IETF73 ANCP WG*ANCP Applicability to PON draft-bitar-wadhwa-ancp-pon-00.txtUpdate on Differences from DSL Nabil Bitar, Verizon Sanjay Wadhwa, Juniper NetworksFrancois LeFaucheur, Cisco

IETF73 ANCP WG

IETF73 ANCP WG*Outline

Drivers for ANCP in PON based Broadband Networks

Use Cases

Main Differences from DSL case multicast focus

Proposal

IETF73 ANCP WG

IETF73 ANCP WG*Drivers for ANCP in PON based Broadband NetworksTight coordination required between NAS and ANX to implement triple-play services with necessary QoE, including end-to-end bandwidth-optimized video deliveryCoordination also required between components of ANX (OLT and ONT) for optimized video delivery

Admission control over links on the data path between NAS and HGW (potential bottlenecks): NASOLT, OLTONT, ONTHGWSynchronized multicast replication on NAS, OLT, and ONT

Interaction needs to be real-time as services are requested via network or application level signaling.

IETF73 ANCP WG

IETF73 ANCP WG* Use Cases-Video FocusUnified Video Resource ControlMulticast Admission ControlVoD Admission ControlMulticast Conditional AccessAccess Topology Discovery Not covered in this presentationRemote Connectivity Check Not covered in this presentation

IETF73 ANCP WG

IETF73 ANCP WG*Unified Video Resource Control Option1: All control Centralized on NAS

Access and admission control for multicast performed by NAS.IGMP is processed and terminated on the NAS.Multicast replication distributed to ANX (ONT and OLT) under the control of NASNAS also participates in bandwidth-based admission control for VoD triggered by VoD signaling + policy manager queryOr, admission request directly from video application server (not depicted in the following options reference diagrams)

IETF73 ANCP WG

IETF73 ANCP WG*Unified Video Resource Control Option1: All control Centralized on NAS (cont.)NAS performs video (unicast and multicast) bandwidth accountingBandwidth-based admission control takes into account the following constraints:Subscriber BandwidthPON BandwidthOLT-NAS Link Bandwidth

IETF73 ANCP WG

IETF73 ANCP WG*Unified Video Resource Control Option1: All control Centralized on NAS (cont.)IGMP JOIN (S/*, G)Access Control &Subscriber B/W, PON B/Wand OLT Link B/W based Admission Control ANCP Replication Start{ , Customer-Port-ID} ANCP Replication Start{ , Customer-Port-ID} Multicast Flow (S,G) on Multicast VLANMulticast Flow (S,G) forwardedon unidirectional on the PON by OLT. Multicast Flow (S,G) forwarded on Customer-Port by ONT/ONU.

IETF73 ANCP WG

IETF73 ANCP WG*Unified Video Resource Control Option1: All control Centralized on NAS (cont.)IGMP LEAVE (S/*, G)Admission Control

ANCP Replication Stop{ , Customer-Port-ID} ANCP Replication Stop{ , Customer-Port-ID}

IETF73 ANCP WG

IETF73 ANCP WG*Unified Video Resource Control Option1: All control Centralized on NAS (cont.)NASOLTONUPONONTHGWHGWHGWANCPSubscriber B/W, PON B/Wand OLT Link B/W based Admission ControlPolicyServerApplicationServerAdmissionRequest Admission Response VoD Request Admission Request Admission Response

IETF73 ANCP WG

IETF73 ANCP WG*Unified Video Resource Control Option2: Admission Control on NAS and ANXANX (OLT and ONT) snoops IGMP to create replication state.ANX (OLT) performs bandwidth admission control on PON bandwidth. NAS performs bandwidth admission control on subscriber bandwidth and OLT link bandwidth triggered by admission requests from ANX for multicast.NAS interacts with OLT using ANCP (for PON bandwidth accounting) to perform admission control for VoD.

IETF73 ANCP WG

IETF73 ANCP WG*Unified Video Resource Control Option2: Admission Control on NAS and ANXNASOLTONTPONHGWHGWANCPIGMP JOIN (S/*, G)Subscriber B/W & OLT Link BW Admission Control Admission-Request{ Flow, Customer-Port-ID}IGMP SnoopingIGMP Snooping Access Control &PON B/W Admission ControlPass Admission-Request{ Flow, Customer-Port-ID} Admission-Reply-Pass{ Flow, Customer-Port-ID}Update Replication State Admission-Reply-Pass{ Flow, Customer-Port-ID}Update Replication State Access ControlPass

IETF73 ANCP WG

IETF73 ANCP WG*Unified Video Resource Control Option2: Admission Control on NAS and ANXIGMP JOIN (S/*, G)Subscriber B/W & OLT Link BW Admission Control Admission-Request{ Flow, Customer-Port-ID}IGMP SnoopingIGMP Snooping Access Control &PON B/W Admission ControlPass Admission-Request{ Flow, Customer-Port-ID} Admission-Reply-Fail{ Flow, Customer-Port-ID}Release PON B/W Update Replication State Admission-Reply-Fail{ Flow, Customer-Port-ID}Remove Replication StateFail Access Control

IETF73 ANCP WG

IETF73 ANCP WG*Unified Video Resource Control Option2: Admission Control on NAS and ANXNASOLTONUPONONTHGWHGWHGWANCPPolicyServerApplicationServerAdmissionRequest Admission Response VoD Request Admission Request Admission ResponseSubscriber B/Wand OLT Link B/WAdmission Control Admission-Request { Bandwidth, Customer-Port-ID}PON B/WAdmission ControlPass Admission-Response { Customer-Port-ID}

IETF73 ANCP WG

IETF73 ANCP WG* Multicast Conditional AccessTwo approaches for Network based Conditional Access:Centralized on NAS. It could be triggered by admission request from ANX using ANCP or simply by IGMP.Distributed to ANX (OLT and ONT). White and Black lists may be provisioned on OLT and ONT by NAS using ANCP.Requests for groups in the Black list dropped closest to the subscriber (on the ONT).Requests for groups which are not blocked by Black list can be propagated upstream towards OLT and NAS for bandwidth based admission control.

