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Cuda 12000 IP Access Switch CLI-based Administration Guide
DHCP and BOOTP Policies 251
DHCP and BOOTP Policies
You can use Dynamic Host Configuration Protocol (DHCP) and Bootstrap
Protocol (BOOTP) policies to control which devices obtain IP addresses and
which DHCP and BOOTP servers allocate those addresses. This section
provides information and procedures about configuring DHCP and BOOTP
policies on the Cuda 12000 and includes the following sections:
■ About DHCP Policies
■ About BOOTP Policies
■ Configuring DHCP and BOOTP Policies
■ Configuring Default Policies
About DHCP Policies
A DOCSIS- or EuroDOCSIS-compliant network uses DHCP for dynamic
assignment of IP addresses. A DHCP server allocates addresses and other IP
operational parameters to requesting cable modems, CPE devices and MTA
devices. DOCSIS and EuroDOCSIS modules serve as cable modem
termination systems and, as such, also function as DHCP relay agents. As
relay agents, these cable interfaces relay DHCP requests and responses
between the DHCP server and cable modems, CPE devices and MTA devices.
DHCP policies allow you to control and restrict the forwarding of DHCP
requests. Specifically, DHCP policies allow matching on several parameters in
the DHCP packet. It then uses the result of this matching to determine which
list of servers to forward the packet to; or it can reject (drop) the packet to
deny the requesting client an address.
DHCP policies allow you to do the following:
■ Prevent select modems, CPE devices and MTA devices from obtaining IP
addresses.
■ Direct DHCP requests to particular DHCP servers based on whether the
request originated from a modem, CPE device or MTA device.
■ Direct DHCP requests to particular DHCP servers based on the cable
modem’s, CPE’s or MTA’s MAC address.
■ Direct DHCP requests to particular servers based on which interface it was
received.