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TMPLS Background

TMPLS Background. Stewart Bryant stbryant@cisco.com. T-MPLS. T-MPLS was liaised to IETF after it was consented by the ITU. Product of ITU-T SG15 Q12 - G.8110(.1), G.8112, G.8121, G.8131 T-MPLS is essentially an Ethernet PW, running over MPLS PSN, running over Ethernet

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TMPLS Background

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  1. TMPLS Background Stewart Bryant stbryant@cisco.com

  2. T-MPLS • T-MPLS was liaised to IETF after it was consented by the ITU. • Product of ITU-T SG15 Q12 - G.8110(.1), G.8112, G.8121, G.8131 • T-MPLS is essentially an Ethernet PW, running over MPLS PSN, running over Ethernet • OAM is G.8114/Y.1373a derivative of Y.1711, currently in AAP (restricted last call) • Existing definition is statically - centrally - configured however ITU looking at developing a control plane • Normative text is a complete re-definition of the protocol using specialist ITU language and formal notation.

  3. TMPLS & MPLS Disjoint? • ITU SG15 experts claim that MPLS and T-MPLS will always be configured to be in disjoint layers in the network and that this is sufficient. • Goal is to be able to transport T-MPLS on existing equipment via the use of MPLS codepoint. • Disjoint layers claimed as TMPLS is "below MPLS" • Claimed no need for different codepoint as no intentions for interoperability (However ITU interoperability contributions have been presented in SG15 )

  4. IETF Concerns • Liaison statements have been exchanged and various IAB/IESG/WG chairs have attended a number of ITU SG15 meetings in person expressing concerns about T-MPLS. • IETF is concerned that T-MPLS, or a development of T-MPLS will break MPLS or an IETF development of MPLS. • Issue is shared code point for different specification of the functionality and attributes. Excellent opportunity for collision. • Experience tells us that initial limited functionality never remains limited. • Massive interoperability issues could ensue • Work plan includes incorporating new PW types that duplicate existing IETF PWE • Further discussion will take place in PWE3 this afternoon.

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