Consider the following when configuring DHCP Server:
To enable DHCP Server on a switch, you must configure at least one DHCP subnet and a management CLIP IP address.
If you deploy multiple VRFs, you must share DHCP pools across all VRFs.
You must configure local IP routing VLANs with relay configuration to be unique across all VRFs.
If you've tied the local VLAN to a different VRF than the management interface, configure inter-VRF policies so that DHCP requests can be relayed between VRFs.
DHCP Relay is also required. Depending on the size of your network, you can configure the relay on the same switch that hosts DHCP Server or on a neighboring switch. In either case, configure the relay with forwarding paths that point to the management CLIP IP interface of the switch(es) that hosts DHCP Server.
DHCP Server contains multiple configuration options. It's important to plan which settings you will configure and how you will apply them. Many settings are optional and you can apply them to DHCP Server globally, on a per-subnet basis, or to specific hosts. There is no need to configure the same setting at multiple levels.
The following rules apply to overlapping configurations:
Global settings apply to all subnets and hosts under DHCP Server.
Subnet settings apply to all hosts in the subnet. For that subnet, the subnet setting overrides any conflicting global setting.
Host settings apply only to a specific host. For that host, the host setting overrides any conflicting subnet or global setting.
You can configure the following settings using DHCP Server global settings:
Authoritative mode
Lease expiration
DNS servers
NTP servers
TFTP server IP address
TFTP server name
TFTP boot image file
Domain name
Custom option definitions
Custom option data
High Availability
NetBIOS Name Server
NetBIOS Node Type
DHCP Subnet (mandatory setting)
After a DHCP subnet is defined using global settings, you can configure the following settings within the subnet:
IP address pool (mandatory setting)
Router address
Lease expiration
DNS servers
NTP servers
TFTP server IP address
TFTP server name
TFTP boot image file
Subnet domain name
NetBIOS Name Server
NetBIOS Node Type
Custom option data
You can configure the following settings for a host:
MAC address
IP address
Hostname
TFTP server address
TFTP server name
TFTP boot image file