Juniper-networks E-Series Uživatelský manuál stáhnout pdf (Strana 40)

CHAPTER 1

E-Series Overview

1-18

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.

Figure 1-15 Data flow when a spare line module is active

Midplane





Redundancy

midplane

Spare line module

Primary line module

Redundancy

I/O module

Primary

I/O module





1. A packet arrives at the primary I/O module.

2. The packet passes along the redundancy

midplane from the primary I/O module to

the redundancy I/O module.

3. The packet passes from the redundancy

I/O module to the spare line module.

4. The spare line module processes the packet.

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Juniper-networks E-Series Uživatelský manuál Strana 40