H3C S5600 Series Operation Manual page 686

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 on the 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 to be sent to the DHCP
client.
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.
Configuring Option 184 Parameters for the DHCP Client with Voice Service
Follow these steps to configure Option 184 parameters for the DHCP client with voice service:
To do...
Enter system view
Enter DHCP address pool view
Specify the IP address of the
primary network calling processor
Specify the IP address of the
backup network calling processor
Configure the voice VLAN
Specify the failover IP address
Specify an IP address for the network calling processor before performing other configuration.
Configuring the TFTP Server and Bootfile Name for the DHCP Client
This task is to specify the IP address and name of a TFTP server and the bootfile name in the DHCP
global address pool. The DHCP clients use these parameters to contact the TFTP server, requesting
the configuration file used for system initialization, which is called auto-configuration. The request
process of the client is described below:
Use the command...
system-view
dhcp server ip-pool pool-name
voice-config ncp-ip ip-address
voice-config as-ip ip-address
voice-config voice-vlan vlan-id
{ disable | enable }
voice-config fail-over ip-address
dialer-string
2-13
Remarks
—
—
Required
Not specified by default.
Optional
Not specified by default.
Optional
Not configured by default.
Optional
No failover IP address is specified
by default.