3com S7906E Manuel De Montage

 

 

5-5 

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You need to specify the ports connected to the authorized DHCP servers as trusted to ensure that 

DHCP clients can obtain valid IP addresses. The trusted port and the port connected to the DHCP 

client must be in the same VLAN. 

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Currently, you can specify Layer 2 Ethernet interfaces and Layer 2 aggregate interfaces as trusted 

ports. For details about aggregate interfaces, refer to Link Aggregation Configuration in the Access 

Volume. 

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If a Layer 2 Ethernet interface is added to an aggregation group, the DHCP snooping configuration 

of the interface will not take effect. After the interface quits the aggregation group, the configuration 

will be effective. 

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Configuring both the DHCP snooping and selective QinQ function on the switch is not 

recommended because it may result in malfunction of DHCP snooping. 

 

You need to enable the DHCP snooping function before configuring DHCP snooping to support Option 

82. 

Follow these steps to configure DHCP snooping to support Option 82: 

Enter system view 

— 

Enter interface view 

interface interface-type 
interface-number 

— 

Enable DHCP snooping to support 
Option 82 

Required 

Disabled by default.

Configure the handling strategy for 
requesting messages containing 
Option 82 

dhcp-snooping information 
strategy { drop | keep | replace } 

Optional 

replace by default.