Installation guide

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Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 3 Configuring the Cisco Cable Interface
Setting Quality of Service (QoS) for Higher Priority Traffic
no cable qos profile {groupnum | grant-interval {interval} | grant-size {size} |
guaranteed-upstream {rate} | ip-precedence {value} | max-burst {rate} | max-downstream
{rate} | max-upstream {rate} | name {string} | priority {value} | privacy | ToS-overwrite
{value}}
The following table describes the syntax and values for these commands.
Syntax Valid Values
groupnum QoS profile group number. Qos profiles 1 and 2 are required by the
system. QoS profile 1 is used during registration, and QoS profile 2 is
the default QoS profile. Both profiles are preconfigured and cannot be
removed. However, you can modify these profiles.
grant-interval The periodic interval in microseconds at which the CM wants to send
the fixed-sized upstream MAC frames. This value is used to compute
the period between constant bit rate (CBR) slots for the CM. Valid
range is 0 to 65535.
grant-size The size of the DOCSIS MAC frame the CM wants periodically to send
on the upstream transmission. This value in bytes does not include any
PHY layer overhead. It includes the complete fixed MAC frame size
starting from the frame control byte to the CRC of the protocol data unit
(PDU). This parameter is used by the CMTS to set the size of the
periodic CBR slot for the CM after adding the PHY overhead.
guaranteed-upstream Guaranteed minimum upstream rate in kilobytes per second. Valid
values are 0 through 100000. Default value is 0 (no reserved rate).
ip-precedence Bits in the ToS byte that enable you to configure individual data rate
limits on a per modem basis. Valid values are 0 to 7.
max-burst Maximum upstream transmit burst size in bytes that the modem can
send for any single transmit burst. Valid values are 0 to 65535 bytes.
Default value is 0 (no limit).
max-downstream Maximum downstream data rate in kilobytes per second that a modem
using this QoS profile receives. Valid values are 0 to 100000. Default
value is 0 (no downstream rate limit).
max-upstream Maximum upstream data rate in kilobytes per second that a modem
using this QoS profile receives. Valid values are 0 to 255. Default value
is 0 (no upstream rate limit).
name QoS name string.
priority Relative priority number assigned to upstream traffic by this QoS
profile. Valid values are 0 to 7, with 7 being the highest priority.
Default value is 0.
privacy Enables cable baseline privacy.
ToS-overwrite Overwrite the ToS field in the IP datagrams received on the upstream
before forwarding them downstream (or IP backbone). This parameter
sets the hexadecimal mask bits to a hexadecimal value, thereby helping
the CMTS identify datagrams for QoS on the backbone. Valid range is
0x0 to 0xFF.
value The value substituted for the ToS value. See
ToS-overwrite.