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
Refer to the following example to configure QoS profile 4 with guaranteed upstream of 2 kbps,
maximum transmission burst of 2, an IP precedence of 7, a maximum downstream rate of 300 kbps, with
a priority of 4, cable baseline privacy set, and a ToS-overwrite mask and value byte (in hex) of 0x7:
Router(config)# cable qos profile 4 name Mondayqos
Router(config)# cable qos profile 4 guaranteed-upstream 2
Router(config)# cable qos profile 4 max-burst 2
Router(config)# cable qos profile 4 ip-precedence 7 max-downstream 300
Router(config)# cable qos profile 4 priority 4
Router(config)# cable qos profile 4 ToS-overwrite 0x7
To display QoS profiles, use the show cable qos profile privileged EXEC configuration command.
Note An optional “verbose” parameter is added:
show cable qos profile qos profile index verbose
The qos profile index option displays the index of the specified QoS profile. The verbose option displays
all details for the specified QoS profile index.
The following example shows the full QoS table for profile 30:
router# show cable qos profile 30 verbose
Profile Index 30
Name test
Upstream Traffic Priority 7
Upstream Maximum Rate (bps) 6000000
Upstream Guaranteed Rate (bps) 60000000
Unsolicited Grant Size (bytes) 100
Unsolicited Grant Interval (usecs) 55000
Upstream Maximum Transmit Burst (bytes) 256
IP Type of Service Overwrite Mask 0x0
IP Type of Service Overwrite Value 0x0
Downstream Maximum Rate (bps) 100000000
Created By mgmt
Baseline Privacy Enabled yes
IP precedence rate limits
IP precedence 2
Rate Limit 100000
Table 3-2 describes the fields shown in the show cable qos profile displays.
Field Description
Profile Index Profile number.
Name The name string for this profile.
Upstream Traffic Priority Priority level for upstream traffic.
Upstream Maximum Rate (bps) Maximum upstream transmission rate in bits per
second.
Upstream Guarantee Rate (bps) Guaranteed minimum upstream rate in bits per second.
Unsolicited Grant Size (bytes) Number of grant-size parameters in bytes. Grant size is
used by the CMTS to set the size of the periodic CBR
slot for the CM after adding the PHY overhead.
Unsolicited Grant Interval (usecs) Number of unsolicited grant intervals in microseconds.
The grant-interval parameter is used to compute the
period between CBR slots for the CM.
Upstream Maximum Transmit Burst (bytes) Maximum transmit burst size in bytes.