D-Link xStack User manual

xStack® DGS-3120 Series Layer 3 Managed Gigabit Switch CLI Reference Guide
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Table of Contents
Chapter 1 Using Command Line Interface.............................................................................................1
Chapter 2 Basic Command List .............................................................................................................8
Chapter 3 802.1Q VLAN Command List..............................................................................................23
Chapter 4 802.1X Command List.........................................................................................................38
Chapter 5 Access Authentication Control Command List....................................................................62
Chapter 6 Access Control List (ACL) Command List.........................................................................103
Chapter 7 Access Control List (ACL) Egress Command List (RI and EI Mode Only) .......................123
Chapter 8 Address Resolution Protocol (ARP) Command List..........................................................142
Chapter 9 ARP Spoofing Prevention Command List.........................................................................147
Chapter 10 Asymmetric VLAN Command List.....................................................................................149
Chapter 11 Auto-Configuration Command List....................................................................................151
Chapter 12 Basic Commands Command List......................................................................................153
Chapter 13 BPDU Attack Protection Command List............................................................................170
Chapter 14 Cable Diagnostics Command List.....................................................................................175
Chapter 15 Command Logging Command List....................................................................................178
Chapter 16 Compound Authentication Command List ........................................................................181
Chapter 17 Configuration Command List.............................................................................................192
Chapter 18 Configuration Trap Command List....................................................................................197
Chapter 19 Connectivity Fault Management (CFM) Command List (RI and EI Mode Only)...............199
Chapter 20 Connectivity Fault Management (CFM) Extension Command List (RI and EI Mode Only)
...........................................................................................................................................227
Chapter 21 CPU Interface Filtering Command List .............................................................................231
Chapter 22 Debug Software Command List ........................................................................................242
Chapter 23 Denial-of-Service (DoS) Attack Prevention Command List ..............................................284
Chapter 24 DHCP Local Relay Command List....................................................................................288
Chapter 25 DHCP Relay Command List..............................................................................................292
Chapter 26 DHCP Server Command List (RI Mode Only)...................................................................311
Chapter 27 DHCP Server Screening Command List...........................................................................330
Chapter 28 DHCPv6 Relay Command List..........................................................................................334
Chapter 29 Digital Diagnostic Monitoring (DDM) Command List (RI and EI Mode Only)....................340
Chapter 30 Distance Vector Multicast Routing Protocol (DVMRP) Command List (RI Mode Only) ...347
Chapter 31 D-Link License management System (DLMS) Command List .........................................354
Chapter 32 D-Link Unidirectional Link Detection (DULD) Command List (RI and EI Mode Only) ......356
Chapter 33 Energy Efficient Ethernet (EEE) Command List ...............................................................358

