DHCP Configuration
Fixed Switch Configuration Guide 4-17
IP Address Pools
IP address pools must be configured for both automatic and manual IP address allocation by a
DHCP server.
Automatic IP Address Pools
When configuring an IP address pool for dynamic IP address assignment, the only required steps
are to name the pool and define the network number and mask for the pool using the set dhcp
pool network command. Note that:
• When the switch is configured for routing and the IP address pool is associated with a routing
interface, the pool has to be in the same subnet as the routed interface and use the same mask
configured on the routed interface
• When the switch is not configured for routing, the pool has to be in the same subnet and use
the same mask as the system host port IP address.
• You can limit the scope of addresses assigned to a pool for dynamic address assignment with
the set dhcp exclude command. Up to 128 non-overlapping address ranges can be excluded
on the Fixed Switches. For example:
set dhcp exclude 192.0.0.1 192.0.0.10
For more information about configuring automatic IP address pools, see “Configuring DHCP IP
Address Pools” on page 4-21.
Manual IP Address Pools
When you are configuring static address pools for manual address assignment with set dhcp pool
commands, the only required steps are to name the pool, configure either the hardware address of
the client or the client identifier, and configure the IP address and mask for the manual binding.
For more information about configuring manual IP address pools, see “Configuring DHCP IP
Address Pools” on page 4-21.
Configuring a DHCP Server
On Fixed Switch platforms that support basic routing, there are two ways to configure a DHCP
server: one is to associate the DHCP address pool with the switch’s host port IP address, and the
other is to associate the DHCP address pool with a routed interface.
Since on a Fixed Switch platform that supports routing, the host port IP address cannot fall within
a configured routed interface on the system, a typical system configured with routing interfaces
will not have a host port IP address. Therefore, all DHCP pools would be associated with routed
interfaces.
On the I-Series, which does not support routing, the DHCP address pool must be associated with
the switch’s host port IP address.
Refer to Table 4-7 on page 4-20 for a list of default DHCP server settings.
Note: The IP address of the system’s host port or the routed interface is automatically
excluded.
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