Configuring VPN Graceful Restart
Graceful restart allows a router whose VPN control plane is undergoing a restart to continue to forward traffic while recovering its state from neighboring routers. Without graceful restart, a control plane restart disrupts any VPN services provided by the router. Graceful restart is supported on Layer 2 VPNs, Layer 3 VPNs, virtual-router routing instances, and VPLS.
To implement graceful restart for a Layer 2 VPN or Layer 3 VPN, perform the configuration tasks described in the following sections:
Configuring Graceful Restart for the Routing Instance
For Layer 3 VPNs only, you must also configure graceful
restart for all routing and MPLS-related protocols within a routing
instance by including the graceful-restart statement at
the [edit routing-instances instance-name routing-options] hierarchy level. Because you can configure
multi-instance BGP and multi-instance LDP, graceful restart for a
carrier-of-carriers scenario is supported. To configure the duration
of the graceful restart period for the routing instance, include the restart-duration statement at the [edit routing-instances instance-name routing-options].
[edit]
routing-instances {
instance-name {
routing-options {
graceful-restart {
disable;
restart-duration seconds;
}
}
}
}
You can disable graceful restart for individual protocols with
the disable statement at the [edit routing-instances instance-name protocols protocol-name graceful-restart] hierarchy level.