Cisco Systems NME-16ES-1G manual Redundant Gigabit Backbone

Cisco EtherSwitch Service Modules Feature Guide

Network Configuration Examples

•Redundant gigabit backbone (Figure 9)—Using HSRP, you can create backup paths between two Cisco EtherSwitch service modules to enhance network reliability and load balancing for different VLANs and subnets. Using HSRP also provides faster network convergence if any network failure occurs. You can connect the Catalyst switches, again in a star configuration, to two

Cisco EtherSwitch service modules. If one of the backbone Cisco EtherSwitch service modules fails, the second backbone Cisco EtherSwitch service module preserves connectivity between the switches and network resources.

Figure 9	Redundant Gigabit Backbone
Cisco integrated services		Cisco integrated services
router with EtherSwitch		router with EtherSwitch
service module		service module
	1-Gbps HSRP

Catalyst switches

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•High-performance wiring closet (Figure 10)—For high-speed access to network resources, you can use Cisco EtherSwitch service modules 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 IP forwarding at the distribution layer, connect the switches in the access layer to a gigabit multilayer switch in the backbone, such as a Catalyst 4500 gigabit switch or Catalyst 6500 gigabit switch.

Each Cisco EtherSwitch service module in this configuration provides users with a dedicated

1-Gbps connection to network resources. Using SFP service modules also provides flexibility in media and distance options through fiber-optic connections.

Cisco IOS Release 12.2(25)SEC

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