Figure 3: Nonstop Bridging Switchover Preparation Process - Juniper EX9200 Features Manual

High Availability Feature Guide for EX9200 Switches
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Figure 3: Nonstop Bridging Switchover Preparation Process

The switchover preparation process for nonstop bridging follows these steps:
The master Routing Engine starts.
1.
The routing platform processes on the master Routing Engine (such as the chassis
2.
process [chassisd] and the Layer 2 Control Protocol process [l2cpd]) start.
The Packet Forwarding Engine starts and connects to the master Routing Engine.
3.
All state information is updated in the system.
4.
The backup Routing Engine starts, including the chassis process (chassisd) and the
5.
Layer 2 Control Protocol process (l2cpd).
The system determines whether graceful Routing Engine switchover and nonstop
6.
bridging have been enabled.
The kernel synchronization process (ksyncd) synchronizes the backup Routing Engine
7.
with the master Routing Engine.
For supported protocols, state information is updated directly between the l2cpds on
8.
the master and backup Routing Engines.
Figure 4 on page 27 shows the effects of a switchover on the routing platform.
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