Cisco Catalyst 3750 Software Configuration Guide

26-26
Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
Chapter 26 Configuring QoS
Understanding Hierarchical QoS
Queueing and Scheduling of Hierarchical Queues
Figure 26-11 shows the egress queueing and scheduling flowchart for a hierarchical queue.
Figure 26-11 Egress Queueing and Scheduling Flowchart for a Hierarchical Queue
98885
Receive packet from
egress queue-set
and scheduling.
Read QoS label (DSCP,
CoS, IP precedence,
or MPLS EXP bits).
Determine egress queue
and thresholds based on
the label, VLAN ID, or both.
Are thresholds
being exceeded?
Send the packet
out the ES port.
Queue the packet.
Service the queue
according to the
CBWFQ, LLQ, or both.
Drop packet.
Start
Done
Ye s
No
Rewrite any or all DSCP,
IP precedence,
MPLS EXP, and
CoS bits as appropriate.

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