Cisco Catalyst 3560-X Software Configuration Manual page 73

Chapter 1 Overview
In addition to inter-VLAN routing, the multilayer switches provide QoS mechanisms such as DSCP
priorities to prioritize the different types of network traffic and to deliver high-priority traffic. If
congestion occurs, QoS drops low-priority traffic to allow delivery of high-priority traffic.
For prestandard and IEEE 802.3af-compliant powered devices connected to Catalyst PoE switches,
IEEE 802.1p/Q QoS gives voice traffic forwarding-priority over data traffic.
Catalyst PoE switch ports automatically detect any Cisco prestandard and IEEE 802.3af-compliant
powered devices that are connected. Each PoE switch port provides 15.4 W of power per port. The
powered device, such as a Cisco IP Phone, can receive redundant power when it is also connected to an
AC power source. Powered devices not connected to Catalyst PoE switches must be connected to AC
power sources to receive power.
Cisco CallManager controls call processing, routing, and Cisco IP Phone features and configuration.
Users with workstations running Cisco SoftPhone software can place, receive, and control calls from
their PCs. Using Cisco IP Phones, Cisco CallManager software, and Cisco SoftPhone software integrates
telephony and IP networks, and the IP network supports both voice and data.
With the multilayer switches providing inter-VLAN routing and other network services, the routers
focus on firewall services, Network Address Translation (NAT) services, voice-over-IP (VoIP) gateway
services, and WAN and Internet access.
Figure 1-7
StackWise Plus
switch stack
OL-25303-03
Catalyst 3750-X-Only Switch Stack in a Collapsed Backbone Configuration
Internet
Cisco 2600 or
3700 routers
IP IP
Cisco IP
Workstations
phones
running
Cisco SoftPhone
software
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
Network Configuration Examples
Aironet wireless
access points
Gigabit
servers
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