Re: [PWE3] PWE Service interworking

[Eric Rosen <erosen@cisco.com>]

Shahram> Regarding Service interworking I believe the simplest and
Shahram> most logical model is to do service interworking with MPLS
Shahram> on both IWFs. 

Fortunately, "service interworking with MPLS" is not possible at the current
time  as there  is  such  thing (at  least  not in  the  IETF)  as an  "MPLS
service".  And hopefully things will stay that way.

Shahram> The  advantage is  that each  PE needs  to support  a maximum  of N
Shahram> service interworking functions (N is all known L2 protocols). While
Shahram> your  proposed   model  requires  N   square  service  interworking
Shahram> functions to be supported in a single PE. 

There  are certain  theoretical  advantages  to having  a  sort of  "generic
service"  to/from which  all other  services could  be mapped.   However, if
FR/ATM interworking  on the  one hand  and ARP Mediation  on the  other hand
cover 99% of the  space, there doesn't really seem to be  much need for this
generic service.  

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