H3C DHCP Manuale utente

DHCP Quick Start Configuration Guide

No part of this manual may be reproduced or transmitted in any form or by any means without prior written consent of New

H3C Technologies Co., Ltd.

Except for the trademarks of NewH3C Technologies Co., Ltd., any trademarks that may bementioned in this document are

the property of their respective owners.

The information in this document is subject to change without notice.

i

Contents

Configuring dynamic IPv4 address assignment ·············································1

Introduction ························································································································································1

Network configuration ········································································································································1

Procedure···························································································································································1

Verifying the configuration··································································································································3

Configuration files ··············································································································································3

Related documentation······································································································································4

Configuring DHCP relay agent·······································································5

Introduction ························································································································································5

Network configuration ········································································································································5

Procedure···························································································································································5

Verifying the configuration··································································································································7

Configuration files ··············································································································································7

Related documentation······································································································································8

Configuring DHCP snooping··········································································9

Introduction ························································································································································9

Network configuration ········································································································································9

Procedure···························································································································································9

Verifying the configuration································································································································10

Configuration files ············································································································································10

Related documentation····································································································································10

Configuring dynamic IPv6 address assignment ···········································11

Introduction ······················································································································································11

Network configuration ······································································································································11

Procedure·························································································································································11

Verifying the configuration································································································································13

Configuration files ············································································································································14

Related documentation····································································································································15

1

Configuring dynamic IPv4 address

assignment

Introduction

The following example describes the basic procedure to configure an interface as a DHCP server for

dynamic IPv4 address assignment.

Network configuration

As shown in Figure 1, the core switch has three VLANs. Host A, Host B, and Host C are in VLAN 5,

VLAN 6, and VLAN 7, respectively. Configure the core switch as a DHCP server to meet the following

requirements:

•

The clients on subnets 192.168.5.0/24, 192.168.6.0/24, and 192.168.7.0/24 can obtain IP

addresses through DHCP.

•

The IP addresses of VLAN-interface 5, VLAN-interface 6, and VLAN-interface 7 on the switch

are 192.168.5.254/24, 192.168.6.254/24, and 192.168.7.254/24, respectively.

•

For the hosts in subnet 192.168.5.0/24, the DNS server IP address is 192.168.5.100 and the

gateway IP address is 192.168.5.254/24.

•

For the hosts in subnet 192.168.6.0/24, the DNS server IP address is 192.168.6.100 and the

gateway IP address is 192.168.6.254/24.

•

For the hosts in subnet 192.168.7.0/24, the DNS server IP address is 192.168.7.100 and the

gateway IP address is 192.168.7.254/24.

Figure 1 Network diagram

Procedure

# Enable DHCP on the switch.

<Switch> system-view

[Switch] dhcp enable

Switch

GE1/0/5

VLAN 5

Host A VLAN 6

Host B VLAN 7

Host C

GE1/0/7

GE1/0/6

2

# Assign GigabitEthernet 1/0/5, GigabitEthernet 1/0/6, GigabitEthernet 1/0/7 to VLAN 5, VLAN 6,

and VLAN 7, respectively.

[Switch] vlan 5

[Switch-vlan5] port gigabitEthernet 1/0/5

[Switch-vlan5] quit

[Switch]vlan 6

[Switch-vlan6] port gigabitEthernet 1/0/6

[Switch-vlan6] quit

[Switch]vlan 7

[Switch-vlan7] port gigabitEthernet 1/0/7

[Switch-vlan7] quit

# Assign IP addresses to VLAN-interface 5, VLAN-interface 6, and VLAN-interface 7. Each VLAN

interface acts as the gateway in the VLAN to which the interface belongs.

[Switch] interface vlan-interface 5

[Switch-Vlan-interface5] ip address 192.168.5.254 255.255.255.0

[Switch-Vlan-interface5] quit

[Switch]interface vlan-interface 6

[Switch-Vlan-interface6] ip address 192.168.6.254 255.255.255.0

[Switch-Vlan-interface6] quit

[Switch]interface vlan-interface 7

[Switch-Vlan-interface7] ip address 192.168.7.254 255.255.255.0

[Switch-Vlan-interface7] quit

# (Optional.) Exclude specific IP addresses (such as DNS server IP addresses) from dynamic IP

address assignment.

