Graceful Restart For Aggregate And Static Routes; Graceful Restart And Routing Protocols - Juniper EX9200 Features Manual

High Availability Feature Guide for EX9200 Switches
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Graceful Restart for Aggregate and Static Routes

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Graceful Restart and Routing Protocols

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Graceful restart works similarly for routing protocols and MPLS protocols and combines
components of these protocol types to enable graceful restart in VPNs. The main benefits
of graceful restart are uninterrupted packet forwarding and temporary suppression of
all routing protocol updates. Graceful restart thus enables a router to pass through
intermediate convergence states that are hidden from the rest of the network.
Most graceful restart implementations define two types of routers-the restarting router
and the helper router. The restarting router requires rapid restoration of forwarding state
information so it can resume the forwarding of network traffic. The helper router assists
the restarting router in this process. Graceful restart configuration statements typically
affect either the restarting router or the helper router.
Understanding High Availability Features on Juniper Networks Routers
Graceful Restart System Requirements on page 73
Graceful Restart for Aggregate and Static Routes on page 66
Graceful Restart and Routing Protocols on page 66
Graceful Restart and MPLS-Related Protocols on page 69
Graceful Restart and Layer 2 and Layer 3 VPNs on page 70
Graceful Restart on Logical Systems on page 71
Configuring Graceful Restart on page 87
Configuring Graceful Restart for QFabric Systems
When you include the graceful-restart
level, any static routes or aggregated routes that have been configured are protected.
Because no helper router assists in the restart, these routes are retained in the forwarding
table while the router restarts (rather than being discarded or refreshed).
Graceful Restart Concepts on page 65
Graceful Restart System Requirements on page 73
Enabling Graceful Restart on page 75
Verifying Graceful Restart Operation on page 220
Configuring Graceful Restart on page 87
This section covers the following topics:
BGP on page 67
IS-IS on page 67
OSPF and OSPFv3 on page 67
statement at the [edit routing-options]
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