Introduction
The Cisco 4000 Series ISRs are modular routers with LAN and WAN connections that can be configured by means of interface modules, including Cisco Enhanced Service Modules (SM-Xs), and Network Interface Modules (NIMs). NIM slots also support removable storage for hosted applications.
The following features are provided for enterprise and service provider applications:
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Enterprise Applications
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High-end branch gateway
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Regional site aggregation
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Key server or PfR primary controller
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Device consolidation or "Rack in a Box"
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Service Provider Applications
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High-end managed services in Customer-Premises Equipment (CPE)
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Services consolidation platform
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Route reflector or shadow router
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Flexible customer edge router
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The router runs Cisco IOS XE software, and uses software components in many separate processes. This modular architecture increases network resiliency, compared to standard Cisco IOS software.