Example: Configuring DHCP snooping support for Option 82

Network configuration

As shown in Figure 35, enable DHCP snooping and configure Option 82 on Switch B as follows:

Figure 35: Network diagram

Procedure


[IMPORTANT: ]

IMPORTANT:

By default, interfaces on the device are disabled (in ADM or Administratively Down state). To have an interface operate, you must use the undo shutdown command to enable that interface.


# Enable DHCP snooping.

<SwitchB> system-view
[SwitchB] dhcp snooping enable

# Configure Ten-GigabitEthernet 1/0/1 as a trusted port.

[SwitchB] interface ten-gigabitethernet 1/0/1
[SwitchB-Ten-GigabitEthernet1/0/1] dhcp snooping trust
[SwitchB-Ten-GigabitEthernet1/0/1] quit

# Configure Option 82 on Ten-GigabitEthernet 1/0/2.

[SwitchB] interface ten-gigabitethernet 1/0/2
[SwitchB-Ten-GigabitEthernet1/0/2] dhcp snooping information enable
[SwitchB-Ten-GigabitEthernet1/0/2] dhcp snooping information strategy replace
[SwitchB-Ten-GigabitEthernet1/0/2] dhcp snooping information circuit-id string company001
[SwitchB-Ten-GigabitEthernet1/0/2] dhcp snooping information remote-id string device001
[SwitchB-Ten-GigabitEthernet1/0/2] quit

# Configure Option 82 on Ten-GigabitEthernet 1/0/3.

[SwitchB] interface ten-gigabitethernet 1/0/3
[SwitchB-Ten-GigabitEthernet1/0/3] dhcp snooping information enable
[SwitchB-Ten-GigabitEthernet1/0/3] dhcp snooping information strategy replace
[SwitchB-Ten-GigabitEthernet1/0/3] dhcp snooping information circuit-id verbose node-identifier sysname format ascii
[SwitchB-Ten-GigabitEthernet1/0/3] dhcp snooping information remote-id string device001

Verifying the configuration

# Display Option 82 configuration information on Ten-GigabitEthernet 1/0/2 and Ten-GigabitEthernet 1/0/3 on the DHCP snooping device.

[SwitchB] display dhcp snooping information