Cisco Catalyst 3750 Software Configuration Guide

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

Cisco Catalyst 3750 Specifications

General

Device Type	Switch
Switching Capacity	32 Gbps
Forwarding Rate	38.7 Mpps
Stacking Bandwidth	32 Gbps
RAM	128 MB
Jumbo Frame Support	Yes
Switch Type	Managed
Model	Catalyst 3750 Series
Uplink Interfaces	SFP
Form Factor	Rack-mountable
MAC Address Table Size	12, 000 entries
Routing Protocol	RIP, OSPF, EIGRP
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Layer 3 switching, Layer 2 switching, auto-negotiation, BOOTP support, ARP support, VLAN support, auto-uplink (auto MDI/MDI-X), IGMP snooping, traffic shaping, MAC address filtering, Quality of Service (QoS), Jumbo Frames support, MLD snooping, Dynamic ARP Inspection (DAI), Cisco EnergyWise technology
Power over Ethernet (PoE)	PoE
Operating Temperature	-5 - 45 °C
Operating Humidity	10% to 85% non-condensing