Re: [PWE3] PWE Service interworking

[Mark Seery <mark@mseery.com>]

Eric,

Comments in line,
Mark

--- Eric Rosen <erosen@cisco.com> wrote:
> Shahram> Regarding Service interworking I believe
> the simplest and
> Shahram> most logical model is to do service
> interworking with MPLS
> Shahram> on both IWFs. 
> 
>> [ERIC] 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". <<

MS=> Well perhaps the term is a bad one - that should
not be enough to disqualify the idea, but the point
you make below is worth discussing.

[ERIC] And hopefully things will stay that way.

MS=> Somehow I doubt it ;-)

> 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. 
> 
>> [ERIC] 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. <<

MS=> Well there is this emerging thing called
Ethernet; and there was Jack's note about a
requirement for ATM CES-TDM service interworking. But
to your point, FR/ATM/IP cover I would say at least
90% of the cases today (not including private line
TDM); so a lot can be achieved with the approach of
doing IWF either side of the PW, as a practical matter
today. Probably the trickier discussion is what makes
sense for tomorrow, and what makes sense for people
that want to move towards one integrated network from
an OAM, management plane, and control plane
perspective; and what volume will be achieved with
these new services. 

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