Configuring Dhcp Snooping To Support Option 82 - H3C S5600 Series Operation Manual

Operation Manual – DHCP
H3C S5600 Series Ethernet Switches
Note:
If an S5600 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.
To enable DHCP snooping on an S5600 switch that belongs to an IRF fabric, set the
fabric ports on all devices in the fabric to DHCP snooping trusted ports to ensure
that the clients connected to each device can obtain IP addresses. In this case, do
not configure the ports connecting to the DHCP clients and DHCP server to belong
to different units of the fabric; otherwise, the switch cannot record DHCP snooping
entries although the clients can obtain IP addresses.
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.

4.2.2 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
I. Enabling DHCP-snooping Option 82 support
Follow these steps to enable DHCP-snooping Option 82 support:
Chapter 4 DHCP Snooping Configuration
Task
4-7
Remarks
Required
Optional
Optional
Optional
Optional
Optional