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CHAPTER 1
Service Availability
Service Availability Overview
Copyright © 2010, Juniper Networks, Inc.
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.
Figure 1 illustrates the multiple layers of JunosE Software service availability.
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