Graceful Restart On Logical Systems - Juniper EX9200 Features Manual

Chapter 10: Understanding How Graceful Restart Enables Uninterrupted Packet Forwarding When a Router Is Restarted
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Graceful Restart on Logical Systems

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Copyright © 2017, Juniper Networks, Inc.
Before VPN graceful restart can work properly, all of the components must restart
gracefully. In other words, the routers must preserve their forwarding states and request
neighbors to continue forwarding to the router in case of a restart. If all of the conditions
are satisfied, VPN graceful restart imposes the following rules on a restarting router:
The router must wait to receive all BGP NLRI information from other PE routers before
advertising routes to the CE routers.
The router must wait for all protocols in all routing instances to converge (or complete
the restart process) before it sends CE router information to other PE routers. In other
words, the router must wait for all instance information (whether derived from local
configuration or advertisements received from a remote peer) to be processed before
it sends this information to other PE routers.
The router must preserve all forwarding state in the
new labels and transit routes are allocated and announced to other PE routers (and
CE routers in a carrier-of-carriers scenario).
If any condition is not met, VPN graceful restart does not succeed in providing
uninterrupted forwarding between CE routers across the VPN infrastructure.
Graceful Restart Concepts on page 65
Graceful Restart System Requirements on page 73
Configuring Logical System Graceful Restart on page 86
Verifying Graceful Restart Operation on page 220
Configuring Graceful Restart on page 87
Graceful restart for a logical system functions much as graceful restart does in the main
router. The only difference is the location of the
For a logical system, include the
logical-system-name routing-options]
For a routing instance inside a logical system, include the
at both the [edit logical-systems logical-system-name routing-options]
logical-systems logical-system-name routing-instances instance-name routing-options]
hierarchy levels.
Graceful Restart Concepts on page 65
Graceful Restart System Requirements on page 73
Configuring Logical System Graceful Restart on page 86
Verifying Graceful Restart Operation on page 220
Configuring Graceful Restart on page 87
instance.mpls.0
graceful-restart
graceful-restart statement at the
hierarchy level.
graceful-restart
tables until the
statement:
[edit logical-systems
statement
and [edit
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