Benefits, Supported platforms – Cisco 32369 User Manual
The formal request for the offered IP address (the DHCPREQUEST message) that is sent by
the client is broadcast so that all other DHCP servers that received the DHCPDISCOVER broadcast
message from the client can reclaim the IP addresses that they offered to the client.
If the configuration parameters sent to the client in the DHCPOFFER unicast message by the DHCP
server are invalid (a misconfiguration error exists), the client returns a DHCPDECLINE broadcast
message to the DHCP server.
The DHCP server will send to the client a DHCPNAK denial broadcast message, which means the
offered configuration parameters have not been assigned, if an error has occurred during the
negotiation of the parameters or the client has been slow in responding to the DHCPOFFER message
(the DHCP server assigned the parameters to another client) of the DHCP server.
The Cisco IOS DHCP Server feature offers the following benefits:
Reduced Internet access costs
Using automatic IP address assignment at each remote site substantially reduces Internet access
costs. Static IP addresses are considerably more expensive to purchase than are automatically
allocated IP addresses.
Reduced client configuration tasks and costs
Because DHCP is easy to configure, it minimizes operational overhead and costs associated with
device configuration tasks and eases deployment by nontechnical users.
Because the DHCP server maintains configurations for several subnets, an administrator only
needs to update a single, central server when configuration parameters change.
This Cisco IOS DHCP Server feature is supported on the following routers and access servers:
Catalyst 5000 family switches with an installed Route Switch Module
Catalyst 6000 family switches with an installed MultiLayer Switch Feature Card
Catalyst 8500 series
Cisco 800 series
Cisco 1000 series
Cisco 1400 series
Cisco 1600 series
Cisco 1700 series (support for the Cisco 1700 series was added in Cisco IOS Release 12.0T)
Cisco 2500 series
Cisco 2600 series
Cisco 3600 series
Cisco 3800 series