3com 5500-ei pwr Instruccion De Instalación

 

3-7 

Currently, the DHCP relay agent handshake function on an S5500-EI series switch can only 

interoperate with a Windows 2000 DHCP server. 

 

If there is an unauthorized DHCP server in the network, when a client applies for an IP address, the 

unauthorized DHCP server may assign an incorrect IP address to the DHCP client.  

With this feature enabled, upon receiving a DHCP message with the siaddr field (IP addresses of the 

servers offering IP addresses to the client) not being 0 from a client, the DHCP relay agent will record 

the value of the siaddr field and the receiving interface. The administrator can use this information to 

check out any DHCP unauthorized servers. 

Follow these steps to enable unauthorized DHCP server detection: 

Enter system view 

— 

Enable unauthorized DHCP 
server detection  

Required 

Disabled by default. 

 

With the unauthorized DHCP server detection enabled, the relay agent will log all DHCP servers, 

including authorized ones, and each server is recorded only once until such information is removed and 

is recorded again. The administrator needs to find unauthorized DHCP servers from the system log 

information.  

 

Before configuring Option 82 support on a DHCP relay agent, you need to: 

z 

Configure network parameters and relay function of the DHCP relay device. 

z 

Perform assignment strategy-related configurations, such as network parameters of the DHCP 

server, address pool, and lease time. 

z 

The routes between the DHCP relay agent and the DHCP server are reachable. 

Follow these steps to enable Option 82 support on a DHCP relay agent: 

Enter system view 

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