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Chapter 34 Ethernet Ring Protection Switching (ERPS) Command List (RI and EI Mode Only)........360
Chapter 35 FDB Command List...........................................................................................................370
Chapter 36 Filter Command List..........................................................................................................380
Chapter 37 Flash File System (FFS) Command List...........................................................................383
Chapter 38 Gratuitous ARP Command List.........................................................................................394
Chapter 39 Internet Group Management Protocol (IGMP) Command List (RI Mode Only)................400
Chapter 40 IGMP Proxy Command List (RI Mode Only).....................................................................408
Chapter 41 IGMP Snooping Command List.........................................................................................413
Chapter 42 IP-MAC-Port Binding (IMPB) Command List (RI and EI Mode Only)...............................437
Chapter 43 IP Multicast (IPMC) Command List (RI Mode Only) .........................................................460
Chapter 44 IP Route Filter Command List (RI Mode Only) .................................................................462
Chapter 45 IP Tunnel Command List (RI Mode Only).........................................................................469
Chapter 46 IPv6 Neighbor Discover Command List............................................................................477
Chapter 47 IPv6 Route Command List (RI and EI Mode Only)...........................................................484
Chapter 48 Japanese Web-Based Access Control (JWAC) Command List .......................................487
Chapter 49 Jumbo Frame Command List............................................................................................511
Chapter 50 Layer 2 Protocol Tunneling (L2PT) Command List...........................................................513
Chapter 51 Link Aggregation Command List.......................................................................................517
Chapter 52 Link Layer Discovery Protocol (LLDP) Command List......................................................524
Chapter 53 Loopback Detection (LBD) Command List........................................................................550
Chapter 54 Loopback Interface Command List ...................................................................................556
Chapter 55 MAC Notification Command List .......................................................................................559
Chapter 56 MAC-based Access Control Command List......................................................................564
Chapter 57 MAC-based VLAN Command List.....................................................................................581
Chapter 58 MD5 Configuration Command List (RI Mode Only) ..........................................................584
Chapter 59 Mirror Command List.........................................................................................................587
Chapter 60 Multicast Listener Discovery Protocol (MLD) Command List (RI Mode Only)..................592
Chapter 61 MLD Proxy Command List (RI Mode Only).......................................................................595
Chapter 62 MLD Snooping Command List ..........................................................................................600
Chapter 63 MSTP debug enhancement Command List......................................................................620
Chapter 64 Multicast Filter Command List...........................................................................................627
Chapter 65 Multicast VLAN Command List .........................................................................................638
Chapter 66 Network Load Balancing (NLB) Command List ................................................................652
Chapter 67 Network Monitoring Command List...................................................................................658
Chapter 68 OAM Command List (RI and EI Mode Only).....................................................................665
Chapter 69 Open Shortest Path First (OSPF) Version 2 Command List (RI Mode Only)...................673

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Chapter 70 OSPF Version 3 Command List (RI Mode Only) ..............................................................694
Chapter 71 Password Recovery Command List..................................................................................713
Chapter 72 Peripherals Command List................................................................................................716
Chapter 73 Ping Command List...........................................................................................................722
Chapter 74 Policy Route Command List (RI Mode Only)....................................................................725
Chapter 75 Port Security Command List .............................................................................................728
Chapter 76 Power over Ethernet (PoE) Command List.......................................................................736
Chapter 77 Power Saving Command List............................................................................................741
Chapter 78 PPPoE Circuit ID Insertions Command List (RI and EI Mode Only).................................747
Chapter 79 Protocol Independent Multicast (PIM) Command List (RI Mode Only).............................751
Chapter 80 PIM for IPv6 Command List (RI Mode Only).....................................................................769
Chapter 81 Protocol VLAN Command List ..........................................................................................788
Chapter 82 QinQ Command List (RI and EI Mode Only).....................................................................794
Chapter 83 Quality of Service (QoS) Command List...........................................................................802
Chapter 84 Remote Switched Port ANalyzer (RSPAN) Command List...............................................819
Chapter 85 Routing Information Protocol (RIP) Command List (RI Mode Only).................................825
Chapter 86 RIPng Command List (RI Mode Only)...............................................................................830
Chapter 87 Routing Command List......................................................................................................836
Chapter 88 RPC PortMapper Command List.......................................................................................852
Chapter 89 Safeguard Engine Command List.....................................................................................854
Chapter 90 SD Card Management Command List..............................................................................856
Chapter 91 Secure Shell (SSH) Command List...................................................................................863
Chapter 92 Secure Sockets Layer (SSL) Command List ....................................................................874
Chapter 93 Spanning Tree Protocol (STP) Command List..................................................................881
Chapter 94 Surveillance VLAN Command List....................................................................................894
Chapter 95 sFlow Command List (RI and EI Mode Only)....................................................................900
Chapter 96 Show Technical Support Command List...........................................................................912
Chapter 97 Simple Mail Transfer Protocol (SMTP) Command List.....................................................915
Chapter 98 Simple Network Management Protocol (SNMP) Command List ......................................920
Chapter 99 Single IP Management Command List .............................................................................949
Chapter 100 Stacking Command List (EI and SI Mode Only) ...............................................................959
Chapter 101 Static Multicast Route Command List (RI Mode Only)......................................................967
Chapter 102 Syslog and Trap Source-interface Command List............................................................970
Chapter 103 System Log Command List...............................................................................................974
Chapter 104 System Severity Command List........................................................................................986
Chapter 105 Telnet Client Command List..............................................................................................988