[Switch] dhcp server forbidden-ip 192.168.5.100

[Switch] dhcp server forbidden-ip 192.168.6.100

[Switch] dhcp server forbidden-ip 192.168.7.100

# Create IP address pool 5 to assign IP addresses to the clients on subnet 192.168.5.0/24.

[Switch] dhcp server ip-pool 5

[Switch-dhcp-pool-5] network 192.168.5.0 mask 255.255.255.0

[Switch-dhcp-pool-5] dns-list 192.168.5.100

[Switch-dhcp-pool-5] gateway-list 192.168.5.254

[Switch-dhcp-pool-5] quit

# Create IP address pool 6 to assign IP addresses to the clients on subnet 192.168.6.0/24.

[Switch] dhcp server ip-pool 6

[Switch-dhcp-pool-6] network 192.168.6.0 mask 255.255.255.0

[Switch-dhcp-pool-6] dns-list 192.168.6.100

[Switch-dhcp-pool-6] gateway-list 192.168.6.254

[Switch-dhcp-pool-6] quit

# Create IP address pool 7 to assign IP addresses to the clients on subnet 192.168.7.0/24.

[Switch] dhcp server ip-pool 7

[Switch-dhcp-pool-7] network 192.168.7.0 mask 255.255.255.0

[Switch-dhcp-pool-7] dns-list 192.168.7.100

[Switch-dhcp-pool-7] gateway-list 192.168.7.254

[Switch-dhcp-pool-7] quit

3

Verifying the configuration

# Check the IP addresses and other network settings of Host A, Host B, and Host C. Use the

display dhcp server ip-in-use command to view the IP addresses assigned by the DHCP

server.

[Switch] display dhcp server ip-in-use

IP address Client-identifier/ Lease expiration Type

Hardware address

192.168.5.1 0031-3865-392e-6262-Jan 14 22:25:03 2021 Auto(C)

3363-2e30-3230-352d-

4745-302f-30

192.168.6.2 0031-fe65-4203-7e02-Jan 14 22:25:03 2021 Auto(C)

3063-5b30-3230-4702-

620e-712f-5e

192.168.7.3 3030-3030-2e30-3030-Jan 9 10:45:11 2021 Auto(C)

662e-3030-3033-2d45-

7568-6572-1e

The output shows that the DHCP server can assign IP addresses and other network settings to the

clients on subnets 192.168.5.0/24, 192.168.6.0/24, and 192.168.7.0/24 correctly.

Configuration files

•

Switch:

#

dhcp enable

dhcp server forbidden-ip 192.168.5.100

dhcp server forbidden-ip 192.168.6.100

dhcp server forbidden-ip 192.168.7.100

#

vlan 5 to 7

#

dhcp server ip-pool 5

gateway-list 192.168.5.254

network 192.168.5.0 mask 255.255.255.0

dns-list 192.168.5.100

#

dhcp server ip-pool 6

gateway-list 192.168.6.254

network 192.168.6.0 mask 255.255.255.0

dns-list 192.168.6.100

#

dhcp server ip-pool 7

gateway-list 192.168.7.254

network 192.168.7.0 mask 255.255.255.0

dns-list 192.168.7.100

#

interface Vlan-interface5

4

ip address 192.168.5.254 255.255.255.0

#

interface Vlan-interface6

ip address 192.168.6.254 255.255.255.0

#

interface Vlan-interface7

ip address 192.168.7.254 255.255.255.0

#

interface GigabitEthernet1/0/5

port link-mode bridge

port access vlan 5

#

interface GigabitEthernet1/0/6

port link-mode bridge

port access vlan 6

#

interface GigabitEthernet1/0/7

port link-mode bridge

port access vlan 7

#

Related documentation

•

DHCP configuration in the Layer 3 IP services configuration guide for the device.

•

DHCP commands in the Layer 3 IP services command reference for the device.

5

Configuring DHCP relay agent

Introduction

The following example describes the basic procedure to configure an interface as a DHCP relay

agent. The DHCP relay agent enables clients to obtain IP addresses and configuration parameters

from a DHCP server on another subnet.

Network configuration

As shown in Figure 2, Switch Aacts as the core switch and has two VLANs. Host Aand Host B are in

VLAN 5 and VLAN 6, respectively. The DHCP server and the hosts run on different subnets and

Switch A is the gateway for these hosts. Configure the network to meet the following requirements:

•

The DHCP clients run on subnets 192.168.5.0/24 and 192.168.6.0/24, and the DHCP server IP

address is 192.168.7.100/24.

•

Switch A acts as the DHCP relay agent for clients, so these clients can obtain IP addresses in

subnets 192.168.5.0/24 and 192.168.6.0/24, and other network settings from the DHCP server.

Figure 2 Network diagram

Procedure

1. Configure Switch B.

# Create VLAN 5 and VLAN 6, and then assign GigabitEthernet 1/0/2 and GigabitEthernet 1/0/3

to VLAN 5 and VLAN 6, respectively.

