Chapter 3 High Availability And Redundant Operation; Features Overview; High Availability Router Operations; Stateful Switchover - Cisco ASR 9000 series Reference Manual

High Availability and Redundant Operation
This chapter describes the high availability and redundancy features of the
Cisco ASR 9000 Series Aggregation Services Routers.

Features Overview

The Cisco ASR 9000 Series Routers are designed to have high Mean Time Between Failures (MTBF)
and low Mean Time To Resolve (MTTR) rates, thus providing a reliable platform that minimizes outages
or downtime and maximizes availability.
In addition, the Cisco ASR 9000 Series offers the following high availability (HA) features to enhance
network level resiliency and enable network-wide protection:
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High Availability Router Operations

The Cisco ASR 9000 Series offers a variety of hardware and software high availability features.

Stateful Switchover

The Route Switch Processor (RSP) cards are deployed in "active/standby" configurations. Stateful
switchover (SSO) preserves state and configuration information in the event of a switchover to the
standby RSP card. The standby RSP card has a mirror image of the state of protocols, users
configuration, interface state, subscriber state, system state and other parameters. Should a hardware or
software failure occur in the active RSP card, the standby RSP card changes state to become the active
RSP card. This stateful switchover has no impact in forwarding traffic.
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D R A F T — C I S C O C O N F I D E N T I A L
High Availability Router Operations
Stateful Switchover
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Fabric Failover
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Non-Stop Forwarding
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Process Restartability
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Fault Detection and Management
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Power Supply Redundancy
Cooling System Redundancy
Cisco ASR 9000 Aggregation Services Router Overview and Reference Guide
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