Cisco WS-C3750-48PS-S Software Configuration Manual page 54

Network Configuration Examples
Table 1-2 Providing Network Services (continued)
Network Demands
An evolving demand for IP telephony
A growing demand for using existing
infrastructure to transport data and
voice from a home or office to the
Internet or an intranet at higher
speeds
You can use the switches and switch stacks to create the following:
•
Figure 1-1
Gigabit
server
•
Catalyst 3750 Switch Software Configuration Guide
1-14
Suggested Design Methods
Use QoS to prioritize applications such as IP telephony during congestion and to
•
help control both delay and jitter within the network.
• Use switches that support at least two queues per port to prioritize voice and data
traffic as either high- or low-priority, based on 802.1p/Q. The Catalyst 3750
switch supports at least four queues per port.
• Use voice VLAN IDs (VVIDs) to provide separate VLANs for voice traffic.
Use the Catalyst Long-Reach Ethernet (LRE) switches to provide up to 15 Mb of IP
connectivity over existing infrastructure, such as existing telephone lines.
LRE is the technology used in the Catalyst 2900 LRE XL and Catalyst 2950
Note
LRE switches. Refer to the documentation sets specific to these switches for
LRE information.
Cost-effective wiring closet
closet is to have a switch stack of up to nine Catalyst 3750 switches. To preserve switch connectivity
if one switch in the stack fails, connect the switches as recommended in the hardware installation
guide, and enable either cross-stack Etherchannel or cross-stack UplinkFast.
You can have redundant uplink connections, using SFP modules in the switch stack to a Gigabit
backbone switch, such as a Catalyst 4500 or Catalyst 3750-12S Gigabit switch. You can also create
backup paths by using Fast Ethernet, Gigabit, or EtherChannel links. If one of the redundant
connections fails, the other can serve as a backup path. If the Gigabit switch is cluster-capable, you
can configure it and the switch stack as a switch cluster to manage them through a single IP address.
The Gigabit switch can be connected to a Gigabit server through a 1000BASE-T connection.
Cost-Effective Wiring Closet
Catalyst
Gigabit Ethernet
multilayer switch
Si
High-performance wiring closet
use Catalyst 3750 switches and switch stacks in the access layer to provide Gigabit Ethernet to the
desktop. To prevent congestion, use QoS DSCP marking priorities on these switches. For high-speed
(Figure 1-1)—A cost-effective way to connect many users to the wiring
(Figure 1-2)—For high-speed access to network resources, you can
Chapter 1
Catalyst 3750
Layer 2
StackWise
switch stack
Overview
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