3com 5500-ei pwr Instrução De Instalação

 

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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: 

1)  When a switch starts up without loading any configuration file, the system sets the specified 

interface (VLAN-interface 1) as the DHCP client to request from the DHCP server parameters such 

as the IP address and name of a TFTP server, and 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 

related parameters, it will perform system initialization without loading any configuration file. 

To implement auto-configuration, you need to specify the IP address and name of a TFTP server and 

the bootfile name on the DHCP server, but you do not need to perform any configuration on the DHCP 

client. 

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

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

address to the client, which uses such information to complete auto-configuration. 

Follow these steps to configure the TFTP server and bootfile name for the DHCP client: 

Enter system view 

— 

Enter DHCP address pool 
view 

dhcp server ip-pool pool-name 

— 

Specify the TFTP server 

tftp-server ip-address ip-address 

Optional 

Not specified by default. 

Specify the name of the 
TFTP server 

tftp-server domain-name 
domain-name 

Optional 

Not specified by default. 

Specify the bootfile name 

bootfile-name bootfile-name 

Optional 

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

z 

Extend existing DHCP options. When the current DHCP options cannot meet 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: 

Enter system view 

— 

Enter DHCP address pool view  dhcp server ip-pool pool-name 

—