Configuring Dhcp Snooping To Support Option - H3C S5100-SI Series Operation Manual

Operation Manual – DHCP
H3C S5100-SI/EI Series Ethernet Switches
Specify the current port as
a trusted port
Note:
If an S5100-SI/EI Ethernet switch is enabled with DHCP snooping, the clients
connected to it cannot dynamically obtain IP addresses through BOOTP.
You need to specify the ports connected to the valid 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.
You are not recommended to configure both the DHCP snooping and selective
Q-in-Q function on the switch, which may result in the DHCP snooping to function
abnormally.

2.2.2 Configuring DHCP Snooping to Support Option 82

Note:
Enable DHCP snooping and specify trusted ports on the switch before configuring
DHCP snooping to support Option 82.
Complete the following tasks to configure the DHCP snooping to support Option 82:
Enabling DHCP-snooping Option 82 support
Configuring a handling policy for DHCP packets with Option 82
Configuring the storage format of Option 82
Configuring the circuit ID sub-option
Configuring the remote ID sub-option
Configuring the padding format for Option 82
To do...
dhcp-snooping trust
Task
Chapter 2 DHCP Snooping Configuration
Use the command...
2-7
Remarks
Required
By default, after DHCP
snooping is enabled, all
ports of a switch are
untrusted ports.
Remarks
Required
Optional
Optional
Optional
Optional
Optional