D-Link xStack Reference Manual page 308

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xStack DGS-3120 Series Layer 3 Managed Gigabit Switch CLI Reference Guide
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.
Format
config dhcp_relay option_61 state [enable | disable]
Parameters
state - Specify whether the DHCP relay option 61 is enabled or disabled.
enable - Enables the function DHCP relay use option 61 ruler to relay DHCP packet.
disable - Disables the function DHCP relay use option 61 ruler to relay DHCP packet.
Restrictions
Only Administrator, Operator and Power-User level users can issue this command.
Example
To configure the state of dhcp_relay option 61:
DGS-3120-24TC:admin# config dhcp_relay option_61 state enable
Command: config dhcp_relay option_61 state enable
Success
DGS-3120-24TC:admin#
25-15 config dhcp_relay option_61 add
Description
This command is used to add a rule to determine the relay server based on option 61. The match
rule can base on either MAC address or a user-specified string. Only one relay server can be
specified for a MAC-address or a string.
If relay servers are determined based on option 60, and one relay server is determined based on
option 61, the final relay servers will be the union of these two sets of the servers.
Format
config dhcp_relay option_61 add [mac_address <macaddr> | string <desc_long 255>] [relay
<ipaddr> | drop]
Parameters
mac_address - The client's client-ID which is the hardware address of client.
<macaddr> - Enter the client's MAC address here.
string - The client's client-ID, which is specified by administrator.
<desc_long 255> - Enter the client's description here. This value can be up to 255 characters
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