Level 3 Route Management Functions
Transfer Prohibited Control
- TFP, TCP messages from STP re X
- Criteria: starts routing to X, X becomes inaccessible, link recovers
Transfer Allowed Control
- TFA, TCA messages from STP re X
- Criteria: stops routing to X, X becomes accessible
Transfer Restricted Control
- TFR, TCR messages from STP re X
- Criteria: secondary route usage, link recovery