[Teas] Use cases discussed during the IETF TE Topology YANG Model Design Meeting

[Dieter Beller <[e-mail]>]

Hi TEAS WG,

as suggested by Lou, I am sharing with you some slides describing single 
layer and multi layer use cases, which were discussed during
the IETF TE Topology YANG Model Design Meeting yesterday.

The first 2 slides address (sub-)network abstraction and propose to use 
the connectivity matrix in case the resulting abstract node is
not blocking free.

The remaining slides are describing multi-layer network scenarios where 
a server layer trail is established in order to carry client layer
connections. In order to support multi-layer path computation, 
transitional links are proposed, which allow the construction of a
multi-layer network topology graph. Transitional links connect the 
topology graphs of two adjacent network layers. They are created
based on the capability of a node to encapsulate a client layer signal 
into a server layer signal. Exampleas are: IP in MPLS, OTN ODUk
into an OCh signal. While the transitional link concept is explained in 
the context of the OTN, it is generally applicable to all mult-layer
networks.

According to my perception, there was rough consensus that transitional 
links are useful  and should be included in the TE topology
YANG models.

Comments are welcome.


Thanks,
Dieter