Cisco Systems NME-16ES-1G manual Cost-Effective Wiring Closet

Cisco EtherSwitch Service Modules Feature Guide

Network Configuration Examples

Table 6	Providing Network Services (continued)
Network Demands		Suggested Design Methods
High demand on network redundancy		• Use switch stacks, where all stack members are eligible stack masters in case of
and availability to provide always on		stack master failure. All stack members have synchronized copies of the saved and
mission-critical applications		running configuration files of the switch stack.
		• Cross-stack EtherChannel for providing redundant links across the switch stack.
		• Use Hot Standby Router Protocol (HSRP) for cluster command EtherSwitch
		service module and router redundancy.
		• Use VLAN trunks, cross-stack UplinkFast, and BackboneFast for traffic-load
		balancing on the uplink ports so that the uplink port with a lower relative port cost
		is selected to carry the VLAN traffic.
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 internal interfaces 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
		Cisco EtherSwitch service module supports at least four queues per port.
		• Use voice VLAN IDs (VVIDs) to provide separate VLANs for voice traffic.

You can use the Cisco EtherSwitch service modules and switch stacks to create the following:

•Cost-effective wiring closet (Figure 8)—A cost-effective way to connect many users to the wiring closet is to have a switch stack of up to nine Cisco EtherSwitch service modules. To preserve switch connectivity if one EtherSwitch service module in the stack fails, connect the switches and enable either cross-stack EtherChannel or cross-stack UplinkFast.

You can have redundant uplink connections, using small form-factor pluggable (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 Ethernet, or EtherChannel links. If one of the redundant connections fails, the other can serve as a backup path.

Figure 8	Cost-Effective Wiring Closet
	Cisco integrated services
Gigabit	router with EtherSwitch
	service module
server
	Cisco integrated
	services router
	with EtherSwitch
	service module

Catalyst 3750 Layer 2 StackWise switch stack

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