5-7z You can enable DHCP snooping to support Option 82 on Layer 2 Ethernet interfaces,ONU portand Layer 2 aggregation interfaces only.z If a Layer 2 Ethernet interface is added to an aggregation group, enabling DHCP snooping tosupport Option 82 on the interface will not take effect. After the interface quits the aggregationgroup, the configuration will be effective.z To support Option 82, it is required to perform related configuration on both the DHCP server andthe device enabled with DHCP snooping. Refer to Configuring the Handling Mode for Option 82 forDHCP server configuration of this kind.z If the handling strategy of the DHCP-snooping-enabled device is configured as replace, you needto configure a padding format for Option 82. If the handling strategy is keep or drop, you need notconfigure any padding format.z If the Option 82 is padded with the device name (sysname) of a node, the device name mustcontain no spaces. Otherwise, the DHCP-snooping-enabled device will drop the message.Displaying and Maintaining DHCP SnoopingTo do… Use the command… RemarksDisplay DHCP snooping entries display dhcp-snooping [ ipip-address ] Available in any viewDisplay Option 82 configurationinformation on the DHCP snoopingdevicedisplay dhcp-snoopinginformation { all | interfaceinterface-type interface-number }Available in any viewDisplay DHCP packet statistics on theDHCP snooping device (for distributeddevices)display dhcp-snooping packetstatistics [ slot slot-number ] Available in any viewDisplay DHCP packet statistics on theDHCP snooping device (for distributedIRF devices)display dhcp-snooping packetstatistics [ chassischassis-number slotslot-number ]Available in any viewDisplay information about trusted ports display dhcp-snooping trust Available in any viewClear DHCP snooping entries reset dhcp-snooping { all | ipip-address } Available in user viewClear DHCP packet statistics on theDHCP snooping device (for distributeddevices)reset dhcp-snooping packetstatistics [ slot slot-number ] Available in user viewClear DHCP packet statistics on theDHCP snooping device (for distributedIRF devices)reset dhcp-snooping packetstatistics [ chassischassis-number slotslot-number ]Available in user view
