For example, I will configure DHCPv4 Relay on Cisco N3K-C3064PQ-10GX. Initially, I configured this switch for L2, but some VLANs had to be configured as L3 and DHCPv4 Relay enabled.
Let’s connect to the switch and go to the configuration mode:
enable
configure terminal
First of all, let’s enable feature dhcp:
feature dhcp
Let’s enable dhcp relay globally:
ip dhcp relay
ipv6 dhcp relay
service dhcp
Disable if possible like this:
no ip dhcp relay
Since I configured interface vlan (SVI) for L3 and DHCPv4 Relay on it, we will also enable the feature interface-vlan:
feature interface-vlan
show feature
Assign an IP address and enable DHCPv4 Relay on it:
interface Vlan220
ip address 10.0.0.2/24
no shutdown
ip dhcp relay address 192.168.5.5
exit
And we will indicate the default route for the rest of the L3 traffic:
ip route 0.0.0.0/0 10.0.0.1
DHCPv4 Relay can also be configured for ethernet:
interface ethernet 1/1
ip dhcp relay address 192.168.5.5 use-vrf default
See also my articles:
Configuring Cisco N3K-C3064PQ-10GX
Configuring Cisco devices