graceful-restart no-impact-holdtime
Function
The graceful-restart no-impact-holdtime command configures the holdtime of an IS-IS neighbor to remain unchanged after IS-IS GR is enabled.
The undo graceful-restart no-impact-holdtime command cancels the configuration.
By default, the holdtime of an IS-IS neighbor becomes 300 seconds after IS-IS GR is enabled.
Usage Guidelines
Usage Scenario
If IS-IS GR is enabled on a router, the holdtime of this router's neighbors is automatically changed to 300s. If a router is faulty in non-GR scenarios, its neighbors need to take 300 seconds to detect the fault. A large number of packets may be discarded within the 60 seconds.
To resolve this problem, run the graceful-restart no-impact-holdtime command to configure the holdtime of the neighbors to remain unchanged after IS-IS GR is enabled. After you run this command, the router can still fast detect neighbor status, implementing rapid network convergence.
Prerequisites
You have run the graceful-restart (IS-IS) command in the IS-IS view.
