1 Scope
2 References
3 Definitions
4 Abbreviations
5 Conventions
5.1 Representation
of octets
6 Introduction
7 Requirements
8 Protection
characteristics
8.1 Monitoring
methods and conditions
9 Protection
group commands
9.1 End-to-end
commands and
states
9.2 Local
commands
10
Protection architectures
10.1 Unidirectional and bidirectional
switching
10.2 Need for APS
communication
10.3 Revertive and non-revertive
switching
10.4 Provisioning mismatches
10.5 Protection switching
trigger
10.6 Protection switching
models
11
APS Protocol
11.1 APS
format
11.2 1-phase APS
protocol
11.3 Request
type
11.4 Protection types
11.5 Requested signal
11.6 Bridged signal
11.7 Control of bridge
11.8 Control of
selector
11.9 Signal fail of the protection transport
entity
11.10 Equal priority requests
11.11 Command acceptance and
retention
11.12 Hold-off timer
11.13 Wait-to-restore
timer
11.14 Exercise
operation
11.15 Failure of protocol
defects
Annex A – State transition tables of protection switching
A.1 State
transition for 1:1 bidirectional switching with revertive
mode
A.2 State
transition for 1:1 bidirectional switching with non-revertive
mode
A.3 State
transition for 1+1 bidirectional switching with revertive
mode
A.4 State
transition for 1+1 bidirectional switching with non-revertive
mode
A.5 State
transition for 1+1 unidirectional switching with revertive mode
A.6 State
transition for 1+1 unidirectional switching with non-revertive
mode
Appendix I – Operation example of 1-phase APS protocol
I.1 Introduction
I.2 Example
scenario
I.3 APS
protocol examples
Appendix II – Interaction between Ethernet protection switching and
STP
Appendix III – MIPs for protection switching
environment
III.1
Introduction
III.2
Considerations
III.3 Configuration
examples