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102

Figure 37 Network diagram

Configuration procedure

# Enable DHCP snooping.

<SwitchB> system-view

[SwitchB] dhcp snooping enable

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

[SwitchB] interface gigabitethernet 1/0/1

[SwitchB-GigabitEthernet1/0/1] dhcp snooping trust

[SwitchB-GigabitEthernet1/0/1] quit

# Enable DHCP snooping to record clients' IP-to-MAC bindings on GigabitEthernet 1/0/2.

[SwitchB] interface gigabitethernet 1/0/2

[SwitchB-GigabitEthernet1/0/2] dhcp snooping binding record

[SwitchB-GigabitEthernet1/0/2] quit

Verifying the configuration

# Verify that the DHCP client can obtain an IP address and other configuration parameters only from

the authorized DHCP server. (Details not shown.)

# Display the DHCP snooping entry recorded for the client.

[SwitchB] display dhcp snooping binding

Option 82 configuration example

Network requirements

As shown in Figure 38, enable DHCP snooping and configure Option 82 on Switch B as follows:

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

• On GigabitEthernet 1/0/2, configure the padding content for the Circuit ID sub-option as

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

• On GigabitEthernet 1/0/3, configure the padding mode for the Circuit ID sub-option as verbose,

access node identifier as sysname, and padding format as ascii. Configure the padding

content for the Remote ID sub-option as device001.

HPE FlexNetwork MSR Series Comware 7 Layer 3 - Ip Services Configuration Guides

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