Concept Guide

164 | ip dhcp Dell Networking W-Series Instant 6.4.3.1-4.2.0.0 | CLI Reference Guide
Parameter Description Range Default
scopes. The subnet mask and the
network determine the size of
subnet.
vlan-id <VLAN_
IP>mask <VLAN mask>
Defines the IP address and subnet
mask for vlan of the DHCP server.
— —
no…
Removes any existing configuration. — —
Usage Guidelines
Use this command to configure the DHCP address assignment for the branches connected to the corporate
network through VPN. You can configure the following types of DHCP profiles.
l Distributed, L2—In this mode, the Virtual Controller acts as the DHCP server, but the default gateway is in
the data center. Based on the number of clients specified for each branch, the range of IP addresses is
divided. Based on the IP address range and client count configuration, the DHCP server in the Virtual
Controller controls a scope that is a subset of the complete IP Address range for the subnet distributed
across all the branches. This DHCP Assignment mode is used with the L2 forwarding mode.
l Distributed, L3—In this mode, the Virtual Controller acts as the DHCP server and the default gateway.
Based on the number of clients specified for each branch, the range of IP addresses is divided. Based on the
IP address range and client count configuration, the DHCP server in the Virtual Controller is configured with
a unique subnet and a corresponding scope.
l Local—In this mode, the Virtual Controller acts as both the DHCP Server and the default gateway. The
configured subnet and the corresponding DHCP scope are independent of subnets configured in other W-
IAP clusters. The Virtual Controller assigns an IP address from a local subnet and forwards traffic to both
corporate and non-corporate destinations. The network address is translated appropriately and the
packet is forwarded through the IPSec tunnel or through the uplink. This DHCP assignment mode is used
for the NAT forwarding mode.
l Local, L2—In this mode, the virtual controller acts as a DHCP server with data center as the gateway. When
Local, L2 DHCP scope is selected, the network address translation for client IPs is not carried out at the
source.
l Local, L3— In this mode, the Virtual Controller acts as a DHCP server and the gateway, and assigns an IP
address from the local subnet. The W-IAP routes the packets sent by clients on its uplink. This mode does
not provide corporate access through the IPsec tunnel. This DHCP assignment mode is used with the L3
forwarding mode.
l Centralized, L2—When a Centralized, L2 DHCP scope is configured, the Virtual Controller bridges the
DHCP traffic to the controller over the VPN/GRE tunnel. The IP address is obtained from the DHCP server
behind the controller serving the VLAN/GRE of the client. This DHCP assignment mode also allows you to
add the DHCP option 82 to the DHCP traffic forwarded to the controller.
l Centralized, L3—For Centralized, L3 clients, the Virtual Controller acts as a DHCP relay agent that forwards
the DHCP traffic to the DHCP server located either in the corporate or local network. The centralized L3
VLAN IP is used as the source IP. The IP address is obtained from the DHCP server.
Example
The following example configures a distributed,l2 DHCP scope:
(Instant AP)(config)# ip dhcp corpNetwork1
(Instant AP)(DHCP Profile"corpNetwork1")# ip dhcp server-type distributed,l2
(Instant AP)(DHCP Profile"corpNetwork1")# server-vlan 1