Presentation on theme: "OSPF-TE extensions for GMPLS Control of Evolutive G.709 OTN"— Presentation transcript:
1OSPF-TE extensions for GMPLS Control of Evolutive G.709 OTN draft-ceccarelli-ccamp-gmpls-ospf-g709-00CCAMP WG, IETF 76th Hiroshima
2Authors/Contributors Daniele CeccarelliDiego CavigliaFatai ZhangDan Li
3Agenda OTN TE info needed for LO ODU path computation WSON TE info out of scopeInterface Switching Capability Descriptor [RFC 4203]Info introduced into “Switching Capability-specific information” to introduce minor changes to the routing protocolRouting procedure as per [RFC 3630][RFC 4203]Compatibility considerations
4OTN TE info needed for path computation (1/2) Tributary slot type1,25Gbps vs 2,5GbpsTE link typeDifferent OTUk typeDifferent TS bandwidthODUflex: The actual TS bandwidth of a TE link is useful to determine the number of TSs neededLO ODU signal typeThe equipments along a path could not be able to support all kinds of LO ODU.If a a path is requested for a certain ODU type, all the link not supporting such ODU types must not be taken into account during path computation.
5OTN TE info needed for path computation (2/2) TE link total bandwidthUnbundled link: depends on the type of OTU or HO ODU (deduced from total number of TSs).Bundled link: sum of the total bandwidth of the physical links composing the TE link.TE link unreserved bandwidthDefined as the sum of the unreserved bandwidths of the component links.Accounted through the unallocated TSs of the TE link.Maximum LSP bandwidthComponent link with the maximum unreserved bandwidth24x1,25Gbps + 20x1,25Gbps = 24x1,25Gbps Max LSP band
6Interface Switching Capability Descriptor New Switching Cap value to distinguish evolutive OTN from existing TDM networks (e.g. SDH)110 – Evolved OTNMax LSP Bandwidth counted as number of TSs.
7Switching Capability specific information (1/2) T = Type of TSs0 = 1,25Gbps, 1 = 2.5 GbpsOD(T)Uk = Type of TE link The server layer signal that the LO ODUs can be mapped or multiplexed into
8Switching Capability specific information (1/2) Signal Flags : LO ODU type supported by the TE link.Flag set = Corresponding LO ODU signal supportedTotal TS = Total number of TS inside the TE linkUnreserved TS = Number of unreserved TS of the TE link
9Compatibility considerations When a node receives a LSA with Switching Capability type 110, the Maximum Bandwidth sub-TLV and Unreserved Bandwidth sub-TLV in this LSA, if present, SHOULD be ignored. The bandwidth information SHOULD be deduced from ISCD sub-TLV (i.e., Total TS, Unreserved TS).Legacy nodes that do not implement the extensions defined in this document are able to ignore the LSA containing an ISCD sub-TLV with the Switching Cap type 110, because it is an unknown value.They will continue to flood the LSA to other neighborsInformation carried in this LSA will not be used.
10Next stepsFollow latest progresses on G.709Move non normative signal types to AppendixComments appreciated