CONTENTS

 1     Scope 
 2     References
 3     Definitions    
 4     Abbreviations 
 5     Discovery methodology
 6     Mechanisms for Layer Adjacency Discovery  
 7     Attributes used in layer adjacency      
 8     Layer adjacency based on trail trace string      
        8.1     Discovery Message formats      
 9     Layer adjacency based on embedded control channel messages
        9.1     LAPD-based mechanism 
        9.2     PPP-based mechanism    
10     Procedures    
11     Discovery response message   
       11.1     Miswiring detection      
       11.2     Misconnection detection
Appendix I – Implementation example of discovery process    
        I.1       Layer Adjacency Discovery information flow 
Appendix II – Miswiring detection    
       II.1     Auto discovery procedures       
       II.2     Example: Interaction between two DAs using different Discovery Message formats   
Appendix III – Example of Discovery Response Message using generalized MPLS-based mechanism    
Appendix IV – Layer Adjacency Discovery implementation examples    
Appendix V – In-band message encoding example