Ioa Behavior When The Router Reboots; Line Module Behavior When Disabling Or Enabling Ioas; Managing Module Redundancy - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SERVICE AVAILABILITY CONFIGURATION GUIDE 2010-10-08 Configuration Manual

Related
Documentation
Copyright © 2010, Juniper Networks, Inc.
functionality when an ES2-S1 Redund IOA is located directly behind it. When the line
module does not contain an ES2-S1 Redund IOA, it is considered a primary line module.
The router accepts the following redundancy groups:
ES2 4G LM as backup and ES2 4G LM as primary
ES2 10G Uplink LM and ES2 10G Uplink LM as primary
ES2 10G LM as backup and ES2 10G LM
ES2 10G ADV LM as backup and ES2 10G ADV LM as primary
ES2 10G ADV LM as backup and ES2 10G LM as primary
Also, you cannot configure stateless switchover redundancy for the ES2-S1 Service IOA.

IOA Behavior When the Router Reboots

On E120 and E320 routers, stateless switchover is based on the combined states of the
line module and the IOAs that are installed in the affected slot.
When the router reboots and the formerly configured primary line module is not present,
or is present and fails diagnostics, it switches to a spare line module and takes inventory
of the IOAs. If the IOA is present and new, the router reverts back to the primary line
module so that the spare line module can service other active primary line modules.
When the router reboots and a slot contains a line module and one active and one inactive
IOA, the inactive IOA remains in that state.

Line Module Behavior When Disabling or Enabling IOAs

On E120 and E320 routers, a line module reboots when you issue the adapter disable
or adapter enable commands for an associated IOA.
When you issue the adapter disable or adapter enable commands, the line module
(primary or spare) currently associated with that IOA reboots. If the IOA is protected by
a line module redundancy group, an automatic line module redundancy switchover or
revert can be triggered by the line module reboot. To prevent undesired line module
redundancy actions, issue the redundancy lockout command for the primary line module
slot before issuing the adapter disable or adapter enable commands.
Line Module Redundancy Overview on page 9
Configuring Line Module Redundancy on page 13
Managing Line Module Redundancy on page 13
Stateful Line Module Switchover Overview on page 68
Stateful Line Module Switchover Platform Considerations on page 70
Chapter 2: Managing Module Redundancy
11