Juniper E-Series Installation And User Manual page 40

1-18 CHAPTER 1
E-Series Overview
The process by which the system switches to the spare line module is
called switchover. When switchover occurs, the system:
1
Breaks the connection between the primary I/O module and the
primary line module.
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 spare line module.
Figure 1-15 shows the data flow when a spare line module becomes
active.
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Figure 1-15 Data flow when a spare line module is active
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