Cfc For The Sbx; Overview (Simplex Versus Duplex) - Allied Telesis SwitchBlade x3100 Series Manual

Introduction

1.10.2 CFC for the SBx3112

The following modes and CFCs are available:
For the SBx3112 (200G) the CFC200 supports simplex and duplex mode. Note that in duplex mode, each
CFC200 switches traffic in a load sharing mode thereby doubling the system throughput to 400G. Note that for
this capacity both CFCs must be in service.

1.10.3 Overview (Simplex versus Duplex)

For the SBx3112 in simplex mode there is one Control Module, and it is called the active CFC: it has the only
copy of the configuration database, and if the CFC restarts, service is temporarily lost.
When a SBx3112 is in duplex mode, one of the CFCs is redundant. Because the default for the shelf is Auto-
Prov, the newly inserted CFC is discovered and provisioned and comes up as the inactive CFC. The system is
now equipped with an active and inactive CFC; referred to on the system as ACTCFC and INACTCFC,
respectively, and the inactive keeps a copy of the persistent data and dynamic data, as well as the software load
on the active CFC. Moreover, the inactive receives incremental updates from the active CFC, called data syn-
chronization, or data sync. This ensures there is matching data (called data mirroring) in both CFCs.
Because of this mirroring, the inactive CFC can take over the shelf if there is a fault in the active CFC. This is
called a swap activity or a swap; all persistent and transient data is retained, so the Allied Telesis duplex sys-
tem can continue to process subscriber services as well as receive requests and produce outputs to the man-
agement interfaces, including the alarms associated with the swap.
The above explanation of the SBx3112 in duplex mode assumes that both CFCs are functioning normally prior
to the degradation of the active CFC, that all data and software loads have synched, and that the inactive CFC
has been successfully mirroring data up to the swap and has no alarms. There are situations where these condi-
tions do not exist, and these can be created by the user (such as disabling the inactive CFC), or autonomously.
These will be explained below.
The following shows the output for the SHOW CARD ACTCFC and SHOW CARD INACTCFC commands.
manager SEC>> show card actcfc
--- Card Information ---
Slot............................... 5
Type............................... CFC200
State.............................. UP-UP-Online (Active)
Provisioning Profile............... AutoProv
Hardware
Model Number (Revision)......... AT-SBxMFC (Rev X2)
Serial Number................... 43
CLEI Code....................... <none>
Software
Running Load.................... cfc200_14.2.0.GAMMA.20100722.tar
Preferred Load.................. cfc200_14.2.0.GAMMA.20100722.tar
Temporary Load.................. None
Alternate Load.................. None
Software Build Information
Load File....................... cfc200_14.2.0.GAMMA.20100722.tar
Build Name...................... ATI 200G Central Fabric Controller
Build Type...................... Customer-Release Build
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Software Reference for SwitchBlade x3100 Series Switches (Setting Up the Switch)
CFC for the SBx3112