D-Link xStack DGS-3120 Series Reference Manual page 411

xStack® DGS-3120 Series Layer 3 Managed Gigabit Ethernet Switch Web UI Reference Guide
DHCP Relay Option 60
State
DHCP Relay Option 61
State
Click the Apply button to accept the changes made for each individual section.
NOTE: If the Switch receives a packet that contains the Option 82 field from a DHCP client and the
information-checking feature is enabled, the Switch drops the packet because it is invalid.
However, in some instances, users may configure a client with the Option 82 field. In this
situation, disable the information check feature so that the Switch does not remove the Option
82 field from the packet. Users may configure the action that the Switch takes when it receives
a packet with existing Option 82 information by configuring the DHCP Agent Information Option
82 Policy.
The Implementation of DHCP Relay Agent Information Option 82
The DHCP Relay Option 82 command configures the DHCP relay agent information Option 82 setting of the
Switch. The formats for the circuit ID sub-option and the remote ID sub-option are as follows:
NOTE: For the circuit ID sub-option of a standalone switch, the module field is always zero.
Circuit ID sub-option format:
1 Sub-option type
2 Length
3 Circuit ID type
4 Length
5 VLAN: The incoming VLAN ID of DHCP client packet.
Vendor6 - If selected, the circuit ID will use a pre-defined string as the circuit ID.
Use the drop-down menu to enable or disable the use of the DHCP Relay Option
60 State feature. If the packet does not have Option 60 enabled, then the relay
servers cannot be determined based on the Option 60. In this case the relay
servers will be determined based on either Option 61 or per IPIF configured
servers. If the relay servers are determined based on Option 60 or Option 61, then
per IPIF configured servers will be ignored. If the relay servers are not determined
by either Option 60 or Option 61, then per IPIF configured servers will be used to
determine the relay servers.
enable – Select this option to enable the DHCP Relay Option 60 state, in order to
relay DHCP packets.
disable - Select this option to disable the DHCP Relay Option 60 state.
Use the drop-down menu to enable or disable the use of the DHCP Relay Option
61 State feature. When Option 61 is enabled, if the packet does not have Option
61, then the relay servers cannot be determined based on Option 61. If the relay
servers are determined based on Option 60 or Option 61, then per IPIF configured
servers will be ignored. If the relay servers are not determined either by Option 60
or Option 61, then per IPIF configured servers will be used to determine the relay
servers.
enable – Select this option to enable the DHCP Relay Option 61 state, in order to
relay DHCP packets.
disable - Select this option to disable the DHCP Relay Option 61 state.
Figure 9-2 Circuit ID Sub-option Format
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