H3C LS-5100-16P-SI-OVS-H3 Kurzanleitung

DHCP

H3C Low-End Ethernet Switches Configuration Examples Table of Contents

Table of Contents

Chapter 1 DHCP Functions Overview .........................................................................................1-1

1.1 Supported DHCP Functions .............................................................................................. 1-1

1.1.1 DHCP Functions Supported by the H3C Low-End Ethernet Switches...................1-1

1.2 Configuration Guide...........................................................................................................1-2

1.2.1 Configuring the DHCP Server.................................................................................1-2

1.2.2 Configuring the DHCP Relay Agent........................................................................1-8

1.2.3 Configuring DHCP Snooping ..................................................................................1-9

Chapter 2 Configuration Examples ............................................................................................. 2-1

2.1 DHCP Server Configuration Example................................................................................2-1

2.1.1 Network Requirements............................................................................................2-1

2.1.2 Network Diagram.....................................................................................................2-2

2.1.3 Configuration Procedure.........................................................................................2-2

2.2 DHCP Relay Agent/Snooping Configuration Examples ....................................................2-4

2.2.1 Network Requirements............................................................................................2-4

2.2.2 Network Diagram.....................................................................................................2-5

2.2.3 Configuration Procedure.........................................................................................2-6

2.3 Precautions......................................................................................................................2-11

2.3.1 Cooperation Between DHCP Relay Agent and IRF..............................................2-11

Chapter 3 Related Documents.....................................................................................................3-1

3.1 Protocols and Standards ...................................................................................................3-1

DHCP

H3C Low-End Ethernet Switches Configuration Examples Abstract

DHCP Configuration Examples

Keywords: DHCP, Option 82

Abstract: This document describes DHCP configuration and application on Ethernet

switches in specific networking environments. Based on the different roles

played by the devices in the network, the functions and applications of DHCP

server, DHCP relay agent, DHCP snooping, and DHCP Option 82 are covered.

Acronym: DHCP (Dynamic Host Configuration Protocol).

DHCP

H3C Low-End Ethernet Switches Configuration Examples Chapter 1 DHCP Functions Overview

1-1

Chapter 1 DHCP Functions Overview

1.1 Supported DHCP Functions

1.1.1 DHCP Functions Supported by the H3C Low-End Ethernet Switches

Table 1-1 DHCP functions supported by the H3C low-end ethernet switches

Function

Model DHCP server DHCP relay

agent DHCP snooping

S3600-EI zzz

S3600-SI —

S5600 zzz

S3610 zzz

S5510 zzz

S5500-SI —

S5100 — —

S3100 — —

Depending on the models, the H3C low-end switches can support part or all of the

following DHCP functions:

DHCP server:

zDHCP server using global address pool/interface address pool

zIP address lease configuration

zAllocation of gateway addresses, DNS server addresses, WINS server addresses

to DHCP clients

zStatic bindings for special addresses

zDHCP server security functions: detection of unauthorized DHCP servers and

detection of duplicate IP addresses

DHCP relay agent:

zDHCP relay agent

zDHCP relay agent security functions: address checking, DHCP server handshake,

and periodic update of client address entries

zDHCP Option 82

DHCP snooping:

zDHCP snooping

DHCP

H3C Low-End Ethernet Switches Configuration Examples Chapter 1 DHCP Functions Overview

1-2

zDHCP snooping security functions: DHCP snooping entry update and ARP source

checking

zDHCP Option 82

Note:

Refer to respective user manuals for detailed descriptions of the DHCP functions

supported by different models.

1.2 Configuration Guide

Note:

zThe configuration varies with product models. The following configuration takes the

S3600 series as an example. Refer to respective operation manuals for the

configurations on other models.

zOnly basic configuration steps are listed below. Refer to respective operation and

command manuals for the operating principles and applications of the functions.

1.2.1 Configuring the DHCP Server

The DHCP server can be configured to assign IP addresses from a global or interface

address pool. These two configuration methods are applicable to the following

environments:

zIf the DHCP server and DHCP clients are on the same network segment, both

methods can be applied.

zIf the DHCP server and DHCP clients are on different network segments, the

DHCP server can only be configured to assign IP addresses from a globaladdress

pool.

1) Use the following commands to configure the DHCP server to assign IP addresses

from a global address pool.

Table 1-2 Configure IP address allocation from a global address pool

Operation Command Description

Enter system view system-view —

Enable the DHCP

service dhcp enable Optional

By default, the DHCP

service is enabled.