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Chapter 106TFTP Client Command List...............................................................................................989
Chapter 107 Time and SNTP Command List ........................................................................................994
Chapter 108 Trace Route Command List ............................................................................................1002
Chapter 109 Traffic Control Command List .........................................................................................1005
Chapter 110 Traffic Segmentation Command List...............................................................................1011
Chapter 111 Trusted Host Command List ...........................................................................................1013
Chapter 112 UDP Helper Command List.............................................................................................1017
Chapter 113 Virtual Router Redundancy Protocol (VRRP) Command List (RI Mode Only) ...............1022
Chapter 114 VLAN Trunking Command List........................................................................................1029
Chapter 115 Voice VLAN Command List.............................................................................................1034
Chapter 116 Web-Based Access Control (WAC) Command List........................................................1045
Chapter 117 Weighted Random Early Detection (WRED) Command List..........................................1060
Appendix A Password Recovery Procedure.......................................................................................1067
Appendix B System Log Entries.........................................................................................................1069
Appendix C Trap Log Entries..............................................................................................................1083
Appendix D RADIUS Attributes Assignment.......................................................................................1101

xStack® DGS-3120 Series Layer 3 Managed Gigabit Switch CLI Reference Guide
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Chapter 1 Using Command Line
Interface
The Switch can be managed through the Switch’s serial port, Telnet, SNMP 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. Every command
will be introduced in terms of purpose, format, description, parameters, and examples.
Configuration and management of the Switch via the Web-based management agent are
discussed in the Web UI Reference Guide. For detailed information on installing hardware please
also refer to the Hardware Installation Guide.
1-1 Accessing the Switch via the Serial Port
The Switch’s serial port’s default settings are as follows:
• 115200 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 Console port via an included
RS-232 to RJ-45 convertor cable.
With the serial port properly connected to a management computer, the following screen should be
visible.
DGS-3120-24TC Gigabit Ethernet Switch
Command Line Interface
Firmware: Build 3.00.522
Copyright(C) 2013 D-Link Corporation. All rights reserved.
UserName:
PassWord:
DGS-3120-24TC:admin#
There is no initial username or password. Just press the Enter key twice to display the CLI input
cursor −DGS-3120-24TC:admin# .This is the command line where all commands are input.
1-2 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

xStack® DGS-3120 Series Layer 3 Managed Gigabit Switch CLI Reference Guide
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default IP address is 10.90.90.90. You 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 V3.00.501
-------------------------------------------------------------------------------
Power On Self Test ........................................ 100 %
MAC Address : 00-01-02-03-04-00
H/W Version : B1
Please Wait, Loading V3.00.522 Runtime Image .............. 100 %
UART init ................................................. 100 %
Starting runtime image
Device Discovery .......................................... /
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.
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.
Alternatively, you 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.
DGS-3120-24TC:admin# config ipif System ipaddress 10.24.22.100/255.0.0.0
Command: config ipif System ipaddress 10.24.22.100/8
Success.
DGS-3120-24TC:admin#
In the above example, the Switch was assigned an IP address of 10.24.22.100 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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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.
..
?
cable_diag ports
cd
cfm linktrace
cfm lock md
cfm loopback
change drive
clear
clear address_binding dhcp_snoop binding_entry ports
clear address_binding nd_snoop binding_entry ports
clear arptable
clear attack_log
clear cfm pkt_cnt
clear counters
clear dhcp binding
clear dhcp conflict_ip
clear ethernet_oam ports
clear fdb
clear igmp_snooping statistics counter
clear jwac auth_state
clear log
CTRL+C ESC qQuit SPACE nNext Page ENTER Next Entry aAll
When entering a command without its required parameters, the CLI will prompt you with a Next
possible completions: message.
DGS-3120-24TC:admin#config account
Command: config account
Next possible completions:
<username 15>
DGS-3120-24TC:admin#
In this case, the command config account was entered with the parameter <username 15>. The
CLI will then prompt to enter the <username 15> 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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DGS-3120-24TC:admin#config account
Command: config account
Next possible completions:
<username 15>
DGS-3120-24TC:admin#config account
In the above example, the command config account was entered without the required parameter
<username 15>, the CLI returned the Next possible completions: <username 15> 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.
DGS-3120-24TC:admin#the
Available commands:
.. ? cable_diag cd
cfm change clear config
copy create debug del
delete dir disable download
enable erase execute format
install login logout md
move no ping ping6
rd reboot reconfig rename
reset save show smtp
telnet traceroute traceroute6 upload
DGS-3120-24TC:admin#
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, entering the show command with no additional parameters, the CLI will then display
all of the possible next parameters.
DGS-3120-24TC:admin#show
Command: show
Next possible completions:
802.1p 802.1x aaa access_profile
account accounting acct_client address_binding
arp_spoofing_prevention arpentry asymmetric_vlan
attack_log auth_client auth_diagnostics
auth_session_statistics auth_statistics authen

