Configuring RSVP Graceful Restart
The following RSVP graceful restart configurations are possible:
- Graceful restart and helper mode are both enabled (the default).
- Graceful restart is enabled but helper mode is disabled. A router configured in this way can restart gracefully, but cannot help a neighbor with its restart and recovery procedures.
- Graceful restart is disabled but helper mode is enabled. A router configured in this way cannot restart gracefully, but can help a restarting neighbor.
- Graceful restart and helper mode both are disabled. This configuration completely disables RSVP graceful restart (including restart and recovery procedures and helper mode). The router behaves like a router that does not support RSVP graceful restart.
 | Note: In order to turn on RSVP graceful restart, you must set the global graceful restart timer to at least 180 seconds. |
The following sections describe how to configure RSVP graceful restart:
Enabling Graceful Restart for All Routing Protocols
To enable graceful restart for RSVP, you need to enable graceful restart for all the protocols that support graceful restart on the router. For more information about graceful restart, see the Junos OS Routing Protocols Configuration Guide.
To enable graceful restart on the router, include the graceful-restart statement:
You can include this statement at the following hierarchy levels:
- [edit routing-options]
- [edit logical-systems logical-system-name routing-options]
Disabling Graceful Restart for RSVP
By default, RSVP graceful restart and RSVP helper mode are enabled when you enable graceful restart. However, you can disable one or both of these capabilities.
To disable RSVP graceful restart and recovery, include the disable statement at the [edit protocols rsvp graceful-restart] hierarchy level:
Disabling RSVP Helper Mode
To disable RSVP helper mode, include the helper-disable statement at the [edit protocols rsvp graceful-restart] hierarchy level:
Configuring the Maximum Helper Recovery Time
To configure the amount of time the router retains the state of its RSVP neighbors while they undergo a graceful restart, include the maximum-helper-recovery-time statement at the [edit protocols rsvp graceful-restart] hierarchy level. This value is applied to all neighboring routers, so it should be based on the time required by the slowest RSVP neighbor to recover.
Configuring the Maximum Helper Restart Time
To configure the delay between when the router discovers that a neighboring router has gone down and when it declares the neighbor down, include the maximum-helper-restart-time statement at the [edit protocols rsvp graceful-restart] hierarchy level. This value is applied to all neighboring routers, so it should be based on the time required by the slowest RSVP neighbor to restart.
