System Management
7210 SAS M, T, X, R6 Basic System Configuration Guide Page 207
• 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.
Component Redundancy
7210 SAS-Series 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.
• Redundant power supply — A power module can be removed without impact on traffic.
• Fan module — Failure of one or more fans does not impact traffic.
→ On 7210 SAS-X, the fan module/tray contains 3 fans.
→ On 7210 SAS-R6, 7210 SAS-M, and 7210 SAS-T devices, the fan module/tray has 6
fans.
On both these platforms, a failure of a single fan is detected and notified.
• Hot swap — The power supply and fan module are hot swappable.
Service Redundancy
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
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.
Nonstop Forwarding
In a control plane failure or a forced switchover event, the router continues to forward packets
using the existing stale forwarding information. Nonstop forwarding requires clean control plane
and data plane separation. Usually the forwarding information is distributed to the IOMsXCMs/
XMAs.
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