Huawei Quidway S5600 Series Operation Manual page 658

Operation Manual - DHCP
Quidway S5600 Series Ethernet Switches-Release 1510
Note:
For the configurations specifying to add sub-option 2, sub-option 3, and sub-option 4
in the response packets to take effect, you must configure the DHCP server to add
sub-option 1.
III. Mechanism of using option 184 on DHCP server
The DHCP server encapsulates the information for option 184 to carry in the response
packets sent to the DHCP clients. Supposing that the DHCP clients are on the same
segment as the DHCP server, the mechanism of option 184 support on DHCP server
is as follows:
1) A DHCP client sends to the DHCP server a request packet carrying option 55,
which indicates the client requests the configuration parameters of option 184.
2) The DHCP server checks the request list in option 55 carried by the request
packet, and then adds the sub-options of option 184 in the Options field of the
response packet sent to the DHCP client.
Note:
Only when the DHCP client specifies in option 55 of the request packet that it requires
option 184, does the DHCP server add option 184 in the response packet sent to the
client.
2.6.2 Prerequisites
The following are required before you configuring the option 184 supporting function.
The network parameters, address pools, and lease time are configured.
The DHCP server and the DHCP clients can communicate properly with each
other.
Before configuring option 184, you must configure an IP address for the interface
on which option 184 is to be enabled.
2.6.3 Configuring the Option 184 Supporting Function
You can configure the sub-options of option 184 in system view, interface view, and
DHCP global address pool view. Note that an interface-based address pool is needed
for the first two methods.
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Chapter 2 DHCP Server Configuration