R0106-HP MSR Router Series Layer 3 - IP Services Configuration Guide(V7)

Figure 28 Network diagram

Configuration procedure

# Enable DHCP snooping.

<RouterB> system-view

[RouterB] dhcp snooping enable

# Configure GigabitEthernet 2/1/1 as a trusted port.

[RouterB] interface gigabitethernet 2/1/1

[RouterB-GigabitEthernet2/1/1] dhcp snooping trust

[RouterB-GigabitEthernet2/1/1] quit

# Enable DHCP snooping to record clients' IP-to-MAC bindings on GigabitEthernet 2/1/2.

[RouterB] interface gigabitethernet 2/1/2

[RouterB-GigabitEthernet2/1/2] dhcp snooping binding record

[RouterB-GigabitEthernet2/1/2] quit

Verifying the configuration

The DHCP client can obtain an IP address and other configuration parameters only from the authorized

DHCP server. You can display the DHCP snooping entry recorded for the client with the display dhcp

snooping binding command.

Option 82 configuration example

Network requirements

As shown in Figure 29, enable DHCP snooping and configure Option 82 on Router B as follows:

• Configure the handling strategy for DHCP requests that contain Option 82 as replace.

• On GigabitEthernet 2/1/2, configure the padding content for the Circuit ID sub-option as

company001 and for the Remote ID sub-option as device001.

• On GigabitEthernet 2/1/3, configure the padding format for the Circuit ID sub-option as verbose,

access node identifier as sysname, and code type as ascii, and configure the padding content for

the Remote ID sub-option as device001.