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authen_enable authen_login authen_policy authentication
authorization autoconfig backup bandwidth_control
boot_file bpdu_protection cfm command
command_history community_encryption config
cpu cpu_filter current_config ddm
device_status dhcp dhcp_local_relay dhcp_relay
dhcp_server dhcpv6_relay dlms
dot1v_protocol_group dscp duld
dvmrp ecmp eee
egress_access_profile egress_flow_meter environment
erps error ethernet_oam execute_config
fdb filter flow_meter gratuitous_arp
greeting_message gvrp hol_prevention igmp
igmp_proxy igmp_snooping ip ip_tunnel
ipfdb ipif ipif_ipv6_link_local_auto
ipmc ipmroute iproute ipv6
ipv6route jumbo_frame jwac l2protocol_tunnel
lacp_port led limited_multicast_addr
link_aggregation lldp lldp_med log
log_save_timing log_software_module loopback
loopdetect mac_based_access_control
mac_based_access_control_local mac_based_vlan mac_notification
max_mcast_group mcast_filter_profile md5
mirror mld mld_proxy mld_snooping
multicast multicast_fdb nlb ospf
ospfv3 packet password_recovery per_queue
pim pim-ssm pim6 poe
policy_route port port_group port_security
port_security_entry port_vlan ports
power_saving pppoe private_vlan pvid
qinq radius rip ripng
rmon route route_map router_ports
rspan safeguard_engine scheduling
scheduling_mechanism serial_port session
sflow sim smtp snmp
sntp ssh ssl stack_device
stack_information stacking_mode storage_media_info
stp surveillance_vlan switch syslog
system_severity tech_support terminal time
time_range traffic traffic_segmentation
trap trusted_host udp_helper utilization
vlan vlan_translation vlan_trunk voice_vlan
vrrp wac wred
DGS-3120-24TC:admin#
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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1-3 Command Syntax Symbols
Syntax
Description
angle brackets < >
Encloses a variable or value. Users must specify the variable or value.
For example, in the syntax
config command_history <value 1-40>
users must enter how many entries for <value 1-40> when entering the
command. DO NOT TYPE THE ANGLE BRACKETS.
square brackets [ ]
Encloses a required value or list of required arguments. Only one value or
argument must be specified. For example, in the syntax
create account [admin | operator | power_user | user] <username 15>
{encrypt [plain_text | sha_1] <password>}
users must specify either the admin, operator, power_user or user-level
account when entering the command. DO NOT TYPE THE SQUARE
BRACKETS.
vertical bar |
Separates mutually exclusive items in a list. For example, in the syntax
reset {[config | system]} {force_agree}
users must specify either the community or trap receiver in the command.
DO NOT TYPE THE VERTICAL BAR.
braces { }
Encloses an optional value or a list of optional arguments. One or more
values or arguments can be specified. For example, in the syntax
reset {[config | system]} {force_agree}
users may choose configure or system in the command. DO NOT TYPE
THE BRACES.
parentheses ( )
Indicates at least one or more of the values or arguments in the preceding
syntax enclosed by braces must be specified. For example, in the syntax
config bpdu_protection ports [<portlist> | all] {state [enable | disable] |
mode [drop | block | shutdown]}(1)
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.
ipif <ipif_name 12>
metric <value 1-31>
12 means the maximum length of the IP interface name.
1-31 means the legal range of the metric value.
1-4 Line Editing Keys
Keys
Description
Delete
Delete character under cursor and shift remainder of line to left.
Backspace
Delete character to left of cursor and shift remainder of line to left.
CTRL+R
Toggle on and off. When toggled on, inserts text and shifts previous
text to right.

