Cisco WS-C6506 User Manual

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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 52 Configuring QoS
QoS Default Configuration
1p7q8t transmit-queue size percentages • Standard queue 1 (lowest priority): 25%
• Standard queue 2: 15%
• Standard queue 3: 15%
• Standard queue 4: 10%
• Standard queue 5: 10%
• Standard queue 6: 10%
• Standard queue 7 (highest priority): 10%
• Strict priority: 5%
1p3q8t standard transmit-queue
low:medium:high priority bandwidth
allocation ratio
20:100:200
1p7q8t standard transmit-queue
lowest-to-highest priority bandwidth
allocation ratio
10:20:30:40:40:70:70
1p2q1t standard transmit-queue low:high
priority bandwidth allocation ratio
100:255
2q2t, 1p2q2t, and 1p2q1t standard
transmit-queue low:high priority
bandwidth allocation ratio
5:255
1p3q1t standard transmit-queue
low:medium:high-priority bandwidth
allocation ratio
100:150:200
1q4t/2q2t receive and transmit-queue
CoS value/drop-threshold mapping
• Receive queue 1/drop threshold 1 (50%) and
transmit queue 1/drop threshold 1 (80%): CoS 0 and 1
• Receive queue 1/drop threshold 2 (60%) and
transmit queue 1/drop threshold 2 (100%): CoS 2 and 3
• Receive queue 1/drop threshold 3 (80%) and
transmit queue 2/drop threshold 1 (80%): CoS 4 and 5
• Receive queue 1/drop threshold 4 (100%) and
transmit queue 2/drop threshold 2 (100%): CoS 6 and 7
1q2t port receive-queue
CoS value/drop-threshold mapping and
threshold percentages
• Receive queue 1/drop threshold 1:
– CoS 0, 1, 2, 3, and 4
– Drop threshold: 80%
• Receive queue 1/drop threshold 2:
– CoS 5, 6, and 7
– Drop threshold: 100% (not configurable)
Note 1p2q2t transmit queues same as 1p1q4t/1p2q2t.
Table 52-3 QoS Default Configuration (continued)
Feature Default Value

Cisco WS-C6506 Specifications

General

Brand	Cisco
Model	WS-C6506
Category	Switch
Language	English