Cisco Catalyst 3750 - Generated Auto-Qos Configuration

26-30
Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
Chapter 26 Configuring QoS
Configuring Auto-QoS
Generated Auto-QoS Configuration
By default, auto-QoS is disabled on all ports.
When auto-QoS is enabled, it uses the ingress packet label to categorize traffic, to assign packet labels,
and to configure the ingress queues and egress queue-sets as shown in Table 26-2.
Table 26-3 shows the generated auto-QoS configuration for the ingress queues.
Table 26-4 shows the generated auto-QoS configuration for the egress queue-set.
Table 26-2 Traffic Types, Ingress Packet Labels, Assigned Packet Labels, and Queues
VoIP Data
Traffic
VoIP Control
Traffic
Routing Protocol
Traffic
STP BPDU
Traffic All Other Traffic
Ingress DSCP 46 26 – – –
Ingress CoS 5 3 6 7 –
DiffServ EF AF31 – – –
Assigned DSCP 46 26 48 56 0
Assigned CoS 5 3 6 7 0
CoS-to-ingress
queue map
2, 3, 4, 5, 6, 7 (queue 2) 0, 1 (queue 1)
CoS-to-egress
queue-set map
5 (queue 1) 3, 6, 7 (queue 2) 2, 4
(queue 3)
0, 1
(queue 4)
Table 26-3 Auto-QoS Configuration for the Ingress Queues
Ingress Queue Queue Number CoS-to-Queue Map
Queue Weight
(Bandwidth)
Queue (Buffer)
Size
SRR shared 1 0, 1 90 percent 90 percent
Priority 2 2, 3, 4, 5, 6, 7 10 percent 10 percent
Table 26-4 Auto-QoS Configuration for the Egress Queue-Set
Egress Queue
Queue Number
in the
Queue-Set CoS-to-Queue Map
Queue Weight
(Bandwidth)
Queue (Buffer)
Size
Priority (shaped) 1 5 10 percent 20 percent
SRR shared 2 3, 6, 7 10 percent 20 percent
SRR shared 3 2, 4 60 percent 20 percent
SRR shared 4 0, 1 20 percent 40 percent