Table of Contents
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Chapter 1
Service Availability
Service Availability Overview
This chapter explains what service availability is and discusses the features of service
availability. It also discusses Juniper Networks multi-layered service availability
approach for uninterrupted delivery of services.
Service Availability Overview on page 3
Understanding Service Availability Features on page 5
In a conventional network, router outages can occur because of denial of service
(DoS) attacks, line module failure, switch route processor module failure, software
defects, feature upgrades, or complete router failure. These outages result in subscriber
downtime.
To reduce subscriber downtime, a network must have the following capabilities:
Reliability A network that does not crash often and recovers from failure very
rapidly. During recovery, the network maintains user sessions and forwards data
with little or no impact on the delivery of services.
Resiliency A network component or network that responds to failure, resists
failure, and handles failure with little or no impact on the delivery of services.
Redundancy A network whose reliability is enhanced by the addition of a backup
component.
High Availability A network that is both reliable and resilient.
JUNOSe Software uses a multi-layered service availability approach that enables you
to provide uninterrupted delivery of services with the help of reliable, highly available,
and redundant hardware and software components.
Service Availability Overview
3
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