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Dhcp overview, Dhcp address allocation, Allocation mechanisms – H3C Technologies H3C S12500-X Series Switches User Manual

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DHCP overview

The Dynamic Host Configuration Protocol (DHCP) provides a framework to assign configuration

information to network devices.

Figure 9

shows a typical DHCP application scenario where the DHCP clients and the DHCP server reside

on the same subnet. The DHCP clients can also obtain configuration parameters from a DHCP server on

another subnet through a DHCP relay agent. For more information about the DHCP relay agent, see

"

Configuring the DHCP relay agent

."

Figure 9 A typical DHCP application

DHCP address allocation

Allocation mechanisms

DHCP supports the following allocation mechanisms:

Static allocation—The network administrator assigns an IP address to a client, such as a WWW

server, and DHCP conveys the assigned address to the client.

Automatic allocation—DHCP assigns a permanent IP address to a client.

Dynamic allocation—DHCP assigns an IP address to a client for a limited period of time, which is
called a lease. Most DHCP clients obtain their addresses in this way.

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