Cisco Systems A9K24X10GETR manual Cisco IOS XR Software, Simple Network Management Protocol, page

Chapter 1 Introducing to the Cisco ASR 9000 Series Aggregation Services Router

Router Overview

F I N A L D R A F T — C i s c o C o n f i d e n t i a l

•Multicast, page 1-4

•OAM, page 1-4

•Layer 3 routing, page 1-5

•QoS, page 1-5

•MPLS TE, page 1-5

•Manageability, page 1-8

•Security, page 1-9

•Command-Line Interface, page 1-10

•Extensible Markup Language API, page 1-10

•Simple Network Management Protocol, page 1-10

Cisco IOS XR Software

The router runs Cisco IOS XR Software, this offers the following:

•Modular software design: Cisco IOS XR Software represents a continuation of the Cisco networking leadership in helping customers realize the power of their networks and the Internet. It provides unprecedented routing-system scalability, high availability, service isolation, and manageability to meet the mission-critical requirements of next-generation networks.

•Operating system infrastructure protection: Cisco IOS XR Software provides a microkernel architecture that forces all but the most critical functions, such as memory management and thread distribution, outside of the kernel, thereby preventing failures in applications, file systems, and even device drivers from causing widespread service disruption.

•Process and thread protection: Each process—even individual process threads—is executed in its own protected memory space, and communications between processes are accomplished through well-defined, secure, and version-controlled application programming interfaces (APIs), significantly minimizing the effect that any process failure can have on other processes.

•Cisco In-Service Software Upgrade (ISSU): Cisco IOS XR Software modularity sustains system availability during installation of a software upgrade. ISSUs or hitless software upgrades (HSUs) allow you to upgrade most Cisco router software features without affecting deployed services. You can target particular system components for upgrades based on software packages or composites that group selected features. Cisco preconfigures and tests these packages and composites to help ensure system compatibility.

•Process restart: You can restart critical control-plane processes both manually and automatically in response to a process failure versus restarting the entire operating system. This feature supports the Cisco IOS XR Software goal of continuous system availability and allows for quick recovery from process or protocol failures with minimal disruption to customers or traffic.

•State checkpointing: You can maintain a memory and critical operating state across process restarts in order to sustain routing adjacencies and signaling state during a route-switch-processor (RSP) switchover.

•Ethernet virtual connections (EVCs): Ethernet services are supported using individual EVCs to carry traffic belonging to a specific service type or end user through the network. You can use EVC-based services in conjunction with MPLS-based L2VPNs and native IEEE bridging deployments.

Cisco ASR 9000 Series Aggregation Services Router Getting Started Guide

1-2 OL-17502-01