Contents

DHCP commands· 1

DHCP client commands· 1

dhcp client dad enable· 1

dhcp client dscp· 2

display dhcp client 2

ip address dhcp-alloc· 5

BOOTP client commands· 5

display bootp client 5

ip address bootp-alloc· 6

DHCP commands

The following compatibility matrixes show the support of hardware platforms for DHCP:

 

Series	Models	DHCP compatibility
L5000 series	L5000-C, L5000-S	Yes
	L5000-E, L5030, L5060, L5080, L5000-AK535	No
L1000 series	L1000-C, L1000-S, L1000-M, L1000-E, L1000-AK310, L1000-AK315, L1000-AK320, L1000-AK325, L1000-AK330, L1000-AK390, L1030, L1050, L1070, L1090	Yes
L100 series	L100-C	Yes
Modules	LSU1ADECEA0, LSWM1ADED0, LSQM1ADEDSC0	Yes

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DHCP client commands

dhcp client dad enable

Use dhcp client dad enable to enable duplicate address detection.

Use undo dhcp client dad enable to disable duplicate address detection.

Syntax

dhcp client dad enable

undo dhcp client dad enable

Default

Duplicate address detection is enabled.

Views

System view

Predefined user roles

network-admin

context-admin

Usage guidelines

DHCP client detects IP address conflict through ARP packets. An attacker can act as the IP address owner to send an ARP reply. This makes the client unable to use the IP address assigned by the server. As a best practice, disable duplicate address detection when ARP attacks exist on the network.

Examples

# Disable the duplicate address.

<Sysname> system-view

[Sysname] undo dhcp client dad enable

dhcp client dscp

Use dhcp client dscp to set the DSCP value for DHCP packets sent by the DHCP client.

Use undo dhcp client dscp to restore the default.

Syntax

dhcp client dscp dscp-value

undo dhcp client dscp

Default

The DSCP value is 56 in DHCP packets sent by the DHCP client.

Views

System view

Predefined user roles

network-admin

context-admin

Parameters

dscp-value: Sets the DSCP value for DHCP packets, in the range of 0 to 63.

Usage guidelines

The DSCP value of a packet specifies the priority level of the packet and affects the transmission priority of the packet. A bigger DSCP value represents a higher priority.

Examples

# Set the DSCP value to 30 for DHCP packets sent by the DHCP client.

<Sysname> system-view

[Sysname] dhcp client dscp 30

display dhcp client

Use display dhcp client to display DHCP client information.

Syntax

display dhcp client [ verbose ] [ interface interface-type interface-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

context-admin

context-operator

Parameters

verbose: Displays detailed DHCP client information. If you do not specify this keyword, the command displays brief DHCP client information.

interface interface-type interface-number: Specifies an interface by its type and number. If you do not specify an interface, this command displays DHCP client information on all interfaces.

Examples

# Display brief DHCP client information on all interfaces.

<Sysname> display dhcp client

GigabitEthernet1/0/1 DHCP client information:

 Current state: BOUND

 Allocated IP: 40.1.1.20 255.255.255.0

 Allocated lease: 259200 seconds, T1: 129600 seconds, T2: 226800 seconds

 DHCP server: 40.1.1.2

# Display detailed DHCP client information on all interfaces.

<Sysname> display dhcp client verbose

GigabitEthernet1/0/1 DHCP client information:

 Current state: BOUND

 Allocated IP: 40.1.1.20 255.255.255.0

 Allocated lease: 259200 seconds, T1: 129600 seconds, T2: 226800 seconds

 Lease from May 21 19:00:29 2012   to   May 31 19:00:29 2012

 DHCP server: 40.1.1.2

 Transaction ID: 0x1c09322d

 Default router: 40.1.1.2

Classless static routes:

   Destination: 1.1.0.1, Mask: 255.0.0.0, NextHop: 192.168.40.16

   Destination: 10.198.122.63, Mask: 255.255.255.255, NextHop: 192.168.40.16

 DNS servers: 44.1.1.11 44.1.1.12

 Domain name: ddd.com

 Boot servers: 200.200.200.200  1.1.1.1

 ACS parameter:

   URL: http://192.168.1.1:7547/acs

   Username: bims

   Password: ******

 Client ID type: acsii(type value=00)

 Client ID value: 000c.29d3.8659-GE1/0/1

 Client ID (with type) hex: 0030-3030-632e-3239-

                            6433-2e38-3635-392d-

                            4574-6830-2f30-2f32

 T1 will timeout in 1 day 11 hours 58 minutes 52 seconds.

