Cisco CATALYST 3560-E Specifications download pdf (Page 6)

Data Sheet

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 ensuring 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.

Management

The new Cisco Express Setup feature simplifies the initial configuration of a switch. Users now

have the option to set up the switch through a Web browser, eliminating the need for more

complex terminal-emulation programs and knowledge of the command-line interface (CLI). Cisco

Express Setup reduces the cost of deployment by helping less-skilled personnel quickly and

simply set

up switches.

Cisco Network Assistant is a PC-based network-management application optimized for LANs

of small and medium-sized businesses with up to 250 users. Cisco Network Assistant offers

centralized management of Cisco switches, routers, and WLAN access points. It supports a wide

range of Cisco Catalyst intelligent switches from Cisco Catalyst 2950 through Cisco Catalyst 4506.

Through a user-friendly GUI, users can configure and manage a wide array of switch functions and

start the device manager of Cisco routers and Cisco wireless access points. A few mouse clicks

enable the Cisco recommended security, availability, and QoS features without the need to consult

a detailed design guide. The Security wizard automatically restricts unauthorized access to servers

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Cisco CATALYST 3560-E Specifications Page 6

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