3com 5500-ei pwr Guía De Referencia

 

3-7 

# Configure the remote ID of Option 82 in DHCP packets to abc on the port Ethernet 1/0/1. 

<Sysname> system-view 

System View: return to User View with Ctrl+Z. 

[Sysname] interface Ethernet1/0/1 

[Sysname-Ethernet1/0/1] dhcp-snooping information remote-id string abc 

undo dhcp-snooping trust 

Ethernet port view 

None 

Use the dhcp-snooping trust command to set an Ethernet port to a DHCP-snooping trusted port. 

Use the undo dhcp-snooping trust command to restore an Ethernet port to a DHCP-snooping 

untrusted port. 

By default, with the DHCP snooping enabled, all the ports of a switch are untrusted ports. 

Note that: 

After DHCP snooping is enabled, you need to specify the port connected to a valid DHCP server as 

trusted to ensure that DHCP clients can obtain valid IP addresses. The trusted port and the ports 

connected to DHCP clients must be in the same VLAN. 

Related commands: display dhcp-snooping trust. 

# Enter system view. 

<Sysname> system-view 

System View: return to User View with Ctrl+Z. 

# Set the Ethernet 1/0/1 port to a trusted port. 

[Sysname] interface Ethernet1/0/1 

[Sysname-Ethernet1/0/1] dhcp-snooping trust 

display dhcp-snooping [ unit unit-id ] 

Any view