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
Table 3-3 Related Commands
In the sample show cable qos profile output response, note the added IP precedence column:
CMTS01# show cable qos profile
Service Prio Max Guarantee Max Max tx TOS TOS Create B IP
class upstream upstream downstream burst mask value by priv prec
bandwidth bandwidth bandwidth enab enab
1 0 0 0 0 0 0x0 0x0 cmts no no
2 0 64000 0 1000000 0 0x0 0x0 cmts no no
3 0 3120 31200 0 0 0x0 0x0 cmts yes
no
4 7 87200 87200 0 0 0x0 0x0 cmts yes
yes
5 0 256000 128000 1000000 0
0x0 0x0 cm no yes
The software provides QoS based on the CM SID. Every QoS profile carries a parameter maximum
downstream rate which is used to provide peak rate limiting and traffic shaping on the downstream.
When the particular CM supports combined high priority and data traffic, rate exceeded data packets
might shut out or delay higher priority packets, degrading quality. As a solution, IP precedence bits are
used as a basic differentiator to provide independent rate limits for different traffic streams as desired.
IP Type of Service Overwrite Mask Hex value of the mask bits.
IP Type of Service Overwrite Value Value of the mask byte. This is the value the CMTS
will overwrite into the ToS field (after masking bits
specified in the ToS-mask parameter) of the IP
datagram before forwarding the datagram into IP
backbone/downstream. The IP ToS overwrite feature
helps to propagate cable access QoS onto the IP
backbone.
Downstream Maximum Rate (bps) Minimum upstream transmission rate in bits per
second.
Created by Identity of the profile creator.
Baseline Privacy Enabled Reports yes if Baseline Privacy is enabled for this QoS
profile. Reports no if Baseline Privacy is not enabled
for this Qos profile.
IP Precedence rate limits Value of the IP precedence and the transmission rate
limit in bits per second.
Field Description
Command Description
cable qos permission Sets permissions for updating QoS tables.
cable qos profile Configures QoS profiles.
show cable qos permission Displays the status of permissions for updating QoS tables.