DHCP Server Instance
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18.2.3 Troubleshooting DHCP Configuration
1. The DHCP Server is disabled by default. Use the following command to enable the
DHCP Server:
RFSwitch(config)#service dhcp
This command administratively enables the DHCP server. If the DHCP configuration is
incomplete, it is possible the DHCP server will be disabled even after the execution of
this command.
2. Use the
network command to map the network pool to interface.
network 192.168.0.0/24
In the above example, 192.168.0.0/24 represents the L3 interface. When you execute
this command, no check is performed to endorse whether an interface (with the
specified IP/Netmask) exists. The verification is not performed because you can create
a pool and map it to non existing L3 interface.
When you add a L3 interface and assign an IP address to it, the DHCP server gets
enabled/started on this interface. If you have a pool for network 192.168.0.0/24, but
the L3 interface is 192.168.0.0/16, DHCP is not enabled on 192.168.0.0/16, since it is
different from 192.168.0.0/24.
3. A network pool without any include range is as good as not having a pool. Add a
include range using the
address range command.
address range 192.168.0.30 192.168.0.30
4. To work properly, a host pool should have the following 3 items configured:
• client-name (CLI is
client-name <name>)
• fixed-address CLI is
host <ip>)
• hardware-address/client-identifier
The hardware address is
hardware-address <addr>
The client-identifier is client-identifier <id>
If you use client-identifier instead of hardware-address, a DHCP client
sends the client-identifier when it requests for IP address. The Client - identifier has to
be configured in the DHCP Client as an ASCII value and the same has to be used in the
DHCP server option (for example, the Client- identifier option).
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