Add CLI commands to suspend and re-activate links #1594
Description
The suspended state for links already exists in the program, but contributors currently have no way to use it through the CLI. New commands must be added so that contributors can suspend an active link and later re-activate it when needed.
Use cases:
- Temporarily disabling a link with high packet loss.
- Suspending a flapping link to stabilize routing.
Expected behavior:
- Provide a CLI command to set a link’s state to suspended.
- Provide a CLI command to restore a suspended link to active.
- When a link is in suspended state, it must be excluded from IS-IS and not used in traffic routing.