• To reinstall management routes added by the DHCP client that is removed or replaced by the samestatically configured management routes, release the DHCP IP address and renew it on themanagement interface.• Management routes added by the DHCP client have higher precedence over the same staticallyconfigured management route. Static routes are not removed from the running configuration if adynamically acquired management route added by the DHCP client overwrites a static managementroute.• Management routes added by the DHCP client are not added to the running configuration.NOTE: Management routes added by the DHCP client include the specific routes to reach a DHCPserver in a different subnet and the management route.DHCP Client Operation with Other FeaturesThe DHCP client operates with other Dell Networking OS features, as the following describes.StackingThe DHCP client daemon runs only on the master unit and handles all DHCP packet transactions. Itperiodically synchronizes the lease file with the standby unit.When a stack failover occurs, the new master requires the same DHCP server-assigned IP address onDHCP client interfaces. The new master reinitiates a DHCP packet transaction by sending a DHCPdiscovery packet on nonbound interfaces.Virtual Link Trunking (VLT)A DHCP client is not supported on VLT interfaces.VLAN and Port ChannelsDHCP client configuration and behavior are the same on Virtual LAN (VLAN) and port-channel (LAG)interfaces as on a physical interface.DHCP SnoopingA DHCP client can run on a switch simultaneously with the DHCP snooping feature as follows:• If you enable DHCP snooping globally on a switch and you enable a DHCP client on an interface, thetrust port, source MAC address, and snooping table validations are not performed on the interface byDHCP snooping for packets destined to the DHCP client daemon.The following criteria determine packets destined for the DHCP client:– DHCP is enabled on the interface.– The user data protocol (UDP) destination port in the packet is 68.– The chaddr (change address) in the DHCP header of the packet is the same as the interface’sMAC address.• An entry in the DHCP snooping table is not added for a DHCP client interface.DHCP ServerA switch can operate as a DHCP client and a DHCP server. DHCP client interfaces cannot acquire adynamic IP address from the DHCP server running on the switch. Acquire a dynamic IP address fromanother DHCP server.262 Dynamic Host Configuration Protocol (DHCP)
