Alcatel-Lucent 7210 SAS M Configuration Manual page 209

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Component Redundancy
7210 SAS platforms component redundancy is critical to reduce MTTR for the system and
primarily consists of the following features. The following component redundancy is supported
on7210 SAS-R6, 7210 SAS-X, 7210 SAS-M and 7210 SAS-T.
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Service Redundancy on 7210 SAS-R6
All service-related statistics are kept during a switchover. Services, SDPs, and SAPs will remain
up with a minimum loss of forwarded traffic during a CFM/CPM switchover.
Accounting Configuration Redundancy on 7210 SAS-R6
When there is a switchover and the standby CFM/CPM becomes active, the accounting servers
will be checked and if they are administratively up and capable of coming online (media present,
and others), the standby will be brought online and new accounting files will be created at that
point. Users must manually copy the accounting records from the failed CFM/CPM.
7210 SAS M, T, X, R6 Basic System Configuration Guide
Hot standby — The router image, configuration, and network state is already loaded on
the standby and it receives continual updates from the active route processor and the
swapover is immediate. However, hot standby affects conventional router performance as
more frequent synchronization increases consumption of system resources. Newer
generation routers, like the 7210 SAS OS routers, address this issue because they already
have extra processing built into the system.
Redundant power supply — Supports use of 2 power supplies for redundant power
supplies. A power module can be removed without impact on traffic, when redundant
power supplies are in use. The power supply is hot swappable.
Fan module — Failure of one or more fans does not impact traffic. Failure of a single fan
is detected and notified. Fan tray/module is hot-swappable.
→ On 7210 SAS-R6, the fan module/tray contains 6 fans.
→ On 7210 SAS-X, 7210 SAS-M, and 7210 SAS-T devices, the fan module/tray has
3fans.
→ Switch Fabric/Control Processor Module (SF/CPM)— On 7210 SAS-R6, 2 x SF/
CPM can be used to provide control plane redundancy with non-stop routing and non-
stop services. The SF/CPM is hot-swappable.
System Management
Page 209