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Left Arrow
Move cursor to left.
Right Arrow
Move cursor to right
Tab
Help user to select appropriate token.
P or p
Display the previous page.
N, n or Space
Display the next page.
CTRL+C
Escape from displayed pages.
ESC
Escape from displayed pages.
Q or q
Escape from displayed pages.
R or r
refresh the displayed pages
A or a
Display the remaining pages. (The screen display will not pause again.)
Enter
Display the next line.
The screen display pauses when the show command output reaches the end of the page.
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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Chapter 2 Basic Command List
show session
show serial_port
config serial_port {baud_rate [9600 | 19200 | 38400 | 115200] | auto_logout [never | 2_minutes |
5_minutes | 10_minutes | 15_minutes]}
enable clipaging
disable clipaging
login
logout
?
clear
show command_history
config command_history <value 1-40>
config greeting_message {default}
show greeting_message
config command_prompt [<string 16> | username | default]
config terminal width [default | <value 80-200>]
show terminal width
config ports [<portlist> | all ] {medium_type [fiber | copper]} {speed [auto | 10_half | 10_full |
100_half | 100_full | 1000_full {[master | slave]}] | flow_control [enable | disable] | learning
[enable | disable] | state [enable | disable] | mdix [auto | normal | cross] | [description <desc 1-
32> | clear_description]}
show ports {<portlist>} {[description | err_disabled | details | media_type]}
2-1 show session
Description
This command is used to display a list of currently users which are login to CLI sessions.
Format
show session
Parameters
None.
Restrictions
Only Administrator and Operator-level users can issue this command.
Example
To disable the password encryption:

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DGS-3120-24TC:admin#show session
Command: show session
ID Live Time From Level User
--- ------------ --------------------------------------- ----- ---------------
8 00:04:17.870 Serial Port admin Anonymous
Total Entries: 1
CTRL+C ESC qQuit SPACE nNext Page pPrevious Page rRefresh
2-2 show serial_port
Description
This command is used to display the current serial port settings.
Format
show serial_port
Parameters
None.
Restrictions
None.
Example
To display the serial port setting:
DGS-3120-24TC:admin# show serial_port
Command: show serial_port
Baud Rate : 9600
Data Bits : 8
Parity Bits : None
Stop Bits : 1
Auto-Logout : 10 minutes
DGS-3120-24TC:admin#
2-3 config serial_port
Description
This command is used to configure the serial bit rate that will be used to communicate with the
management host and the auto logout time for idle connections.

