D-Link DGS-1250 Emulator - Page 122
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DGS-1250 Series Gigabit Ethernet Smart Managed Switch CLI Reference Guide Command Mode DHCP Pool Configuration Mode. Usage Guideline The relay destination of the DHCP server can be specified in the DHCP relay pool. To do this, use the ip dhcp pool command to enter the DHCP Pool Configuration Mode and then use the relay source command to specify the source subnet of the client requests. Use the relay destination command to specify the relay destination server address. Multiple relay sources and multiple relay destinations can be specified in a pool. If a packet matches any of the relay sources, the packet will be forwarded to all of the relay destinations. When receiving a DHCP request packet, if the subnet of the received packet matches the relay source of a relay pool, the packet will be relayed based on this relay pool. To relay a packet based on the relay pool, if the request packet is a relayed packet, the GIADDR of the packet is the source of the request. If the request packet is not a relayed packet, the subnet of the received interface is the source of the packet. In a DHCP relay pool, administrators can further use the class command and the relay target command to associate a list of relay target addresses with a DHCP class. The DHCP packet will not be relayed when the interface that receives the packet has no IP address configured. Example This example shows how to create a DHCP relay pool, called pool2. In the relay pool, the subnet 172.19.18.0.0/255.255.255.0 is specified as the source subnet and 10.2.1.10 is specified as the relay destination address. Switch# configure terminal Switch(config)# ip dhcp pool pool2 Switch(config-dhcp-pool)# relay source 172.19.18.0 255.255.255.0 Switch(config-dhcp-pool)# relay destination 10.2.1.10 Switch(config-dhcp-pool)# 15-21 relay target This command is used to specify a DHCP relay target for relaying packets that matches the value pattern of the option defined in the class. Use the no form of this command to delete a relay target. relay target IP-ADDRESS no relay target IP-ADDRESS Parameters IP-ADDRESS Specifies the relay target server IP address for the class. Default None. Command Mode DHCP Pool Configuration Mode. Usage Guideline In a DHCP relay pool, administrators can further use the class command and the relay target command to associate a list of relay target addresses with a DHCP class. When the client request matches a relay pool and the DHCP relay pool is defined with classes, the client request must match a class specified in the pool in order to be relayed. If the packet does not match any class in the pool, the packet will not be replayed. If the matched relay pool has no class defined, the request will be relayed to the relay destination of the matched relay pool. Multiple 119
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