General Qos Guidelines - Cisco Catalyst 2928 Software Configuration Manual

Configuring Standard QoS
Table 31-4
Feature
Reserved threshold
Maximum threshold
SRR shaped weights
(absolute)
SRR shared weights
1. A shaped weight of zero means that this queue is operating in shared mode.
2. One quarter of the bandwidth is allocated to each queue.
Table 31-5
Table 31-5
CoS Value
0, 1
2, 3
4
5
6, 7

General QoS Guidelines

These are general QoS guidelines:
•
•
•
Catalyst 2928 Switch Software Configuration Guide
31-8
Default Egress Queue Configuration (continued)
Queue 1
50 percent
400 percent
25
1
2
25
shows the default CoS output queue threshold map when QoS is enabled.
Default CoS Output Queue Threshold Map
Queue ID–Threshold ID
2–1
3–1
4–1
1–1
4–1
You configure QoS only on physical ports; there is no support for it at the VLAN or switch virtual
interface level.
Control traffic (such as spanning-tree bridge protocol data units [BPDUs] and routing update
packets) received by the switch are subject to all ingress QoS processing.
You are likely to lose data when you change queue settings; therefore, try to make changes when
traffic is at a minimum.
Queue 2 Queue 3
50 percent 50 percent
400 percent 400 percent
0 0
25 25
Chapter 31 Configuring QoS
Queue 4
50 percent
400 percent
0
25
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