Cisco DNCS System Release 2.7 3.7 4.2 Guia Do Desenho
2-10
Guidelines for Configuring the DBDS for DOCSIS
4000358 Rev B
DNCS and Server Configurations,
Continued
Mandatory DOCSIS1.0 Servers
This section describes the DHCP and TFTP server configurations that are mandatory
to operate DOCSIS in the DBDS. These servers must be configured for a DBDS
network in a DOCSIS environment.
For the purpose of this example, Cisco assumes that the cable service providers have
For the purpose of this example, Cisco assumes that the cable service providers have
already deployed the servers identified in this section for their high-speed data
service. The cable service providers are responsible for deploying and configuring
their servers. The DHCP servers must be able to differentiate between a DHCT CPE
DISCOVER message and a PC CPE DISCOVER message as discussed in this section.
DHCP Server
The DHCP server is required and provides IP addresses for stand-alone cable
DHCP Server
The DHCP server is required and provides IP addresses for stand-alone cable
modems, integrated cable modems, DHCT CPE, and PC CPE. You can use the same
DHCP server that is used for your existing stand-alone cable modems.
As stated earlier, the end-user devices, except PC CPE, should use the private
As stated earlier, the end-user devices, except PC CPE, should use the private
network 10 space. Different scopes must be configured on the DHCP server. The
network operator must make sure that the defined scope for the DHCT CPE
excludes both the DHCT CPE gateway IP address configured on the CMTS RF
interface and the DSG IP address to prevent address conflict.
The following example illustrates some of the possible scopes that can be configured
The following example illustrates some of the possible scopes that can be configured
on the DHCP server:
•
Registered ICM
10.0.0.2 – 10.0.7.254
•
DHCT CPE
10.32.0.3 – 10.32.7.254 (10.32.0.2 is not included here
because it is reserved for the DSG definition.)
•
Registered SCM
10.64.0.2 – 10.64.7.254
•
Unregistered SCM
10.96.0.2 – 10.96.0.254
•
Subscribed PC
Internet service provider public address range
Important: At manufacture, DHCTs are configured with both an RF MAC address
and an Ethernet MAC address. The DOCSIS cable modem uses the Ethernet MAC
address, and the DHCT CPE uses the RF MAC address. Network administrators
should be aware of these MAC addresses if they will be provisioned on the DHCP
server.