D-Link DGS-1250 Emulator - Page 119
ip dhcp smart-relay, option hex DHCP relay
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DGS-1250 Series Gigabit Ethernet Smart Managed Switch CLI Reference Guide Usage Guideline The local relay relays the DHCP message to all local VLAN member ports based on the relay option setting. The local relay does not change the destination IP, destination MAC, and the gateway field of the packet. Example This example shows how to enable the local relay function on VLAN 100. Switch# configure terminal Switch(config)# ip dhcp local-relay vlan 100 Switch(config)# 15-17 ip dhcp smart-relay This command is used to enable the smart relay feature of the DHCP relay agent. Use the no form of this command to disable the smart relay function. ip dhcp smart-relay no ip dhcp smart-relay Parameters None. Default By default, this option is disabled. Command Mode Global Configuration Mode. Usage Guideline When the received interface of the packet has secondary addresses, by default, the relay agent set the gateway address field of the packet to the primary address of the interface. When smart relay is enabled, the relay agent will count the number that a client retries sending of the DISCOVER message. The relay agent will change the gateway address to the secondary address of the received interface after three retries. Example This example shows how to enable the smart relay function. Switch# configure terminal Switch(config)# ip dhcp smart-relay Switch(config)# 15-18 option hex (DHCP relay) This command is used to specify a DHCP option matching pattern for a DHCP class. Use the no form of this command to delete the specified matching pattern for a DHCP class. option CODE hex PATTERN [*] [bitmask MASK] no option CODE hex PATTERN [*] [bitmask MASK] 116
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