Default Standard Qos Configuration; Default Ingress Queue Configuration; Default Egress Queue Configuration - Cisco Catalyst 2928 Software Configuration Manual

Chapter 31 Configuring QoS

Default Standard QoS Configuration

QoS is disabled. There is no concept of trusted or untrusted ports because the packets are not modified
(the CoS and IP precedence values in the packet are not changed). Traffic is switched in pass-through
mode (packets are switched without any rewrites and classified as best effort without any policing).
When QoS is enabled with the mls qos global configuration command and all other QoS settings are at
their defaults, traffic is classified as best effort (the CoS value is set to 0) without any policing. The
default port trust state on all ports is untrusted. The default ingress and egress queue settings are
described in the
Queue Configuration" section on page

Default Ingress Queue Configuration

Table 31-2
Table 31-2
Feature
Buffer allocation
Bandwidth allocation
Priority queue bandwidth
WTD drop threshold 1
WTD drop threshold 2
1. The bandwidth is equally shared between the queues. SRR sends packets in shared mode only.
2. Queue 2 is the priority queue. SRR services the priority queue for its configured share before servicing the other queue.
Table 31-3
Table 31-3
CoS Value
0–4
5
6, 7

Default Egress Queue Configuration

Table 31-4
ports are mapped to queue-set 1. The port bandwidth limit is set to 100 percent and rate unlimited.
Table 31-4
Feature
Buffer allocation
WTD drop threshold 1
WTD drop threshold 2
OL-23389-01
"Default Ingress Queue Configuration" section on page 31-7
shows the default ingress queue configuration when QoS is enabled.
Default Ingress Queue Configuration
1
2
shows the default CoS input queue threshold map when QoS is enabled.
Default CoS Input Queue Threshold Map
Queue ID–Threshold ID
1–1
2–1
1–1
shows the default egress queue configuration for each queue-set when QoS is enabled. All
Default Egress Queue Configuration
Queue 1
25 percent
100 percent
100 percent
31-7.
Queue 1
90 percent
4
0
100 percent
100 percent
Queue 2
25 percent
200 percent
200 percent
Catalyst 2928 Switch Software Configuration Guide
Configuring Standard QoS
and the "Default Egress
Queue 2
10 percent
4
10
100 percent
100 percent
Queue 3 Queue 4
25 percent 25 percent
100 percent 100 percent
100 percent 100 percent
31-7