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Format
config serial_port {baud_rate [9600 | 19200 | 38400 | 115200] | auto_logout [never |
2_minutes | 5_minutes | 10_minutes | 15_minutes]}
Parameters
baud_rate - (Optional) The serial bit rate that will be used to communicate with the management
host. The default baud rate is 115200.
9600 - Specify the serial bit rate to be 9600.
19200 - Specify the serial bit rate to be 19200.
38400 - Specify the serial bit rate to be 38400.
115200 - Specify the serial bit rate to be 115200.
auto_logout - (Optional) The auto logout time out setting:
never - Never timeout.
2_minutes - When idle over 2 minutes, the device will auto logout.
5_minutes - When idle over 5 minutes, the device will auto logout.
10_minutes - When idle over 10 minutes, the device will auto logout.
15_minutes - When idle over 15 minutes, the device will auto logout.
Restrictions
Only Administrator and Operator-level users can issue this command.
Example
To configure baud rate:
DGS-3120-24TC:admin# config serial_port baud_rate 9600
Command: config serial_port baud_rate 9600
Success.
DGS-3120-24TC:admin#
2-4 enable clipaging
Description
This command is used to enable the pausing of the screen display when the show command
output reaches the end of the page. For those show commands that provide the display refresh
function, the display will not be refreshed when clipaging is disabled. The default setting is enabled.
Format
enable clipaging
Parameters
None.

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Restrictions
Only Administrator and Operator-level users can issue this command.
Example
To enable pausing of the screen display when show command output reaches the end of the page:
DGS-3120-24TC:admin# enable clipaging
Command: enable clipaging
Success.
DGS-3120-24TC:admin#
2-5 disable clipaging
Description
This command is used to disable the pausing of the screen display when the show command
output reaches the end of the page. The default setting is enabled.
Format
disable clipaging
Parameters
None.
Restrictions
Only Administrator and Operator-level users can issue this command.
Example
To disable pausing of the screen display when show command output reaches the end of the page:
DGS-3120-24TC:admin# disable clipaging
Command: disable clipaging
Success.
DGS-3120-24TC:admin#
2-6 login
Description
This command is used to allow user login to the Switch.

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Format
login
Parameters
None.
Restrictions
None.
Example
To login the Switch with a user name dlink:
DGS-3120-24TC:admin# login
Command: login
UserName:dlink
PassWord:****
DGS-3120-24TC:admin#
2-7 logout
Description
This command is used to logout the facility.
Format
logout
Parameters
None.
Restrictions
None.
Example
To logout current user:

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DGS-3120-24TC:admin# logout
Command: logout
**********
* Logout *
**********
Press any key to login...
DGS-3120-24TC Gigabit Ethernet Switch
Command Line Interface
Firmware: Build 3.00.522
Copyright(C) 2013 D-Link Corporation. All rights reserved.
UserName:
2-8 ?
Description
This command is used to display the usage description for all commands in the cuurent login
account level or the specific one.
Format
?
Parameters
None.
Restrictions
None.
Example
To get “ping” command usage, descriptions:
DGS-3120-24TC:admin#? ping
Command: ? ping
Command: ping
Usage: <ipaddr> { times <value 1-255> | timeout <sec 1-99>}
Description: Used to test the connectivity between network devices.
DGS-3120-24TC:admin#

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2-9 clear
Description
The command is used to clear screen.
Format
clear
Parameters
None.
Restrictions
None.
Example
To clear screen:
DGS-3120-24TC:admin# clear
Command: clear
DGS-3120-24TC:admin#
2-10 show command_history
Description
The command is used to display command history.
Format
show command_history
Parameters
None.
Restrictions
None.
Example
To display command history:

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DGS-3120-24TC:admin#show command_history
Command: show command_history
? ping
login
show serial_port
show session
? config bpdu_protection ports
? reset
? create account
? create ipif
show
the
?
DGS-3120-24TC:admin#
2-11 config command_history
Description
This command is used to configure the number of commands that the Switch can recall. The
Switch “remembers” upto the last 40 commands you entered.
Format
config command_history <value 1-40>
Parameters
<value 1-40> - Enter the number of commands that the Switch can recall. This value must be
between 1 and 40.
Restrictions
None.
Example
To configure the number of command history:
DGS-3120-24TC:admin# config command_history 25
Command: config command_history 25
Success.
DGS-3120-24TC:admin#
2-12 config greeting_message
Description
This command is used to configure the greeting message (or banner).