<SwitchB> system-view

[SwitchB] vlan 5

[SwitchB-vlan5] port gigabitEthernet 1/0/2

[SwitchB-vlan5] quit

[SwitchB] vlan 6

GE1/0/1

Switch B

GE1/0/2 GE1/0/3

DHCP server

Switch A

GE1/0/1

GE1/0/2

VLAN 5

Host A VLAN 6

Host B

6

[SwitchB-vlan6] port gigabitEthernet 1/0/3

[SwitchB-vlan6] quit

# Configure GigabitEthernet 1/0/1 as a trunk port, and allow packets from all VLANs to pass

through the trunk port.

[SwitchB] interface gigabitEthernet 1/0/1

[SwitchB-GigabitEthernet1/0/1] port link-type trunk

[SwitchB-GigabitEthernet1/0/1] port trunk permit vlan all

[SwitchB-GigabitEthernet1/0/1] quit

2. Configure Switch A.

# Enable DHCP.

<SwitchA> system-view

[SwitchA] dhcp enable

# Create VLAN 5, VLAN 6, and VLAN 7, and then assign GigabitEthernet 1/0/2 to VLAN 7.

[SwitchA] vlan 5 to 7

[SwitchA] interface GigabitEthernet 1/0/2

[SwitchA-GigabitEthernet1/0/2] port access vlan 7

[SwitchA-GigabitEthernet1/0/2] quit

# Configure GigabitEthernet 1/0/1 as a trunk port, and allow packets from all VLANs to pass

through the trunk port.

[SwitchA] interface gigabitEthernet 1/0/1

[SwitchA-GigabitEthernet1/0/1] port link-type trunk

[SwitchA-GigabitEthernet1/0/1] port trunk permit vlan all

[SwitchA-GigabitEthernet1/0/1] quit

# Assign an IP address to VLAN 5, VLAN 6, and VLAN 7, respectively.

[SwitchA] interface vlan-interface 5

[SwitchA-Vlan-interface5] ip address 192.168.5.1 255.255.255.0

[SwitchA-Vlan-interface5] quit

[SwitchA] interface vlan-interface 6

[SwitchA-Vlan-interface6] ip address 192.168.6.1 255.255.255.0

[SwitchA-Vlan-interface6] quit

[SwitchA]interface vlan-interface 7

[SwitchA-Vlan-interface7] ip address 192.168.7.1 255.255.255.0

[SwitchA-Vlan-interface7] quit

# Enable the DHCP relay agent mode on VLAN-interface 5.

[SwitchA] interface vlan-interface 5

[SwitchA-Vlan-interface5] dhcp select relay

# Assign IP address 192.168.7.100 to the DHCP server.

[SwitchA-Vlan-interface5] dhcp relay server-address 192.168.7.100

# Enable the DHCP relay agent mode on VLAN-interface 6.

[SwitchA] interface vlan-interface 6

[SwitchA-Vlan-interface6] dhcp select relay

# Assign IP address 192.168.7.100 to the DHCP server.

[SwitchA-Vlan-interface6] dhcp relay server-address 192.168.7.100

3. Configure DHCP server. Details are not shown.

# Assign IP address 192.168.7.100/24 to the NIC of the DHCP server.

# Configure IP address 192.168.7.1 as the gateway for the DHCP server.

# Make sure the DHCP server can ping 192.168.5.1 and 192.168.6.1.

7

Verifying the configuration

Check whether Host A and Host B can obtain IP addresses and other network settings from the

DHCP server.

Configuration files

•

Switch B:

#

vlan 5 to 6

#

interface GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

port trunk permit vlan all

#

interface GigabitEthernet1/0/2

port link-mode bridge

port access vlan 5

#

interface GigabitEthernet1/0/3

port link-mode bridge

port access vlan 6

•

Switch A:

#

dhcp enable

#

vlan 5 to 7

#

interface Vlan-interface5

ip address 192.168.5.1 255.255.255.0

dhcp select relay

dhcp relay server-address 192.168.7.100

#

interface Vlan-interface6

ip address 192.168.6.1 255.255.255.0

dhcp select relay

dhcp relay server-address 192.168.7.100

#

interface Vlan-interface7

ip address 192.168.7.1 255.255.255.0

#

interface Ten-GigabitEthernet1/0/1

port link-mode bridge

port link-type trunk

port trunk permit vlan all

#

8

interface Ten-GigabitEthernet1/0/2

port link-mode bridge

port access vlan 7

#

H3C DHCP Manuale utente

Manuali Hardware di rete popolari di altre marche