3Com 5500-SI Manual

A SERVICE OF

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DHCP Configuration 291

Figure 71 Interaction between a DHCP client and a DHCP server.

■ DHCP snooping listens the following two types of packets to retrieve the IP

addresses the DHCP clients obtain from DHCP servers and the MAC addresses of

the DHCP clients:

■ DHCP-ACK packet

■ DHCP-REQUEST packet

DHCP Snooping

Configuration

Table 288 shows the configuration specifications for DHCP snooping.

Table 288 Configure the DHCP snooping function

Operation Command Description

Enter system view system-view -

Enable the DHCP snooping

function

dhcp-snooping Required

By default, the DHCP snooping

function is disabled.

Enter Ethernet port view interface

interface-type

interface-number

-

Set the port connected to a

DHCP server to a trusted port

dhcp-snooping trust Optional

By default, all ports of a switch are

untrusted ports.