Cisco 500 Series Administration Manual page 370

IP Configuration
DHCP Server
STEP 1
STEP 2
STEP 3
Cisco 500 Series Managed Switch Administration Guide
DHCPv4 Server
To configure the device as a DHCPv4 server:
Click IP Configuration > IPv4 Management and Interfaces > DHCP Server >
Properties to display the Properties page.
Select Enable to configure the device as a DHCP server.
Click Apply. The device immediately begins functioning as a DHCP server.
However, it does not assign IP addresses to clients until a pool is created.
Network Pool
When the device is serving as a DHCP server, one or more pools of IP addresses
must be defined, from which the device will allocate IP addresses to clients. Each
network pool contains a range of addresses that belong to a specific subnet.
These addresses are allocated to various clients within that subnet.
When a client requests an IP address, the device as DHCP server allocates an IP
address according to the following:
• Directly-attached Client—The device allocates an address from the
network pool whose subnet matches the subnet configured on the device's
IP interface from which the DHCP request was received.
• Remote Client—The device takes an IP address from the network pool
whose first relay subnet, which is connected directly to the client, matches
the subnet configured on one of devices IP interfaces.
- If the message arrived directly (not via DHCP Relay) the pool is a Local
pool and belongs to one of IP subnets defined on the input layer 2
interface. In this case, the IP mask of the pool equals to the IP mask of the
IP interface and the minimum and maximum IP addresses of the pool
belong to the IP subnet.
- If the message arrived via DHCP relay, the address used belongs to the
IP subnet specified by minimum IP address and IP mask of the pool and
the pool is a remote pool.
Up to eight network pools can be defined.
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