RE: [PWE3] PWE Service interworking

[Keith Knightson <kgk@igs.net>]

At 4:33 PM -0400 5/6/03, David Allan wrote:
If you're concatenating technologies together for SWIF, then yes the 
layers terminate. Its also a pain to interwork OAM protocols as the 
semantics may not match. The 17iw stuff assume we're interworking 
states of separate entities to get an overall view.

NIWF does have a better e2e story but as a pure overlay, you're just 
keeping the old game alive. Deploying old edge and new core.

Didn't quite get your third comment?

cheers
Dave

Dave,

How can any customer know whether his path at the "layer" in question 
ends on a SIWF or a NIWF?

It seems probable me that a given customer may have several paths 
from his CE using exactly the same protocol stack to the PE, and 
depending on where and who provides the last PE, may in fact have 
some paths terminating on  a SIF and some on a NIF, depending a 
variety of intervening networks and access networks. What should he 
expect the semantics of his OAM to be?     I do not think it 
reasonable for the customer to know all the technical components in 
any or all paths from him to anywhere/everywhere.

Agreed all semantics may not map or be available.  That's the price of SIFs.

Cheers

Keith

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