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ERX 8.0.x Hardware Guide
of iden tical line modu les provides redundancy in case of line module
failure . To us
e this feature, you need a:
Spare line mod
ule
Redundancy mi
dplane
Redundancy I/
O module
Aredundancym
idplane can cover 3–6 slots. It provides additional connectivity that
enablesthesparelinemoduletotakecontroloftheI/Omoduleassociatedwith
any failed line module in the redundancy group. The spa re I/O module provides
connectivit
y from the spare line module to the redundancy midplane.
The process b
y which the system switches to the spare line m odule is called
switchover . When switchover occurs, the system:
1. BreakstheconnectionbetweentheprimaryI/Omoduleandtheprimary
line modu le.
2. Connects the primary I/O module to the spare line module via the redundancy
midplane and redundancy I/O module.
Protocol processing then takes place on the sp are line module.
Figure 12 shows the data flow when a spare line mod u le be comes active.
18 Redundancy Features