Setup Guide

Example conguration of global DHCP relay source IPv4 or IPv6 interface
Following is the sample conguration to congure 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 congure 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 congure the above commands in the CONFIGURATION MODE, it will congure the loopback interface as the DHCP relay
source interface for forwarding the DHCP packets from DHCP client to server. When this command is congured in the CONFIGURATION
mode level, it is applied globally. So, all the DHCP packets will be relayed or forwarded through the congured L3 interface (loopback 1)
using the IPv4 (1.1.1.1/32) and IPv6 addresses (1::1/128) of the loopback conguration.
Interface level DHCP relay source IPv4 or IPv6 conguration
You can congure interface specic DHCP relay source IPv4 or IPv6 conguration.
If the DHCP relay source interface is congured on the interface level, the DHCP relay forwards the packets from these interfaces to the
DHCP server using the interface. In case, the DHCP relay source interface is not congured in the interface level (if congured), the DHCP
relay chooses the congured global DHCP relay source interface for forwarding the packets.
NOTE
:
The DHCP relay source IPv4 or IPv6 conguration at interface level takes precedence over the DHCP relay source IPv4 or IPv6
conguration at the global level.
• Specify the type of an interface and interface-number that should be used as a DHCP relay source interface at the interface level.
INTERFACE mode
{ip | ipv6} dhcp relay source-interface interface
Example conguration of interface level DHCP relay source IPv4 or IPv6 interface
Following are the steps to congure interface specic source IPv4 or IPv6 conguration for DHCP relay. The below example shows when
the DHCP relay uses the interface specic conguration and global source interface conguration depending on the conguration.
1 Conguring L3 interface with IPv4 or IPv6 address.
Following are the steps to congure a L3 interface (loopback) with IPv4 and IPv6 address in INTERFACE MODE.
Dell(conf)# interface loopback 2
Dell(conf-if-lo-1)# ip vrf forwarding vrf1
Dell(conf-if-lo-1)# ip address 2.2.2.2/32
Dell(conf-if-lo-1)# ipv6 address 2::2/128
Dell(conf-if-lo-1)# no shutdown
Dell(conf)# interface loopback 3
Dell(conf-if-lo-1)# ip vrf forwarding vrf2
Dell(conf-if-lo-1)# ip address 3.3.3.3/32
Dell(conf-if-lo-1)# ipv6 address 3::3/128
Dell(conf-if-lo-1)# no shutdown
2 Creating L3 interfaces with the DHCP helper conguration.
Following are the steps to congure IPv4 or IPv6 interfaces with the DHCP helper conguration. The below example shows two
VLAN interfaces (Vlan 2 and 4), DHCP helper (100.0.0.1 and 100::1) for the respective VLANs and the DHCP relay source IPv4 and
Dynamic Host
Conguration Protocol (DHCP) 317