pc-arlington1_2-0 208.16.182.16 255.255.255.248 assignable 208.16.182.17-208.16.182.22
tagComputer Default GW=208.16.182.17 (assigned by scripts)
pc-toledo1_3-0 208.16.182.24 255.255.255.248 assignable 208.16.182.2-208.16.182.30 tagComputer
Default GW=208.16.182.25 (assigned by scripts)
Remember the last valid address in the .248 subnet range is the broadcast address; do not use this.Note
Creating 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
This is needed for Option82.Note
• Client classes—Class with which a group of clients is associated
Scope selection tags are excluded from or included in client-classes.Note
• 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, cable interfaces and PCs) in the client tab and select the policy to use, including
the appropriate tag.
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 Cisco cBR-8 router, make sure that
the management subinterface is the first subinterface that is configured. If cable interface three—c3/0/0—is
being used, create c3/0/0.1, c3/0/0.2 and c3/0/0.3 as three subinterfaces and c3/0/0.1 as the first subinterface
configured as the management subinterface.
The Cisco cBR-8 router requires management subinterfaces to route DHCP packets from CMs when they
first initialize because the Cisco cBR-8 router 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.
Note
In CNR, complete the following steps for such a configuration:
Cisco cBR Series Converged Broadband Routers Application—Voice and Video Configuration Guide
50
Cisco Network Registrar for the Cisco CMTS Routers
Creating Policies for Class of Service or for Upgrading Cable Modem Cisco IOS Images
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