Cisco Systems 3750E manual Cost-Effective Wiring Closet

Chapter 1 Overview

Network Configuration Examples

Table 1-2	Providing Network Services (continued)
Network Demands		Suggested Design Methods
An evolving demand for IP telephony		• 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 IEEE 802.1p/Q. The switch
		supports at least four queues per port.
		• Use voice VLAN IDs (VVIDs) to provide separate VLANs for voice traffic.
A growing demand for using existing		Use the Catalyst Long-Reach Ethernet (LRE) switches to provide up to 15 Mb of IP
infrastructure to transport data and		connectivity over existing infrastructure, such as existing telephone lines.
voice from a home or office to the		Note LRE is the technology used in the Catalyst 2950 LRE switch. See the
Internet or an intranet at higher
		documentation sets specific to this switch for LRE information.
speeds

You can use the switches and switch stacks to create the following:

•Cost-effective wiring closet (Figure 1-1)—A cost-effective way to connect many users to the wiring closet is to have a switch stack of up to nine Catalyst 3750-E 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-E switch. You can also create backup paths by using 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.

Figure 1-1 Cost-Effective Wiring Closet

	Catalyst
Gigabit	Gigabit Ethernet
server	multilayer switch
	Si

Catalyst 3750-E Layer 2 StackWise Plus switch stack

200851

•High-performance wiring closet (Figure 1-2)—For high-speed access to network resources, you can use Catalyst 3750-E switches and switch stacks in the access layer to provide Gigabit Ethernet access to the desktop. To prevent congestion, use QoS DSCP marking priorities on these switches.

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

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