Configuring Dhcp; Minimum Dhcp Configuration; Enabling Or Disabling The Dhcp Feature - Cisco Nexus 9000 Series Configuration Manual

Configuring DHCP

Parameters
DHCP snooping Option 82 support
DHCP snooping trust
DHCP relay agent
DHCPv6 relay agent
VRF support for the DHCP relay agent
VRF support for the DHCPv6 relay agent
DHCP Option 82 for relay agent
DHCP smart relay agent
DHCP server IP address
Configuring DHCP

Minimum DHCP Configuration

Step 1 Enable the DHCP feature.
When the DHCP feature is disabled, you cannot configure DHCP snooping.
Step 2
Enable DHCP snooping globally.
Step 3 Enable DHCP snooping on at least one VLAN.
By default, DHCP snooping is disabled on all VLANs.
Step 4 Make sure that the DHCP server is connected to the device using a trusted interface.
Step 5
(Optional) Enable the DHCP relay agent.
Step 6 (Optional) If DHCP servers and clients are in different VRFs, do the following:
a) Enable Option 82 for the DHCP relay agent.
b) Enable VRF support for the DHCP relay agent.
Step 7
(Optional) Configure an interface with the IP address of the DHCP server.

Enabling or Disabling the DHCP Feature

You can enable or disable the DHCP feature on the device. By default, DHCP is disabled.
When the DHCP feature is disabled, you cannot configure the DHCP relay agent, DHCP snooping, or any of
the features that depend on DHCP. In addition, all DHCP configuration is removed from the device.
Default
Disabled
Untrusted
Enabled
Enabled
Disabled
Disabled
Disabled
Disabled
None
Cisco Nexus 9000 Series NX-OS Security Configuration Guide, Release 9.x
Configuring DHCP
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