R2511-HP MSR Router Series Layer 3 - IP Services Configuration Guide(V5)

<SwitchB> system-view

[SwitchB] dhcp-snooping

# Specify Ethernet 1/1 as trusted.

[SwitchB] interface ethernet 1/1

[SwitchB-Ethernet1/1] dhcp-snooping trust

[SwitchB-Ethernet1/1] quit

DHCP snooping Option 82 support configuration

example

Network requirements

As shown in Figure 32, Switch B replaces Option 82 in DHCP requests before forwarding them to the

DHCP server (Switch A).

• The Circuit ID sub-option is company001.

• The Remote ID sub-option is device001.

• On Ethernet 1/3, configure the padding format as verbose, access node identifier as sysname,

and code type as ascii for Option 82.

Configuration procedure

# Enable DHCP snooping.

<SwitchB> system-view

[SwitchB] dhcp-snooping

# Specify Ethernet 1/1 as trusted.

[SwitchB] interface ethernet 1/1

[SwitchB-Ethernet1/1] dhcp-snooping trust

[SwitchB-Ethernet1/1] quit

# Configure Ethernet 1/2 to support Option 82.

[SwitchB] interface ethernet 1/2

[SwitchB-Ethernet1/2] dhcp-snooping information enable

[SwitchB-Ethernet1/2] dhcp-snooping information strategy replace

[SwitchB-Ethernet1/2] dhcp-snooping information circuit-id string company001

[SwitchB-Ethernet1/2] dhcp-snooping information remote-id string device001

[SwitchB-Ethernet1/2] quit

# Configure Ethernet 1/3 to support Option 82.

[SwitchB] interface ethernet 1/3

[SwitchB-Ethernet1/3] dhcp-snooping information enable

[SwitchB-Ethernet1/3] dhcp-snooping information strategy replace

[SwitchB-Ethernet1/3] dhcp-snooping information format verbose node-identifier sysname

[SwitchB-Ethernet1/3] dhcp-snooping information circuit-id format-type ascii

[SwitchB-Ethernet1/3] dhcp-snooping information remote-id format-type ascii