D-Link DXS-3400 Emulator - Page 258
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DXS-3400 Series Lite Layer 3 Stackable 10GbE Managed Switch CLI Reference Guide Example This example shows how a DHCP relay pool "pool1" is created. In the relay pool, the subnet 172.19.10.0/255.255.255.0 is specified as the source subnet and 10.2.1.1 is specified as the relay destination address. Switch# configure terminal Switch(config)# ip dhcp pool pool1 Switch(config-dhcp-pool)# relay source 172.19.10.0 255.255.255.0 Switch(config-dhcp-pool)# relay destination 10.2.1.1 Switch(config-dhcp-pool)# 21-16 relay source This command is used to specify the source subnet of client packets. Use the no form of this command to remove the source subnet relay source IP-ADDRESS SUBNET-MASK no relay source IP-ADDRESS SUBNET-MASK Parameters IP-ADDRESS SUBNET-MASK Specifies the source subnet of client packets. Specifies the network mask of the source subnet. Default None. Command Mode DHCP Pool Configuration Mode. Command Default Level Level: 12. Usage Guideline In addition to relay DHCP packets based on the ip helper-address command, the relay destination of DHCP server can be specified in DHCP relay pool. To do this, use the ip dhcp pool command to enter the DHCP pool configuration mode, use the relay source command to specify the source subnet of the client requests and 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 anyone of the relay source, 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 rely source of a relay pool, the packet will be relayed based on this relay pool. Otherwise, the packet is relayed based on the IP helper address configured on the received interface. 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, if the interface that receives the packet has no IP address configured. 254
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