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Standard Representation of Domain Sequence for Path Computation in Networks

This document outlines a clear definition and encoding of Domain Sequences integral to Path Computation Elements (PCE) within networking contexts. A Domain Sequence represents an ordered list of domains—such as Autonomous Systems (AS) or IGP Areas—that must be traversed to reach the destination. It details functionalities like specifying boundary nodes and inter-AS links, operation modes, and usages in discovering paths collaboratively. Further, this draft serves as a pivotal point for inter-domain PCE mechanisms and requests for working group adoption at the IETF.

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Standard Representation of Domain Sequence for Path Computation in Networks

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  1. Standard Representation Of Domain Sequence draft-dhody-pce-pcep-domain-sequence-02 Dhruv Dhody (dhruv.dhody@huawei.com) Udayasree Palle (udayasreepalle@huawei.com) Ramon Casellas (ramon.casellas@cttc.es) 83rd IETF @ Paris

  2. Updates from -01 • Clear definition of Domain Sequence • A domain-sequence is an ordered sequence of domains traversed to reach the destination domain. In this context a Domain could be an Autonomous System (AS) or an IGP Area. Note that an AS can be further made of multiple Areas. • Provision to specify Boundary Nodes & Inter-AS Links as a part of Domain-Sequence • Thus a Domain-Sequence MAY be made up of one or more of – • o AS Number • o Area ID • o Boundary Node ID • o Inter-AS-Link Address 83rd IETF @ Paris

  3. Updates from -01 • Encoding of Domain Sequence 83rd IETF @ Paris

  4. Updates from -01 • Mode of Operation • Domain-Sequence can be used: • by a PCE in order to discover or select the next PCE in a collaborative path computation, such as in BRPC [RFC5441]; • by the Parent PCE to return the domain sequence when unknown, this can further be an input to BRPC procedure; • by a PCC (or PCE) to constraint the domains used in a H-PCE path computation, explicitly specifying which domains to be expanded; • Algorithm that MAYBE used to select the next PCE 83rd IETF @ Paris

  5. Next Steps • Request for WG adoption • Key for all inter-domain PCE mechanism • BRPC • P2MP Inter domain • HPCE • Referenced in PCE documents (WG and otherwise) 83rd IETF @ Paris

  6. Questions & Comments? 83rd IETF @ Paris

  7. Thanks! 83rd IETF @ Paris

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