Effects Of A Routing Engine Switchover; Table 3: Effects Of A Routing Engine Switchover - Juniper EX9200 Features Manual

High Availability Feature Guide for EX9200 Switches

Effects of a Routing Engine Switchover

Table 3: Effects of a Routing Engine Switchover

Feature
Dual Routing Engines only (no features
enabled)
GRES enabled
GRES and nonstop active routing
enabled
8
Table 3 on page 8 describes the effects of a Routing Engine switchover when different
features are enabled:
No high availability features
Graceful Routing Engine switchover
Graceful restart
Nonstop active routing
Benefits
When the switchover to the new
master Routing Engine is complete,
routing convergence takes place and
traffic is resumed.
During the switchover, interface and
kernel information is preserved.
The switchover is faster because the
Packet Forwarding Engines are not
restarted.
Traffic is not interrupted during the
switchover.
Interface and kernel information are
preserved.
Considerations
All physical interfaces are taken
offline.
Packet Forwarding Engines restart.
The backup Routing Engine restarts
the routing protocol process (rpd).
All hardware and interfaces are
discovered by the new master Routing
Engine.
The switchover takes several minutes.
All of the router's adjacencies are
aware of the physical (interface
alarms) and routing (topology)
changes.
The new master Routing Engine
restarts the routing protocol process
(rpd).
All hardware and interfaces are
acquired by a process that is similar
to a warm restart.
All adjacencies are aware of the
router's change in state.
Unsupported protocols must be
refreshed using the normal recovery
mechanisms inherent in each protocol.
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