D-Link DGS-3630 Emulator 1 - Page 420
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DGS-3630 Layer 3 Stackable Managed Switch CLI Reference Guide 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. Example This example shows how a DHCP relay pool "pool2" is created. 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)# 24-17 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 [vrf VRF-NAME | global] IP-ADDRESS no relay target [vrf VRF-NAME | global] IP-ADDRESS Parameters vrf VRF-NAME global IP-ADDRESS (Optional) Specifies the destination DHCP server IP address associate with a VRF space. (MI and EI Mode Only) (Optional) Specifies that the IP address is selected from the global address space. If the pool does not have any VRF configuration, the relay destination address defaults to the global address space. Specifies the relay target server IP address for the class. Default None. Command Mode DHCP Pool Class Configuration Mode. Command Default Level Level: 12. 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 415
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