Dhcp Server Configuration Task List; Enabling Dhcp - 3Com E4500-24 Cli Configuration Manual

When you merge two or more XRN systems into one XRN system, a new master unit is elected,
and the new XRN system adopts new configurations accordingly. This may result in the existing
system configurations (including the address pools configured for the DHCP servers) being lost. As
the new XRN system cannot inherit the original DHCP server configurations, you need to perform
DHCP server configurations for it.
When an XRN system is split into multiple new XRN systems, some of the new XRN systems may
be degraded to Layer 2 devices. For a new XRN system degraded to Layer 2 device, although the
original DHCP server still exists in the new system, it runs idle for being unable to receive any
packets. When the XRN system restores to a Layer 3 device due to being merged into a new XRN
system, it adopts the configurations on the new XRN system. And you need to perform DHCP
server configurations if the new XRN system does not have DHCP server-related configurations.
In an XRN system, the UDP HELPER function must be enabled on the DHCP servers that are in
fabric state.

DHCP Server Configuration Task List

Complete the following tasks to configure the DHCP server:

Enabling DHCP

Configure address
pool based DHCP
server
Configuring DHCP Server Security Functions
Configuring DHCP Accounting Functions
Enabling the DHCP Server to Process Option 82
Enabling DHCP
You need to enable DHCP to make other related configurations take effect.
Follow these steps to enable DHCP:
To do...
Enter system view
Enable DHCP
Task
Configuring the Global Address Pool Based
DHCP Server
Configuring the Interface Address Pool Based
DHCP Server
Use the command...
system-view
dhcp enable
2-4
Remarks
Required
One of the two options is
required
Optional
Optional
Optional
Remarks
—
Optional
By default, DHCP is enabled.