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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-03
Chapter7 Overview of the Cisco Network Registrar for the Cisco uBR7200 Series
Create Policies for Class of Service or for Upgrading Cable Modem Cisco IOS Images
Create Policies for Class of Service or for Upgrading Cable
Modem Cisco IOS Images
To support Class of Service (CoS), define:
• Scope selection tags—Identifiers that describe types of scope configurations
Note This is needed for Option82.
• Client classes—Class with which a group of clients is associated
Note Scope selection tags are excluded from or included in client-classes.
• Client—Specific DHCP clients and the defined class to which they belong
To assign the CoS or use Option82, make a client entry with a MAC address and point to the appropriate
policy. To use client-based MAC provisioning, add a client entry “default - exclude,” then put in MAC
addresses for all devices (for example, cableinterfaces and PCs) in the client tab and select the policy
to use, including the appropriate tag.
Note For more detailed information about Cisco Network Registrar, please refer to the document Cisco
Network Registrar for the CiscouBR10000 Series Universal Broadband Routers.
CNR Steps to Support Subinterfaces
The CNR configuration is done differently if subinterfaces are configured. Here is an example. If you
have configured two ISP subinterfaces and one management subinterface on a CiscouBR7200series,
make sure that the management subinterface is the first subinterface that is configured. If cable interface
three—c3/0—is being used, create c3/0.1, c3/0.2 and c3/0.3 as three subinterfaces and c3/0.1 as the first
subinterface configured as the management subinterface.
Note The Cisco uBR7200 series requires management subinterfaces to route DHCP packets from CMs when
they first initialize because the Cisco uBR7200 series does not know the subinterfaces they belong to
until it has seen the IP addresses assigned to them by gleaning DHCP reply message from CNR.
In CNR, complete the following steps for such a configuration:
Step1 Create two scope selection tags such as: isp1-cm-tag and isp2-cm-tag
Step2 Configure three scopes; for example, mgmt-scope, isp1-cm-scope, and isp2-cm-scope such that
isp1-cm-scope and isp2-cm-scope each define mgmt-scope to be the primary scope
Step3 Also configure two scopes for PCs for each of the ISPs; isp1-pc-scope and isp2-pc-scope. For scope
isp1-cm-scope, configure isp1-cm-tag to be the scope selection tag. For scope isp2-cm-scope,
configure isp2-cm-tag to be the scope selection tag
Step4 Configure two client classes; for example, isp1-client-class and isp2-client-class
Step5 Create client entries with their MAC addresses for CMs that belong to ISP1 and assign them to
isp1-client-class. Also assign the scope selection tag isp1-cm-tag