H3C Technologies H3C S7500E Series Switches - Manual (Page 54)

5-11
If Option 55 in the request from a DHCP client contains Option 184, the DHCP server will return
parameters specified in Option 184 to the client. The client then can initiate a call using parameters in
Option 184.
Follow these steps to configure option 184 parameters in the DHCP address pool:
To do… Use the command… Remarks
Enter system view system-view —
Enter DHCP address pool view
dhcp server ip-pool
pool-name [ extended ]
—
Specify the IP address of the primary
network calling processor
voice-config ncp-ip
ip-address
Required
Not specified by default.
Specify the IP address of the backup
network calling processor
voice-config as-ip ip-address
Optional
Not specified by default.
Configure the voice VLAN
voice-config voice-vlan
vlan-id { disable | enable }
Optional
Not configured by default.
Specify the failover IP address and
dialer string
voice-config fail-over
ip-address dialer-string
Optional
No failover IP address or dialer
string is specified by default.
Specify an IP address for the network calling processor before performing other configurations.
Configuring the TFTP Server and Bootfile Name for the Client
This task is to specify the IP address and name of a TFTP server and the bootfile name in the DHCP
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:
1) When a router starts up without loading any configuration file, the system sets an active interface
(such as the interface of the default VLAN or a Layer 3 Ethernet interface) as the DHCP client to
request from the DHCP server for parameters, such as an IP address and name of a TFTP server,
and the bootfile name.
2) After getting related parameters, the DHCP client will send a TFTP request to obtain the
configuration file from the specified TFTP server for system initialization. If the client cannot get
such parameters, it will perform system initialization without loading any configuration file.
To implement auto-configuration, you need to specify the IP address or name of a TFTP server and the
bootfile name in the DHCP address pool on the DHCP server, but you do not need to perform any
configuration on the DHCP client.