Chapter Eight. Signaling for Protection and Restoration

8.1 INTRODUCTION

8.2 SPAN PROTECTION

8.2.1 Functional Description

8.2.2 Messages

8.2.2.1 Failure Indication Message

8.2.2.2 Switchover Request Message

8.2.2.3 Switchover Response Message

8.2.3 Preventing Unintended Connections

8.2.4 Reversion

8.2.5 Signaling Mechanisms

8.3 END-TO-END DEDICATED MESH PROTECTION

8.3.1 Unidirectional 1 + 1 Protection

8.3.2 Bidirectional 1 + 1 Protection

8.3.2.1 Functional Description

8.3.3 Messages

8.3.3.1 End-to-End Failure Indication Message

8.3.3.2 End-to-End Failure Acknowledge Message

8.3.3.3 End-to-End Switchover Request Message

8.3.3.4 End-to-End Switchover Response Message

8.3.4 Signaling Procedures

8.3.4.1 Provisioning the Protection Path

8.3.4.2 End-to-End Failure Indication and Acknowledgment

8.3.4.3 End-to-End Switchover Request and Response

8.4 END-TO-END SHARED MESH PROTECTION

8.4.1.1 Functional Description

8.4.2 Messages

8.4.2.1 End-to-End Failure Indication and Acknowledgment

8.4.2.2 End-to-End Switchover Request

8.4.2.3 End-to-End Switchover Response

8.4.2.4 Reversion

8.4.3 Signaling Procedures

8.4.3.1 Provisioning the Protection Path

8.4.3.2 End-to-End Failure Indication and Acknowledgment

8.4.3.3 End-to-End Switchover Request and Response

8.4.3.4 Reversion

8.5 DISCUSSION

8.5.1 Performance Aspects and MPLS Fast Reroute

8.5.2 Restoration

8.6 SUMMARY