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Dell Configuration Guide for the S4048–ON System 9.14.2.4

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Global DHCP relay source IPv4 or IPv6 configuration

You can configure global DHCP relay source IPv4 or IPv6 configuration using the command {ip | ipv6} dhcp-relay source-interface interface command in the CONFIGURATION mode. DHCP relay uses the IPv4 or IPv6 global source address of the configured interface for relaying packets to the DHCP server. For example, if you configure DHCP relay source interface as a loopback interface, the DHCP relay uses the configured loopback interface to forward the packets to the DHCP server using the configured IPv4 or IPv6 address. The source interface can be a VLAN, LAG, physical and loopback interfaces.

Specify the type of an interface and interface-number that should be used as a DHCP relay source interface.
CONFIGURATION mode
{ip | ipv6} dhcp relay source-interface interface

Example configuration of global DHCP relay source IPv4 or IPv6 interface

Following is the sample configuration to configure loopback interface with IPv4 and IPv6 address in CONFIGURATION MODE.

Dell(conf)# interface loopback 1
Dell(conf-if-lo-1)# ip vrf forwarding vrf1
Dell(conf-if-lo-1)# ip address 1.1.1.1/32
Dell(conf-if-lo-1)# ipv6 address 1::1/128
Dell(conf-if-lo-1)# no shutdown

To configure the loopback interface as IPv4 or IPv6 DHCP relay source interface, enter the following commands in the CONFIGURATION MODE.

Dell(conf)# ip dhcp relay source-interface loopback 1
Dell(conf)# ipv6 dhcp relay source-interface loopback 1

When you configure the above commands in the CONFIGURATION MODE, it will configure the loopback interface as the DHCP relay source interface for forwarding the DHCP packets from DHCP client to server. When this command is configured in the CONFIGURATION mode level, it is applied globally. So, all the DHCP packets will be relayed or forwarded through the configured L3 interface (loopback 1) using the IPv4 (1.1.1.1/32) and IPv6 addresses (1::1/128) of the loopback configuration.


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