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Understanding Service Availability Features
Service availability refers to ability of a network or a network component to provide
uninterrupted delivery of services using highly available, redundant, and reliable
components. This topic provides brief overviews of the benefits of using the following
service availability features:
Module Redundancy
For hardware components, Juniper Networks provides redundancy solutions to ensure
that the router continues to operate in the event of a hardware fault. Redundancy
also enables you to hot-swap various components within your E Series router.
Stateful SRP Switchover
Stateful SRP switchover (high availability) enables you to reduce or eliminate single
points of failure in your network. Stateful SRP switchover provides both
hardware-specific and software-specific methods to ensure minimal downtime and
ultimately improve the performance of your network.
Stateful SRP switchover minimizes the impact to the router of a stateful switchover
from the active SRP module to the standby SRP module. Stateful SRP switchover
maintains user sessions and data forwarding through the router during the switchover,
thus improving the overall availability of the router.
Unified ISSU
A conventional software upgrade one that does not use the unified in-service
software upgrade (ISSU) process causes a router-wide outage for all users. Only
static configurations (stored on the flash card) are maintained across the upgrade;
all dynamic configurations are lost. A conventional upgrade can take 30-40 minutes
to complete, with additional time required to bring all users back online.
Unified ISSU enables you to upgrade the router to a higher-numbered software release
without disconnecting user sessions or disrupting forwarding through the chassis.
When an application supports unified ISSU, you can configure the application on the
router and proceed with the unified in-service software upgrade with no adverse
effect on the upgrade.
Understanding Service Availability Features on page 5
Module Redundancy on page 5
Stateful SRP Switchover on page 5
Unified ISSU on page 5
VRRP on page 6
Interchassis Redundancy on page 6
Chapter 1: Service Availability
Understanding Service Availability Features
5
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