Dhcp Packet Processing Modes; Protocols And Standards - H3C S7500 Series Operation Manual

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Operation Manual – DHCP

H3C S7500 Series Ethernet Switches

1.4 DHCP Packet Processing Modes

After the DHCP server is enabled on a device, the device processes the DHCP packet

received from a DHCP client in one of the following three modes depending on your

configuration:

Global address pool: In response to the DHCP packets received from DHCP

clients, the DHCP server picks IP addresses from its global address pools and

assigns them to the DHCP clients.

Interface address pool: In response to the DHCP packets received from DHCP

clients, the DHCP server picks IP addresses from the interface address pools

and assigns them to the DHCP clients. If there is no available IP address in the

interface address pools, the DHCP server picks IP addresses from its global

address pool that contains the interface address pool segment and assigns them

to the DHCP clients.

Trunk: DHCP packets received from DHCP clients are forwarded to an external

DHCP server, which assigns IP addresses to the DHCP clients.

You can specify the mode to process DHCP packets. For the configuration of the first

two modes, see

DHCP Relay Agent

One interface only corresponds to one mode. In this case, the new configuration

overwrites the previous one.

Protocol specifications related to DHCP include:

RFC2131: Dynamic Host Configuration Protocol

RFC2132: DHCP Options and BOOTP Vendor Extensions

RFC1542: Clarifications and Extensions for the Bootstrap Protocol

Configuration. For the configuration of the trunk mode,

Configuration.

Chapter 1 DHCP Overview

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