Table 1 Command output

Field	Description
DHCP client information	Information about the interface that acts as the DHCP client.
Current state	Current state of the DHCP client: ·     HALT—The client stops applying for an IP address. ·     INIT—The initialization state. ·     SELECTING—The client has sent out a DHCP-DISCOVER message in search for a DHCP server and is waiting for the response from DHCP servers. ·     REQUESTING—The client has sent out a DHCP-REQUEST message requesting for an IP address and is waiting for the response from DHCP servers. ·     BOUND—The client has received the DHCP-ACK message from a DHCP server and obtained an IP address successfully. ·     RENEWING—The T1 timer expires. ·     REBOUNDING—The T2 timer expires.
Allocated IP	IP address allocated by the DHCP server.
Allocated lease	Allocated lease time.
T1	1/2 lease time (in seconds) of the DHCP client IP address.
T2	7/8 lease time (in seconds) of the DHCP client IP address.
Lease from….to….	Start and end time of the lease.
DHCP server	DHCP server IP address that assigned the IP address.
Transaction ID	Transaction ID, a random number chosen by the client to identify an IP address allocation.
Default router	Gateway address assigned to the client.
Classless static routes	Classless static routes assigned to the client.
Static routes	Classful static routes assigned to the client.
DNS servers	DNS server address assigned to the client.
Domain name	Domain name suffix assigned to the client.
Boot servers	PXE server addresses (up to 16 addresses) specified for the DHCP client, which are obtained through Option 43.
ACS parameter	Parameters about the ACS.
URL	URL of the ACS.
Username	Username for logging in to the ACS.
Password	Password for logging in to the ACS. If a password is configured, this field displays ******. If no password is configured, this field is not displayed.
Client ID type	DHCP client ID type: ·     If an ASCII string is used as the client ID value, the type value is 00. ·     If the MAC address of a specific interface is used as the client ID value, the type value is 01. ·     If a hexadecimal number is used as the client ID value, the type value is the first two characters in the string.
Client ID value	Value of the DHCP client ID.
Client ID (with type) hex	DHCP client ID with the type field, a hexadecimal number.
T1 will timeout in 1 day 11 hours 58 minutes 52 seconds.	How long the T1 (1/2 lease time) timer will timeout.

 

Related commands

dhcp client identifier

ip address dhcp-alloc

ip address dhcp-alloc

Use ip address dhcp-alloc to configure an interface to use DHCP for IP address acquisition.

Use undo ip address dhcp-alloc to cancel an interface from using DHCP.

Syntax

ip address dhcp-alloc

undo ip address dhcp-alloc

Default

An interface does not use DHCP for IP address acquisition.

Views

Interface view

Predefined user roles

network-admin

context-admin

Usage guidelines

When you execute the undo ip address dhcp-alloc command, the interface sends a DHCP-RELEASE message to release the IP address obtained through DHCP. If the interface is down, the message cannot be sent out. This situation can occur when a subinterface obtained an IP address through DHCP, and the shutdown command is executed on its primary interface. The subinterface will fail to send a DHCP-RELEASE message.

Examples

# Configure GigabitEthernet 1/0/1 to use DHCP for IP address acquisition.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] ip address dhcp-alloc

BOOTP client commands

display bootp client

Use display bootp client to display information about a BOOTP client.

Syntax

display bootp client [ interface interface-type interface-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

context-admin

context-operator

Parameters

interface interface-type interface-number: Specifies an interface by its type and number. If you do not specify an interface, this command displays BOOTP client information on all interfaces.

Examples

# Display BOOTP client information on GigabitEthernet 1/0/1.

<Sysname> display bootp client interface gigabitethernet 1/0/1

GigabitEthernet1/0/1 BOOTP client information:

Allocated IP: 169.254.0.2 255.255.0.0

Transaction ID: 0x3d8a7431

MAC Address: 00e0-fc0a-c3ef

Table 2 Command output

Field	Description
BOOTP client information	Information about the interface that acts as a BOOTP client.
Allocated IP	BOOTP client's IP address allocated by the BOOTP server.
Transaction ID	Value of the XID field in a BOOTP message. The BOOTP client chooses a random number for the XID field when sending a BOOTP request to the BOOTP server. It is used to match a response message from the BOOTP server. If the values of the XID field are different in the BOOTP response and request, the BOOTP client drops the BOOTP response.
Mac Address	MAC address of a BOOTP client.

 

Related commands

ip address bootp-alloc

ip address bootp-alloc

Use ip address bootp-alloc to configure an interface to use BOOTP for IP address acquisition.

Use undo ip address bootp-alloc to cancel an interface from using BOOTP.

Syntax

ip address bootp-alloc

undo ip address bootp-alloc

Default

An interface does not use BOOTP for IP address acquisition.

Views

Interface view

Predefined user roles

network-admin

context-admin

Examples

# Configure GigabitEthernet 1/0/1 to use BOOTP for IP address acquisition.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] ip address bootp-alloc

Related commands

display bootp client