Purpose Used to enable password encryption on a user account.
Syntax enable password encryption
Description The user account configuration information will be stored in the configuration file, and can
be applied to the system at a time in the future. If the password encryption is enabled, the
password will be in encrypted form. If password encryption is disabled and the user
specifies the password in encrypted form, or if the password has been converted to
encrypted form by the last enabled password encryption command, the password will still
be in encrypted form. It can not revert back to plain text.
Parameters None.
Restrictions Only Administrator-level users can issue this command.
Example usage:
To enable password encryption on the Switch.
DES-1228/ME:4#enable password encryption
Command: enable password encryption
Success.
DES-1228/ME:4#
disable password encryption
Purpose Used to disable password encryption on a user account.
Syntax disable password encryption
Description The user account configuration information will be stored in the configuration file, and can
be applied to the system at a time in the future. If the password encryption is enabled, the
password will be in encrypted form. If password encryption is disabled and the user
specifies the password in encrypted form, or if the password has been converted to
encrypted form by the last enabled password encryption command, the password will still
be in encrypted form. It can not revert back to plain text.
Parameters None.
Restrictions Only Administrator-level users can issue this command.
Example usage:
To disable password encryption on the Switch.
DES-1228/ME:4#disable password encryption
Command: disable password encryption
Success.
DES-1228/ME:4#

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create account
Purpose Used to create user accounts.
Syntax create account [admin | user] <username 15>
Description The create account command is used to create user accounts that consist of a username
of 1 to 15 characters and a password of 0 to 15 characters. Up to 8 user accounts can be
created.
Parameters admin <username>
user <username>
Restrictions Only Administrator-level users can issue this command.
Usernames can be between 1 and 15 characters.
Passwords can be between 0 and 15 characters.
Example usage:
To create an administrator-level user account with the username “dlink”.
DES-1228/ME:4#create account admin dlink
Command: create account admin dlink
Enter a case-sensitive new password:****
Enter the new password again for confirmation:****
Success.
DES-1228/ME:4#
config account
Purpose Used to configure user accounts
Syntax config account <username>
Description The config account command configures a user account that has been created using the
create account command.
Parameters <username>
Restrictions Only Administrator-level users can issue this command.
Usernames can be between 1 and 15 characters.
Passwords can be between 0 and 35 characters.
Example usage:
To configure the user password of “dlink” account:
DES-1228/ME:4#config account dlink
Command: config account dlink
Enter a old password:****
Enter a case-sensitive new password:****
Enter the new password again for confirmation:****
Success.
DES-1228/ME:4#

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show account
Purpose Used to display user accounts.
Syntax show account
Description Displays all user accounts created on the Switch. Up to 8 user accounts can exist at one
time.
Parameters None.
Restrictions Only Administrator-level users can issue this command.
Example usage:
To display the accounts that have been created:
DES-1228/ME:4#show account
Command: show account
Current Accounts:
Username Access Level
---------- ------------
dlink Admin
Total Entries: 1
DES-1228/ME:4#
delete account
Purpose Used to delete an existing user account.
Syntax delete account <username>
Description The delete account command deletes a user account that has been created using the
create account command.
Parameters <username>
Restrictions Only Administrator-level users can issue this command.
Example usage:
To delete the user account “System”:
DES-1228/ME:4#delete account System
Command: delete account System
Success.
DES-1228/ME:4#
show session
Purpose Used to display a list of currently logged-in users.
Syntax show session
Description This command displays a list of all the users that are logged-in at the time the command is
issued.
Parameters None.
Restrictions None.

