32-30
Catalyst 3750 Switch Software Configuration Guide
78-16180-02
Chapter 32 Configuring QoS
Configuring Standard QoS
Default Egress Queue Configuration
Table 32-9 shows the default egress queue configuration for each queue-set when QoS is enabled. All
ports are mapped to queue-set 1. The port bandwidth limit is set to 100 percent and rate unlimited.
Table 32-10 shows the default CoS output queue threshold map when QoS is enabled.
Table 32-11 shows the default DSCP output queue threshold map when QoS is enabled.
Default Mapping Table Configuration
The default CoS-to-DSCP map is shown in Table 32-12 on page 32-50.
The default IP-precedence-to-DSCP map is shown in Table 32-13 on page 32-50.
The default DSCP-to-CoS map is shown in Table 32-14 on page 32-52.
The default DSCP-to-DSCP-mutation map is a null map, which maps an incoming DSCP value to the
same DSCP value.
The default policed-DSCP map is a null map, which maps an incoming DSCP value to the same DSCP
value (no markdown).
Table 32-9 Default Egress Queue Configuration
Feature Queue 1 Queue 2 Queue 3 Queue 4
Buffer Allocation 25 percent 25 percent 25 percent 25 percent
WTD Drop Threshold 1 100 percent 50 percent 100 percent 100 percent
WTD Drop Threshold 2 100 percent 50 percent 100 percent 100 percent
Reserved Threshold 50 percent 100 percent 50 percent 50 percent
Maximum Threshold 400 percent 400 percent 400 percent 400 percent
SRR Shaped Weights
(absolute)
1
1. A shaped weight of zero means that this queue is operating in shared mode.
25 0 0 0
SRR Shared Weights
2
2. One quarter of the bandwidth is allocated to each queue.
25 25 25 25
Table 32-10 Default CoS Output Queue Threshold Map
CoS Value 0, 1 2, 3 4 5 6, 7
Queue ID - Threshold ID 2 - 1 3 - 1 4 - 1 1 -1 4 - 1
Table 32-11 Default DSCP Output Queue Threshold Map
DSCP Value 0–15 16–31 32–39 40–47 48–63
Queue ID - Threshold ID 2 - 1 3 - 1 4 - 1 1 - 1 4 - 1
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