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276 Quality of Service (QoS) Commands
classofservice dot1p-mapping
By default, SFTOS 2.4.1 configures all egress queues in weighted round robin mode with
equal minimum bandwidths. This means that no egress queue will be given priority over any
other. To change this, in weighted round robin mode, use the
cos-queue min-bandwidth
command to assign minimum bandwidths to each queue. You should then see queue 3 get the
appropriate share of the bandwidth. Alternatively, use the
cos-queue strict command to
force strict priority mode, which will give egress queue 3 absolute priority over all other
queues.
By default, bandwidth is divided into 28 slices (we get 28 by adding 1 through 7—
representing seven priority queues), and then it is allocated so that the highest priority queue
gets the most bandwidth. When you use a CoS command to assign a priority queue, you set
the priority from 0 to 6 (highest priority).
classofservice dot1p-mapping
This command maps an 802.1p priority to an internal traffic class.
Syntax
classofservice dot1p-mapping userpriority trafficclass
The userpriority range is 0-7.
The
trafficclass range is 0-3.
The
no form of this command is not supported.
Modes
Global Config; Interface Config; Interface Range, which is indicated by the
(conf-if-range-
interface)# prompt, such as (conf-if-range-vlan 10-20)#.
Note: Honoring 802.1p bits is enabled by default. 802.1p honoring can be disabled
with no classofservice trust (in either Global Config and Interface Config modes).
Table 22 Default CoS Queue Prioritization
Queue
Fraction (%) of Total
Bandwidth
0 1/28 (3.57%)
1 2/28 (7.14%)
2 3/28 (10.71%)
3 4/28 (14.28%)
4 5/28 (17.86%)
5 6/28 (21.43%)
6 7/28 (25%)