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IETF 62, Minneapolis 03/08/2005

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IETF 62, Minneapolis 03/08/2005

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  1. Routing extensions for discovery of TE Node Capabilities draft-vasseur-ccamp-te-node-cap-00.txt Jean-Philippe Vasseur (Cisco) Jean-Louis Le Roux (France Telecom) Peter Psenak (Cisco) Stefano Previdi (Cisco) Seisho Yasukawa (NTT)Paul Mabey (Qwest) IETF 62, Minneapolis 03/08/2005

  2. History • Initially three drafts • A functional spec defining routing extensions for the advertisement of TE node information • TE Mesh group, TE node cap & PCE capabilities • An ISIS encoding spec • An OSPF encoding spec • These drafts were mixing pretty distinct functions • Better to have each function in a separate draft, specifying both ISIS and OSPF encoding and procedures =>Two new drafts: draft-vasseur-ccamp-te-node-cap-00.txtdraft-vasseur-ccamp-auto-mesh-00.txt • Note: PCE discovery will be addressed in the PCE WG

  3. Content Overview • This draft defines ISIS and OSPF extensions for the advertisement of TE node capabilities • Data plane node capabilities (e.g. P2MP Branch LSR) • Control plane capabilities (e.g. P2MP Signaling) • To be used as constraints during TE-LSP path computation • To avoid nodes that do not support a given TE capability either in the control or data plane • Or to trigger procedure to handle such nodes (backward compatibility)

  4. The TE Node Capability Descriptor TLV • TE Node Capability Descriptor TLV • DATA-PLANE-CAP sub-TLV • CONTROL-PLANE-CAP sub-TLV • To be carried • Within the OSPF Router Information LSA • Within the ISIS CAPABILITY TLV • Set of bit flags, where each bit represents a node capability • Several TE node capabilities currently defined • Two Data plane capabilities : P2MP Branch LSR, P2MP Bud LSR • Three Control plane capabilities : 3209 support, 3473 support ,P2MP Signaling • Extensible encoding => New capabilities could be defined in the future

  5. Next steps • Facilitate path computation within a network that contains LSRs with distinct capabilities • Particularly required for P2MP MPLS Tree computation • Ligth extensions • Static information, no impact neither on IGP scalability nor on IP routing • Will have to be reviewed by OSPF and ISIS WGs • Adopt as a WG document?

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