[mpls-linux-general] Need Clarification on ldp-struct-txt

[Paresh P. <par...@ya...>]

Hi all,

I have small querry regarding MPLS-LDP implementaion.

In ldp-portable-0.110.tar.gz In the directory doc
there is file ldp_struct.txt that shows various
elements in LDP implementations and relations between 
them as shown below.
                                       -----
                                      |     |
                               .------| Adj |
                              /       |     |
 ----------                  /         -----
| In Label |-------.       1:1           |
 ----------        N:M     /             |
     |               \    /             1:N
    1:N               \  /               |
     |              ---------         --------     
 ----------   N:1  |         |  N:1  |        |  1:1|
|Out label |<----->| Session |<----->| Entity |<----|
 ----------        |         |       |        |     |
                    ---------         --------   
                        |                |
                       N:M              1:1
                        |                | 
                     ------            -----
                    |      |          |     |
                    | Addr |          | If  |
                    |      |          |     |
                     ------            -----

1. I am not clear about what is 'Entity' in this 
diagram.
2. There is little confusion about mappings. Why is
in:out label mapping is 1:n and not n:m.

Regards,
Paresh

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