DHCP

H3C Low-End Ethernet Switches Configuration Examples Chapter 1 DHCP Functions Overview

1-3

Operation Command Description

Create a DHCP address

pool and enter DHCP

address pool view dhcp server ip-pool pool-name

Required

By default, no global

DHCP address pool

is created.

Configure an IP address

range for dynamic

allocation

network ip-address

[ mask-length | mask mask ]

Required

By default, no IP

address range is

configured for

dynamic allocation.

Configure the lease

period of dynamically

allocated IP addresses

expired { day day [ hour hour

[ minute minute ] ] | unlimited }

Optional

IP address lease

period defaults to

one day.

Configure a domain

name for DHCP clients domain-name domain-name

Required

By default, no

domain name is

configured for DHCP

clients.

Configure DNS server

addresses for DHCP

clients dns-list ip-address&<1-8>

Required

By default, no DNS

server addresses are

configured.

Configure WINS server

addresses for DHCP

clients nbns-list ip-address&<1-8>

Required

By default, no WINS

server addresses are

configured.

Specify a NetBIOS node

type for DHCP clients netbios-type { b-node | h-node

|m-node | p-node }

Optional

By default, the DHCP

clients are h-nodes if

the command is not

specified.

Configure gateway

addresses for DHCP

clients gateway-list ip-address&<1-8>

Required

By default, no

gateway address is

configured.

Configure a self-defined

DHCP option

option code { ascii ascii-string |

hex hex-string&<1-10> |

ip-address ip-address&<1-8> }

Required

By default, no

self-defined option is

configured.

DHCP

H3C Low-End Ethernet Switches Configuration Examples Chapter 1 DHCP Functions Overview

1-4

Operation Command Description

Return to

system view quit

Create an

address pool for

the static

address binding

dhcp server ip-pool pool-name

Specify the IP

address of the

static binding

static-bind ip-address

ip-address [ mask-length | mask

mask ]

Specify

the MAC

address

of the

static

binding

static-bind mac-address

mac-address

Confi

gure

static

bindi

Spe

cify

the

addr

ess

the

clie

the

stati

bind

ing

Specify

the client

ID of the

static

binding

static-bind client-identifier

client-identifier

Optional

By default, no MAC

address or client ID

is bound to an IP

address statically.

Note:

zTo configure a

static binding, you

need to specify

the IP address

and the MAC

address or client

ID.

zA static address

pool can be

configured with

only one IP

address-to-MAC

or IP

address-to-client

ID binding.

Return to system view quit —

Specify the IP

addresses to be

excluded from

automatic allocation

dhcp server forbidden-ip

low-ip-address

[ high-ip-address ]

Optional

By default, all the IP

addresses in a

DHCP address pool

are available for

dynamic allocation.

interface interface-type

interface-number

dhcp select global

On the

current

interface quit

Configure

the global

address

pool mode On

multiple

interfaces

in system

view

dhcp select global { interface

interface-type interface-number

[ to interface-type

interface-number ] | all }

Optional

By default, an

interface operates in

the global address

pool mode.

DHCP

H3C Low-End Ethernet Switches Configuration Examples Chapter 1 DHCP Functions Overview

1-5

Operation Command Description

Enable the detection of

unauthorized DHCP

servers dhcp server detect

Required

By default, the

detection of

unauthorized DHCP

servers is disabled.

Set the

maximum

number of

ping

packets

sent by the

DHCP

server for

each IP

address

dhcp server ping packets

number

Optional

The default

maximum number is

Configure

duplicate

address

detection Set a

response

timeout for

each ping

packet

dhcp server ping timeout

milliseconds

Optional

The default timeout

is 500 milliseconds.

Enable the DHCP

server to support Option

dhcp server relay information

enable

Optional

By default, the DHCP

server supports

Option 82.

2) Use the following commands to configure IP address allocation through the

interface address pool.

Table 1-3 Configure IP address allocation through the interface address pool

Operation Command Description

Enter system view system-view —

Enable the DHCP

service dhcp enable Optional

By default, the DHCP

service is enabled.

Configure multiple or all

the VLAN interfaces to

operate in interface

address pool mode

dhcp select interface

{ interface interface-type

interface-number [ to

interface-type

interface-number ] | all }

Optional

interface interface-type

interface-number

Configure a VLAN

interface to operate in

interface address pool

mode dhcp select interface

Required

By default, a VLAN

interface operates in

global address pool

mode.

