7210 SAS-MXP, R6, R12, S, SX, T BASIC SYSTEM
CONFIGURATION GUIDE RELEASE 22.9.R1
System management
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.
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-Mxp, 7210 SAS-Sx/S 1/10GE,
7210 SAS-Sx 10/100GE, and 7210 SAS-T.
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.
6.2.1.1 Redundancy
Redundancy features enable duplication of data elements to maintain service continuation in case of
outages or component failure.
6.2.1.1.1 Software redundancy on 7210 SAS-R6 and 7210 SAS-R12
Software outages are challenging even when baseline hardware redundancy is in place. A balance
should be maintained when providing HA routing, otherwise router problems typically propagate not only
throughout the service provider network, but also externally to other connected networks that potentially
belong to other service providers. This could affect customers on a broad scale. The 7210 SAS-R6 and
7210 SAS-R12 devices support several software availability features that contribute to the percentage of
time that a router is available to process and forward traffic.
All routing protocols specify minimum time intervals in which the peer device must receive an
acknowledgment before it disconnects the session:
3HE 18197 AAAB TQZZA
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