IETF73 ANCP WG

IETF73 ANCP WG*Access Topology DiscoveryNAS can discover DSL sync rate via ANCP for DSL local loops on a PON-fed Access Node (AN).ONT (GPON Fed AN) can inform OLT of the DSL sync rate via ANCP.OLT can inform NAS of the sync rate via ANCPOLT can also inform NAS of the bandwidth on the OLT uplink to the NAS (this is relatively static, but NAS needs to always have an accurate picture of the available bandwidth on OLT uplink ). NASOLTGPONFedANPONONTHGWHGWHGWANCPHGWDSL1DSL2DSLnANCP

IETF73 ANCP WG

IETF73 ANCP WG*Main Differences from DSL case Multicast Focus

Replication points:PON: Three replication points (1) NAS, (2) OLT, (3) ONT/ONUxDSL: Two replication points (1) NAS, (2) DSLAMPON requires extension of replication control to one more point the ONTIn Option1, from NAS to OLT to ONT

PON in the downstream direction between the OLT and ONT is a broadcast medium shared across users while in DSL the medium between the DSLAM and the ATU-R is dedicated per subscriberIn DSL, one can make bandwidth admission control based on NAS-DSLAM link available bandwidth, and available bandwidth per subscriberIn PON, one needs to make bandwidth admission control based on PON available bandwidth in addition to NAS-OLT and subscriber-available bandwidth as PON is shared across a set of subscribersRequire PON available bandwidth accounting across users sharing the same PON Customer port ID includes port identification and PON bandwidth accounting on NAS (option1)Or, distributed admission control between NAS (maintain subscriber and NAS-OLT) and OLT (maintain PON bandwidth accounting) (option 2)

IETF73 ANCP WG

IETF73 ANCP WG*OMCI vs ANCP

OMCI is today the configuration control channel between the OLT and ONT in PONOMCI does not require IP for ONT managementOMCI not designed for real-time transactions

ANCPApplicable between OLT and ONTrequires communication over TCP/IP between OLT and ONTWhere the ONT does not support TCP/IP or is not reachable via IP, potentially the ANCP messages can be translated/communicated over OMCI for the purpose of multicast admission control and replicationOMCI is outside the scope of IETF and ANCP WGIf OMCI defines necessary extensions, ANCP-OMCI gateway function at the OLT may be defined

IETF73 ANCP WG

IETF73 ANCP WG*ProposalFramework:Option1: Incorporate use-cases for ANCP as applicable to PON, and corresponding requirements for ANX and NAS, into the ANCP framework draft. Option2: Keep use cases for ANCP as applicable to PON in a standalone document and evolve it as a WG document Protocol:Option 1: Add protocol extensions, and corresponding handling on ANX and NAS for the described use-cases to the protocol draft - preferredOption 2: Define the deltas over protocol draft in a separate document and merge it later in protocol draftOption 3: Define the deltas over protocol draft in a separate document and evolve it as standaloneFormulticast, identify PON port on OLT and customer port on ONT/ONU on which replication is to occur

IETF73 ANCP WG

IETF73 ANCP WG*Questions/DiscussionThanks!

IETF73 ANCP WG

Backup

IETF73 ANCP WG

IETF73 ANCP WG*PON Specific Terminology

Passive Optical Network (PON)Composed of Optical Line Terminal (OLT). Optical Network Terminal (ONT), and splitters:Upstream (ONT to OLT):: TDM accessDownstream (OLT to ONT): Point to Multipoint network in which unpowered splitters are used to split an optical signal on single optical fiber from OLT to multiple premises ONTsAccess Node Complex (ANX)The Access Node (ANX) decomposed by two geographically distributed functions, performed by OLT and ONU/ONT. The general term Access Node (ANX) is used when describing functionality which doesn't depend on the physical location but rather on the "black box" behavior of OLT and ONU/ONTOLT (Optical Line Terminal) : Located in the Service provider's central office. Terminates and aggregates multiple PONs on the user side, and interfaces with the network service element (NAS) providing subscriber management. ONT (Optical Network Terminal) : terminates PON on the network side and provides PON adaptation. User-side interface and location dependent upon Network Deployment.

IETF73 ANCP WG

IETF73 ANCP WG*PON Specific Terminology

ONT (contd).FTTP : Fiber all the way to the premises. ONT has Ethernet (FE/GE) connectivity with HGW. In case of MDU, multi-subscriber ONU resides in basement or wiring closet and has FE/GE connectivity with each CPE.FTTC : Fiber terminated outside the premise. Last leg could be via xDSL (typically VDSL). OLT and ONT together referred to as PON FED DSLAM.PON-Customer-ID Identifier which uniquely identifies the ANX, and the access loop logical port to the customer premise. Logically composed of information containing identification of the OLT, the PON port on the OLT, the ONT, and the port on the ONT.

IETF73 ANCP WG

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