DHCP

H3C Low-End Ethernet Switches Configuration Examples Chapter 1 DHCP Functions Overview

1-6

Operation Command Description

Bind an IP address

statically to a client MAC

address or client ID

dhcp server static-bind

ip-address ip-address

{client-identifier

client-identifier | mac-address

mac-address }

Optional

By default, no static

binding is configured

On the current

interface

dhcp server expired { day day

[ hour hour [ minute minute ] ] |

unlimited }

quit

Config

ure the

lease

period

dynami

cally

allocat

ed IP

addres

ses

On multiple

interfaces in

system view

dhcp server expired { day day

[ hour hour [ minute minute ] ] |

unlimited } { interface

interface-type interface-number

[ to interface-type

interface-number ] | all }

Optional

IP address lease

period defaults to

one day.

Return to system view quit —

Specify the IP addresses

to be excluded from

automatic allocation

dhcp server forbidden-ip

low-ip-address

[ high-ip-address ]

Optional

By default, all the IP

addresses in an

interface address

pool are available for

dynamic allocation.

interface interface-type

interface-number

dhcp server domain-name

domain-name

On one

interface

quit

Configure

a domain

name for

DHCP

clients On multiple

interfaces

dhcp server domain-name

domain-name { interface

interface-type interface-number

[ to interface-type

interface-number ] | all }

Optional

By default, no

domain name is

configured for DHCP

clients.

interface interface-type

interface-number

dhcp server dns-list

ip-address&<1-8>

On one

interface

quit

Configure

DNS

server

addresses

for DHCP

clients On multiple

interfaces

dhcp server dns-list

ip-address&<1-8> { interface

interface-type interface-number

[ to interface-type

interface-number ] | all }

Optional

By default, no DNS

server address is

configured.

DHCP

H3C Low-End Ethernet Switches Configuration Examples Chapter 1 DHCP Functions Overview

1-7

Operation Command Description

interface interface-type

interface-number

dhcp server nbns-list

ip-address&<1-8>

On one

interface

quit

Configure

WINS

server

addresses

for DHCP

clients On multiple

interfaces

dhcp server nbns-list

ip-address&<1-8> { interface

interface-type interface-number

[ to interface-type

interface-number ] | all }

Optional

By default, no WINS

server addresses are

configured.

interface interface-type

interface-number

dhcp server netbios-type

{ b-node | h-node | m-node |

p-node }

On one

interface

quit

Define a

NetBIOS

node type

for DHCP

clients

On multiple

interfaces

dhcp server netbios-type

{ b-node | h-node | m-node |

p-node } { interface

interface-type interface-number

[ to interface-type

interface-number ] | all }

Optional

By default, no

NetBIOS node type

is specified and a

DHCP client uses the

h-node type.

interface interface-type

interface-number

dhcp server option code

{ ascii ascii-string | hex

hex-string&<1-10> | ip-address

ip-address&<1-8> }

On one

interface

quit

Configure

self-define

d DHCP

option

On multiple

interfaces

dhcp server option code

{ ascii ascii-string | hex

hex-string&<1-10> | ip-address

ip-address&<1-8> } { interface

interface-type interface-number

[ to interface-type

interface-number ] | all }

Optional

By default, no

self-defined option is

configured.

Enable the detection of

unauthorized DHCP

servers dhcp server detect

Optional

By default, the

detection of

unauthorized DHCP

servers is disabled.

DHCP

H3C Low-End Ethernet Switches Configuration Examples Chapter 1 DHCP Functions Overview

1-8

Operation Command Description

Set the

maximum

number of

ping

packets

sent by the

DHCP

server for

each IP

address

dhcp server ping packets

number

Optional

The default

maximum number is

Configure

duplicate

address

detection Set a

response

timeout for

each ping

packet

dhcp server ping timeout

milliseconds

Optional

The default timeout

is 500 milliseconds.

Enable the DHCP server

to support Option 82 dhcp server relay information

enable

Optional

By default, the DHCP

server supports

Option 82.

1.2.2 Configuring the DHCP Relay Agent

Use the following commands to configure the DHCP relay agent.

Table 1-4 Configure DHCP relay agent

Operation Command Description

Enter system view system-view —

Enable the DHCP service dhcp enable Optional

By default, the DHCP

service is enabled.

Configure DHCP server

IP addresses for a DHCP

server group

dhcp-server groupNo ip

ip-address&<1-8>

Required

By default, no DHCP

server IP address is

configured for a DHCP

server group.

Configure a DHCP user

address entry dhcp-security static

ip-address mac-address

Optional

By default, no DHCP user

address entry is

configured.

Enable DHCP relay agent

handshake dhcp relay hand enable

Optional

By default, DHCP relay

agent handshake is

enabled.

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