D-Link DGS-1210-12TS/ME [73/159] Configuration dhcp bootp relay dhcp bootp relay global settings

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4 Configuration DGS 1210 series Metro Ethernet Managed Switch User Manual From Month Day Enter the month DST and date DST will start on each year From Time In HH MM Enter the time of day that DST will start on each year To Month Day Enter the month DST and date DST will end on each year To Time HH MM Enter the time of day that DST will end on each year Click Apply to make the configurations take effect Configuration DHCP BOOTP Relay DHCP BOOTP Relay Global Settings User can enable and configure DHCP BOOTP Relay Global Settings on the Switch Figure 4 93 Configuration DHCP BOOTP Relay DHCP BOOTP Relay Globa Settings BOOTP Relay State This field can be toggled between Enabled and Disabled using the pull down menu It is used to enable or disable the DHCP BOOTP Relay service on the Switch The default is Disabled BOOTP Relay Hops Count Limit 1 16 This field allows an entry between 1 and 16 to define the maximum number of router hops DHCP BOOTP messages can be forwarded across The default hop count is 4 BOOTP Relay Time Threshold 0 65535 Allows an entry between Oand 65535 seconds and defines the maximum time limit for routing a DHCP BOOTP packet If a value of 0 is entered the Switch will not process the value in the seconds field of the BOOTP or DHCP packet If a non zero value is entered the Switch will use that value along with the hop count to determine whether to forward a given BOOTP or DHCP packet BOOTP Relay Port List Specify the ports for BOOTP relay DHCP Relay Agent Information Option 82 State This field can be toggled between Enabled and Disabled using the pull down menu It is used to enable or disable the DHCP Agent Information Option 82 on the Switch The default is Disabled Enabled When this field is toggled to Enabled the relay agent will insert and remove DHCP relay information option 82 field in messages between DHCP servers and clients When the relay agent receives the DHCP request it adds the option 82 information and the IP address of the relay agent if the relay agent is configured to the packet Once the option 82 information has been added to the packet it is sent on to the DHCP server When the DHCP server receives the packet if the server is capable of option 82 it can implement policies like restricting the number of IP addresses that can be assigned to a single remote ID or circuit ID Then the DHCP server echoes the option 82 field in the DHCP reply The DHCP server unicasts reply to the back to the relay agent if the request was relayed to the server by the relay agent The switch verifies that it originally inserted the option 82 data Finally the relay agent removes the option 82 field and forwards the packet to the switch port that connects to the DHCP client that sent the DHCP request Disabled If the field is toggled to Disabled the relay agent will not insert and remove DHCP relay information option 82 field in messages between DHCP servers and clients and the check and policy settings will have no effect 66