4-4Handling policy Sub-option configuration The DHCP Snooping devicewill…Neither of the two sub-options isconfiguredForward the packet after replacingthe original Option 82 with thedefault content.The storage format of Option 82content is the one specified withthe dhcp-snooping informationformat command or the defaultHEX format if this command is notexecuted.Circuit ID sub-option is configuredForward the packet after replacingthe circuit ID sub-option of theoriginal Option 82 with theconfigured circuit ID sub-option inASCII format.ReplaceRemote ID sub-option isconfiguredForward the packet after replacingthe remote ID sub-option of theoriginal Option 82 with theconfigured remote ID sub-option inASCII format.When receiving a DHCP client’s request without Option 82, the DHCP snooping device will add theoption field with the configured sub-option and then forward the packet. For details, see Table 4-2.Table 4-2 Ways of handling a DHCP packet without Option 82Sub-option configuration The DHCP-Snooping device will …Neither of the two sub-options is configured.Forward the packet after adding Option 82 with thedefault contents.The format of Option 82 is the one specified with thedhcp-snooping information format command or thedefault HEX format if this command is not executed.Circuit ID sub-option is configured. Forward the packet after adding Option 82 with theconfigured circuit ID sub-option in ASCII format.Remote ID sub-option is configured. Forward the packet after adding Option 82 with theconfigured remote ID sub-option in ASCII format.The circuit ID and remote ID sub-options in Option 82, which can be configured simultaneously orseparately, are independent of each other in terms of configuration sequence.When the DHCP snooping device receives a DHCP response packet from the DHCP server, the DHCPsnooping device will delete the Option 82 field, if contained, before forwarding the packet, or will directlyforward the packet if the packet does not contain the Option 82 field.
