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

[James R. L. <jl...@mi...>]

See below:

On Thu, Aug 29, 2002 at 03:20:25AM -0700, Paresh Patil wrote:
> 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.

In the ldp-mib an interface and a remote peer have a
common base called an entity.  They each have some
specific config, but most of their LDP information
and operation is derived from the entity.

> 2. There is little confusion about mappings. Why is
> in:out label mapping is 1:n and not n:m.

Actually that should be n:1 multiple inlabels can point
to the same outlabel (label merge), but not vice versa
(that would be multipoint LSPs which are not supported
by MPLS (officially atleast) or LDP.

> 
> Regards,
> Paresh
> 
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-- 
James R. Leu