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Example usage:
To display the way that the users logged in:
DES-1228/ME:4#show session
Command: show session
ID Login Time Live Time From Level Name
-- -------------------- ----------- ----------- ----- -----------
8 00000 days 00:00:37 0:3:36:27 Serial Port 4 Anonymous
Total Entries: 1
CTRL+C ESC q Quit SPACE n Next Page p Previous Page r Refresh
show switch
Purpose Used to display general information about the Switch.
Syntax show switch
Description This command displays information about the Switch.
Parameters None.
Restrictions Only Administrator-level users can issue this command.
Example usage:
To display the Switch’s information:
DES-1228/ME:4#show switch
Command: show switch
Device Type : DES-1228/ME Metro Ethernet Switch
MAC Address : 00-19-5B-EF-78-B5
IP Address : 10.73.21.11 (Manual)
VLAN Name : default
Subnet Mask : 255.0.0.0
Default Gateway : 0.0.0.0
Boot PROM Version : Build 1.00.B01
Firmware Version : Build 1.00.B04
Hardware Version : A1
System Name :
System Location :
System Contact :
Spanning Tree : Disabled
GVRP : Disabled
IGMP Snooping : Disabled
VLAN trunk : Disabled
802.1x : Disabled
TELNET : Enabled(TCP 23)
WEB : Enabled(TCP 80)
RMON : Disabled
SSH : Disabled
Clipaging : Enabled
CTRL+C ESC q Quit SPACE n Next Page ENTER Next Entry a All

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show serial_port
Purpose Used to display the current serial port settings.
Syntax show serial_port
Description This command displays the current serial port settings.
Parameters None.
Restrictions None
Example usage:
To display the serial port setting:
DES-1228/ME:4#show serial_port
Command: show serial_port
Baud Rate : 9600
Data Bits : 8
Parity Bits : None
Stop Bits : 1
Auto-Logout : 10 mins
DES-1228/ME:4#
config serial_port
Purpose Used to configure the serial port.
Syntax config serial_port { baud_rate [9600|19200|38400|115200] | auto_logout
[never|2_minutes|5_minutes|10_minutes|15_minutes] }(1)
Description This command is used to configure the serial port’s baud rate and auto logout settings.
Parameters baud_rate [9600 | 19200 | 38400 | 115200] −The serial bit rate that will be used to communicate
with the management host. There are four options: 9600, 19200, 38400, 115200.
never −No time limit on the length of time the console can be open with no user input.
2_minutes −The console will log out the current user if there is no user input for 2 minutes.
5_minutes −The console will log out the current user if there is no user input for 5 minutes.
10_minutes −The console will log out the current user if there is no user input for 10 minutes.
15_minutes −The console will log out the current user if there is no user input for 15 minutes.
Restrictions Only Administrator-level users can issue this command.
Example usage:
To configure the baud rate:
DES-1228/ME:4#config serial_port baud_rate 115200
Command: config serial_port baud_rate 115200
Success.
DES-1228/ME:4#

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enable clipaging
Purpose Used to pause the scrolling of the console screen when a command displays more than
one page.
Syntax enable clipaging
Description This command is used when issuing a command which causes the console screen to
rapidly scroll through several pages. This command will cause the console to pause at the
end of each page. The default setting is enabled.
Parameters None.
Restrictions Only Administrator-level users can issue this command.
Example usage:
To enable pausing of the screen display when the show command output reaches the end of the page:
DES-1228/ME:4#enable clipaging
Command: enable clipaging
Success.
DES-1228/ME:4#
disable clipaging
Purpose Used to disable the pausing of the console screen scrolling at the end of each page when
a command displays more than one screen of information.
Syntax disable clipaging
Description This command is used to disable the pausing of the console screen at the end of each
page when a command would display more than one screen of information.
Parameters None.
Restrictions Only Administrator-level users can issue this command.
Example usage:
To disable pausing of the screen display when show command output reaches the end of the page:
DES-1228/ME:4#disable clipaging
Command: disable clipaging
Success.
DES-1228/ME:4#
enable telnet
Purpose Used to enable communication with and management of the Switch using the Telnet
protocol.
Syntax enable telnet <tcp_port_number 1-65535>
Description This command is used to enable the Telnet protocol on the Switch. The user can specify
the TCP or UDP port number the Switch will use to listen for Telnet requests.
Parameters <tcp_port_number 1-65535> −The TCP port number. TCP ports are numbered between 1
and 65535. The “well-known” TCP port for the Telnet protocol is 23.
Restrictions Only Administrator-level users can issue this command.