Figure 4: Nonstop Bridging During A Switchover - Juniper EX9200 Features Manual

Chapter 4: Understanding How Nonstop Bridging Preserves Layer 2 Protocol Information During a Routing Engine Switchover
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Figure 4: Nonstop Bridging During a Switchover

The switchover process follows these steps:
When keepalives from the master Routing Engine are lost, the system switches over
1.
gracefully to the backup Routing Engine.
The Packet Forwarding Engine connects to the backup Routing Engine, which becomes
2.
the new master. Because the Layer 2 Control Protocol process (l2cpd) and chassis
process (chassisd) are already running, these processes do not need to restart.
State information learned from the point of the switchover is updated in the system.
3.
Forwarding and bridging are continued during the switchover, resulting in minimal
packet loss.
Understanding High Availability Features on Juniper Networks Routers
Nonstop Bridging System Requirements on page 29
Configuring Nonstop Bridging on page 31
Configuring Nonstop Bridging on Switches (CLI Procedure)
27