Target Choice of PW Type

1
Target Choice of PW Type

• AKA Wildcard PW Type
• George Swallow
• swallow_at_cisco.com

2
Background

• ?draft name/tile broken s/b PW Type
• draft-swallow-pwe3-spvc-iw brought here several
  eons ago
• It was decided this work was more appropriate for
  MFA Forum because only small bits and pieces
  directly affected PWE. Those pieces, however
  were to be brought back here
• Liaison from MFA Forum, presented in Paris
  requested this functionality

3
Reference ApplicationTransitioning ATM endpoints
to PEs
Customer Site
Customer Site
Customer Site
Customer Site
PE
MPLS
ATM
Customer Site
Customer Site
4
The Problem (left brain)

• Interworking PE must have no per connection
  configuration (derives from need for redundancy)
• ATM connection may be for either a frame or cell
  service
• More effective to reassemble at Interworking PE
  than at customer facing PE
• Need for reassembly may not be clearly inferrable
  from ATM signalling message

5
The problem (right brain)
Customer Site
Customer Site
PE1
Label Mapping
PNNI / Q.2931
MPLS
ATM
PE2
6
The Problem (left brain)

• PW Type must be first signaled from Interworking
  PE to target PE
• Within PWE3 domain, need for reassembly is only
  known at the target PE

7
Proposal

• New PW type that allows target to choose PW Type
• Semantics are
• You (the target) decide
• Ill use (assuming I can)
• To be compliant with stipulation that PW types
  must match, acts as a wildcard - matches anything
  (except itself)
• May have wider applicability

8
Next Steps

• Make it a workgroup draft
• Fix title
• Get WG feedback