7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
System Management
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6.2 High Availability
This section describes the high availability (HA) routing options and features that
service providers can use to reduce vulnerability at the network or service provider
edge and alleviate the effect of a lengthy outage on IP networks.
HA is an important feature in service provider routing systems. The unprecedented
growth of IP services and applications in service provider networks is 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. HA 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 advantage of HA routing is evident at the network or service provider edge,
where thousands of connections are hosted. Rerouting options around a failed piece
of equipment are often limited, or, a single access link exists to a customer because
of the additional cost of redundant links. As service providers converge business-
critical services, such as real-time voice (VoIP), video, and VPN applications over
their IP networks, the requirements for HA become more stringent compared to the
requirements for best-effort data.
Network and service availability become critical aspects in advanced IP service
offerings, which dictate that the IP routers used to build the foundations of these
networks must be resilient to component and software outages.
6.2.1 HA Features
As more and more critical commercial applications move to IP networks, providing
HA services becomes increasingly important. This section describes HA features for
7210 SAS devices.
Note: HA with control plane redundancy is only supported on the 7210 SAS-R6 and
7210 SAS-R12. Control plane redundancy is not supported on the 7210 SAS-M,
7210 SAS-Mxp, 7210 SAS-Sx/S 1/10GE, 7210 SAS-Sx 10/100GE, and 7210 SAS-T.
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