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CHAPTER 4
Managing Stateful Line Module
Switchover
Copyright © 2010, Juniper Networks, Inc.
This chapter describes how to manage stateful line module switchover (high availability)
software features for E120 and E320 routers, and contains the following sections:
Stateful Line Module Switchover Overview on page 68
Benefits of Stateful Line Module Switchover on page 68
Stateful Line Module Switchover Platform Considerations on page 70
Guidelines for Configuring Stateful Line Module Switchover on page 70
System Operations When Stateful Line Module Switchover Is Enabled on page 74
Stateful Line Module Configuration Scenarios on page 75
Replacement of Line Modules When Stateful Line Module Switchover Is
Enabled on page 77
Application Support for Stateful Line Module Switchover on page 79
Stateful Line Module Switchover Modes on page 83
Stateful Line Module Switchover States on page 84
Guidelines for Activating High Availability on page 87
Activating High Availability on page 88
Guidelines for Deactivating High Availability on page 89
Deactivating High Availability on page 89
Switching Over from a Primary Line Module to Secondary Line Module on page 90
Log Messages Generated for Stateful LM Switchover on page 91
Preservation of Statistics During Stateful Line Module Switchover on page 93
Performance Impact and Scalability Considerations on page 94
Use of Status LEDs to Monitor the High Availability States of Line Modules on page 95
Monitoring the Redundancy Status of Line Modules in a Specific Slot on page 95
Monitoring the Redundancy History of Line Modules in a Specific Slot on page 97
67
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