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Data Sheet

Advanced QoS

The Cisco Catalyst 3560 offers superior multilayer, granular QoS features to help ensure that

network traffic is classified and prioritized, and that congestion is avoided in the best possible

manner. Configuration of QoS is greatly simplified through automatic QoS (Auto QoS), a feature

that detects Cisco IP phones and automatically configures the switch for the appropriate

classification and egress queuing. This optimizes traffic prioritization and network availability

without the challenge of a complex configuration.

The Cisco Catalyst 3560 can classify, reclassify, police, mark, queue, and schedule incoming

packets, and can queue and schedule packets at egress. Packet classification allows the network

elements to discriminate between various traffic flows and enforce policies based on Layer 2 and

Layer 3 QoS fields.

To implement QoS, the Cisco Catalyst 3560 Series Switch first identifies traffic flows or packet

groups, and classifies or reclassifies these groups using the Differentiated Services Code Point

(DSCP) field or the 802.1p Class of Service (CoS) field. Classification and reclassification can be

based on criteria as specific as the source or destination IP address, source or destination MAC

address, or the Layer 4 TCP or UDP port. At the ingress, the Cisco Catalyst 3560 also polices to

determine whether a packet is in or out of profile, marks to change the classification label, passes

through or drops out of profile packets, and queues packets based on classification. Control- and

data-plane ACLs are supported on all ports to help ensure proper treatment on a per-packet basis.

The Cisco Catalyst 3560 supports four egress queues per port, allowing the network administrator

to be more discriminating and specific in assigning priorities for the various applications on the

LAN. At egress, the switch performs scheduling and congestion control. Scheduling is an algorithm

or process that determines the order in which the queues are processed. The Cisco Catalyst 3560

Series Switch supports shaped round robin (SRR) and strict priority queuing. The SRR algorithm

helps ensure differential prioritization.

These QoS features allow network administrators to prioritize mission-critical and bandwidth-

intensive traffic, such as enterprise resource planning (ERP) (Oracle, etc.), voice (IP telephony

traffic), and computer-aided design (CAD) or computer-aided manufacturing (CAM) over less-time-

sensitive applications such as FTP or e-mail. For example, it would be highly undesirable to have a

large file download destined to one port on a wiring-closet switch and have quality implications

such as increased latency in voice traffic destined to another port on this switch. This condition is

avoided by making sure that voice traffic is properly classified and prioritized throughout the

network. Other applications, such as Web browsing, can be treated as low priority and handled on

a best-effort basis.

The Cisco Catalyst 3560 Series can perform rate limiting through its support of the Cisco

Committed Information Rate (CIR) function. Through CIR, bandwidth can be guaranteed in

increments as low as 8 kbps. Bandwidth can be allocated based on several criteria, including MAC

source address, MAC destination address, IP source address, IP destination address, and TCP or

UDP port number. Bandwidth allocation is essential when network environments require service-

level agreements or when it is necessary for the network manager to control the bandwidth given

to certain users.

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