Redundant Cfc Operation In The Sbx; Provisioning Scenarios For Control Modules - Allied Telesis SwitchBlade x3100 Series Manual

Introduction
State continue to be DOWN, since the card cannot provide service yet. Once data sync is complete, the
inactive card states change to normal:
Admin State - UP, since the card now is synched to the active CFC and is enabled.
2.
Status - IN TEST, since the inactive CFC is running diagnostics on itself to ensure it has no faults and is
3.
ready to go into service
Operational State - UP, since the CFC will now be able to take over the shelf if it can sync with the
4.
active CFC and has no faults.
Whenever the inactive CFC reboots, it assumes that the active CFC is functioning normally during the
Note:
reboot process; this ensures the inactive will not come up as the newly active CFC if the currently
active CFC were to fail during the reboot. Moreover, in assuming the active CFC is functioning
normally during the reboot, the inactive CFC will wait for the active CFC to establish communications
and begin the data sync. However, if the inactive card detects that the active card is no longer
providing service (rebooting, failed, removed), the inactive card will start a 5 minute timer. If the timer
expires, the inactive CFC will try to come into service as the active using its own (possibly not
current) data.

1.10.6 Redundant CFC Operation in the SBx3112

The SBx3112 duplex configuration each CFC200 switches traffic in a load sharing mode thereby doubling the
system throughput to 400G.
Audits are performed after a switchover, to ensure that the CFC and Line Cards are in sync. There is the
potential for the cards to be out of sync if, for example, a change to the mirroring was in progress during the
switchover.
For full packet throughput both CFCs must be installed and operational. The CFCs will provide a level of
redundancy allowing the system to survive one of the CFCs being removed, although with a reduction to half
the backplane bandwidth.
The system will still switch at full duplex capacity (400Gbps) whenever both CFCs are in sync during software
upgrade, where one of the CFCs is in upgrade mode. However, during the restart of the CFC for loading the
new software, there will be a reduction in backplane bandwidth since that CFC is temporarily not providing
service.

1.10.7 Provisioning Scenarios for Control Modules

1.10.7.1 Overview
The following procedures are used when changing the SBx3112 mode from simplex to duplex (one always
active CFC to an active and inactive CFC) or duplex to simplex (an active and inactive CFC to only one always
active CFC). Both types of procedures can be done in AutoProv or Manual mode.
To minimize the possibility of loss of service, all procedures to change the CFC configuration involve
Note:
inserting or removing the inactive CFC. Ensure that all of the commands used in this section apply to
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Software Reference for SwitchBlade x3100 Series Switches (Setting Up the Switch)
Redundant CFC Operation in the SBx3112