If an IS-IS device needs to be temporarily isolated, configure the overload state for it to prevent other devices from forwarding traffic to this IS-IS device and prevent routing black holes.
If an IS-IS device needs to be temporarily isolated, for upgrade or maintenance purposes for example, configure the overload state for it so that no other devices will forward traffic to this IS-IS device.
IS-IS routes converge more quickly than BGP routes do. To prevent routing black holes on a network where both IS-IS and BGP are configured, set an overload bit to instruct an IS-IS device to enter the overload state during its start or restart. After BGP convergence is complete, cancel the overload bit.
The system view is displayed.
The IS-IS view is displayed.
The overload bit is configured.
The configuration is committed.