3com S7906E Manuel De Montage

 

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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. 

When Option 55 in the client’s request contains parameters of Option 66, Option 67, or Option 150, the 

DHCP server will return the IP address or name of the specified TFTP server, and bootfile name to the 

client. 

Follow these steps to configure the IP address and name of the TFTP server and the bootfile name in 

the DHCP address pool: 

Enter system view 

— 

Enter DHCP address pool view 

dhcp server ip-pool pool-name 
[ extended ] 

— 

Specify the TFTP server 

tftp-server ip-address ip-address 

Specify the name of the TFTP 
server 

tftp-server domain-name 
domain-name 

Required to use either 
command 

Not specified by default. 

Specify the bootfile name 

bootfile-name bootfile-name 

Required 

Not specified by default. 

 

By configuring self-defined DHCP options, you can 

z 

Define new DHCP options. New configuration options will come out with DHCP development. To 

support these new options, you can add them into the attribute list of the DHCP server. 

z 

Define existing DHCP options. Some options have no unified definitions in RFC 2132; however, 

vendors can define such options as Option 43 as needed. The self-defined DHCP option enables 

DHCP clients to obtain vendor-specific information. 

z 

Extend existing DHCP options. When the current DHCP options cannot meet the customers’ 

requirements (for example, you cannot use the dns-list command to configure more than eight 

DNS server addresses), you can configure a self-defined option for extension. 

Follow these steps to configure a self-defined DHCP option in the DHCP address pool: 

Enter system view 

— 

Enter DHCP address pool view 

dhcp server ip-pool 
pool-name [ extended ] 

— 

Configure a self-defined DHCP 
option 

option code { ascii ascii-string 
| hex hex-string&<1-16> | 
ip-address ip-address&<1-8> }

Required 

No DHCP option is configured 
by default.