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Cisco uBR10012 Universal Broadband Router Software Configuration Guide
OL-1520-05
Chapter3 Configuring Cable Interface Features for the CiscouBR10012Router
Configuring the Upstream Cable Interface
Activating Upstream Admission Control
Upstream admission control tallies up the total amount of guaranteed minimum upstream throughput
reserved by CMs on an upstream interface. Once the total exceeds an allowable level, no more CMs
requiring a guaranteed minimum upstream rate are allowed online on that upstream port.
Cisco CMTS upstream admission control is turned off by default and must be activated. To set the
upstream admission control as a percentage of the upstream channel capacity, use the following
command in cable interface configuration mode. The admission control is set as a percentage of the
specified upstream channel capacity. The acceptable range is from 10 to 1000 percent.
Router(config-if)# cable upstream usport admission-control percentage
For example:
7246VXR(config-if)# cable upstream 0 admission-control ?
Max Reservation Limit As Percentage of Raw Channel Capacity
Syntax Description
Note If percentage is left blank or set to 100%, the CMTS will only allow a total up to the real available
upstream bandwidth to be guaranteed. If percentage is set to its maximum of 1000, then up to 10
times the real interface bandwidth may be “guaranteed”.
“Setting the Upstream Input Power
Level” section on page22 Provides instructions to set the upstream input power level in
decibels per millivolt (dBmV), and provides additional
information about the CiscouBR10000series CMTS controls
the output power levels of CMs
“Setting Upstream Rate Limiting
and Traffic Shaping” section on
page24
Provides instructions to activate traffic shaping on the
upstream. Upstream traffic shaping, available on the DOCSIS
upstream channel, delays the scheduling of the upstream
packet, which in turn causes the packet to be buffered on the
cable customer premises equipment (CPE) device, instead of
being dropped.
“Specifying Upstream Minislot
Size” section on page23 Provides instructions to specify the minislot size (in ticks) for
specific upstream cable interfaces. The minislot size and the
channel width are related to certain degree but not tightly
coupled.
Task Description
usport The upstream port that has admission control enabled.
percentage The optional percentage parameter specifies the overbooking rate that will be used
when deciding the amount of bandwidth that is available to be guaranteed.