System Management
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Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
6.2 High Availability
This section discusses the high availability routing options and features available to
service providers that help diminish vulnerability at the network or service provider
edge and alleviate the effect of a lengthy outage on IP/MPLS networks.
High availability is an important feature in service provider routing and switching
systems. High availability is gaining momentum due to the unprecedented growth of
IP/MPLS services and applications in service provider networks driven by the
demand from the enterprise and residential communities. Downtime can be very
costly, and, in addition to lost revenue, customer information and business-critical
communications can be lost. High availability is the combination of continuous
uptime over long periods (Mean Time Between Failures (MTBF)) and the speed at
which failover or recovery occurs (Mean Time To Repair (MTTR)).
The popularity of high availability routing is evident at the network or service provider
edge where thousands of connections are hosted and rerouting options around a
failed piece of equipment can often be limiting. Or, a single access link exists to a
customer because of additional costs for redundant links. As service providers
converge business-critical services such as real-time voice (VoIP), video, and VPN
applications over their IP/MPLS networks, high availability becomes much more
stringent compared to the requirements for best-effort data.
Network and service availability become critical aspects when offering advanced IP/
MPLS services, which dictate that IP routers that are used to construct the
foundations of these networks be resilient to component and software outages.
For high availability configuration information, see CSM Synchronization and
Redundancy.
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