3Com S7906E - Switch, Configuration Manual

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DHCP Server Configuration
When configuring the DHCP server, go to these sections for information you are interested in:
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Introduction to DHCP Server
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DHCP Server Configuration Task List
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Configuring an Address Pool for the DHCP Server
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Enabling DHCP
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Enabling the DHCP Server on an Interface
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Applying an Extended Address Pool on an Interface
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Configuring the DHCP Server Security Functions
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Configuring the Handling Mode for Option 82
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Displaying and Maintaining the DHCP Server
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DHCP Server Configuration Examples
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Troubleshooting DHCP Server Configuration
The DHCP server configuration is supported only on VLAN interfaces, and loopback interfaces. The
secondary IP address pool configuration is not supported on loopback interfaces.
Introduction to DHCP Server
Application Environment
The DHCP server is well suited to the network where:
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It is hard to implement manual configuration and centralized management.
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The hosts are more than the assignable IP addresses and it is impossible to assign a fixed IP
address to each host. For example, an ISP limits the number of hosts accessing the Internet at a
time, so lots of hosts need to acquire IP addresses dynamically.
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A few hosts need fixed IP addresses.
In addition to assigning IP addresses to DHCP clients on public networks, a multi-VPN-instance
customer edge (MCE) device serving as the DHCP server can also assign IP addresses to DHCP
clients on private networks. Note that the IP address ranges of public and private networks or those of
private networks on the DHCP server cannot overlap each other. For details about MCE, refer to MPLS
L3VPN Configuration in the MPLS Volume .