4-9z If you configure a remote ID sub-option in both system view and on a port, the remote ID sub-optionconfigured on the port applies when the port receives a packet, and the global remote ID applies toother interfaces that have no remote ID sub-option configured.z If you have configured a remote ID with the vlan vlan-id argument specified, and the other onewithout the argument in Ethernet port view, the former remote ID applies to the DHCP messagesfrom the specified VLAN, while the latter one applies to DHCP messages from other VLANs.z In a port aggregation group, you can use this command to configure the primary and member portsrespectively. When Option 82 is added, however, the remote ID is subject to the one configured onthe primary port.z The remote ID configured on a port will neither be synchronized in the case of port aggregation norsupport XRN.Configuring the padding format for Option 82Follow these steps to configure the padding format for Option 82:To do… Use the command… RemarksEnter system view system-view —Configure the paddingformatdhcp-snooping informationpacket-format { extended |standard }OptionalBy default, the padding format isin extended format.Configuring IP FilteringFollow these steps to configure IP filtering:To do… Use the command… RemarksEnter system view system-view —Enter Ethernet port view interface interface-typeinterface-number —Create a static bindingip source static bindingip-address ip-address[ mac-address mac-address ]OptionalBy default, no IPstatic binding entryis created.Enable IP filteringbased on theDHCP-snooping tableand the IP staticbinding tableip check source ip-address[ mac-address ]Enable IPfilteringEnable IP filteringbased onauthenticated 802.1xclientsip check dot1x enableEither command isrequiredBy default, thisfunction is disabled.
