IETF74 ANCP WG 1

ANCP Applicability to PON draft-bitar-wadhwa-ancp-pon-01.txtUpdate on Differences from DSL

Nabil Bitar, Verizon

Sanjay Wadhwa, Juniper Networks

IETF74 ANCP WG 2

Main Differences between PON and DSL

PON

1. Access-Node functionality split between OLT and ONT.

Dynamic control plane required between NAS and OLT and between OLT and ONT.

2. Multicast Replication Control

Three potential replication points – NAS, OLT and ONT

3. Bandwidth based admission control for video:

Three bandwidth constraint points:

o NAS-OLT link bandwidth

o PON bandwidth

o Subscriber bandwidth

DSL

1. Access-Node functionality contained on the DSLAM.

Dynamic control plane required between NAS and DSLAM.

2. Multicast Replication Control

Two potential replication points – NAS and DSLAM.

3. Bandwidth based admission control for video:

Two bandwidth constraint points

o NAS – AN link bandwidth

o Subscriber bandwidth

IETF74 ANCP WG 3

Main Differences between PON and DSL

PON

3. Bandwidth based admission control for video (contd.)

If bandwidth based admission control centralized on NAS, then NAS needs additional bandwidth accounting for PON bandwidth and admission control logic for check against available PON bandwidth.

If bandwidth based admission control is distributed between NAS and OLT:

ANCP messaging to reconcile NAS based admission control (for NAS-OLT link and subscriber bandwidth) with OLT based admission control (for PON bandwidth) before admitting an IGMP join.

Additional ANCP interaction for NAS to check with OLT if PON bandwidth available before admitting a VoD flow.

IETF74 ANCP WG 4

Main Differences between PON and DSL

PON

4. Topology Discovery use-case for PON-fed DSLAMs

ANCP message from ONT to OLT for DSL sync rate notification.

ANCP message from OLT to NAS to relay the DSL sync rate notification.

5. PON-Customer-ID for identification of access-loop logically composed of:

< OLT-ID, PON-port on OLT,

ONT-ID, customer-port-on-ONT >

Just as in the DSL case, this identifier can be inserted by the OLT in option-82 when acting as a DHCP relay. The format is transparent to the BNG.

DSL

4. Topology Discovery use-case requires ANCP message from DSLAM to NAS for DSL sync rate notification.

5. Agent-Circuit Identifier for identification of access-loop composed of:

< DSLAM-ID, customer-port-on-DSLAM >

IETF74 ANCP WG 5

Control plane between OLT and ONT : OMCI vs ANCP

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

ANCP Applicable between OLT and ONT requires communication over TCP/IP between OLT and ONT

Where 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 replication

OMCI is outside the scope of IETF and ANCP WG If OMCI defines necessary extensions, ANCP-OMCI gateway function at

the OLT may be defined

IETF74 ANCP WG 6

Proposal Re-charter ANCP-WG to consider ANCP extensions for

PON.

Framework: Option 1 : Incorporate use-cases for ANCP as applicable to

PON, and corresponding requirements for ANX and NAS, into the ANCP framework draft.

Option 2: 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 - preferred

Option 2: Define the deltas over protocol draft in a separate document and merge it later in protocol draft

Option 3: Define the deltas over protocol draft in a separate document and evolve it as standalone

IETF74 ANCP WG 7

Questions/Discussion

Thanks!

Backup

IETF74 ANCP WG 9

PON Specific Terminology

Passive Optical Network (PON) Composed of Optical Line Terminal (OLT). Optical Network Terminal

(ONT), and splitters :Upstream (ONT to OLT):: TDM access Downstream (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’ ONTs

Access 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/ONT

OLT (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.

IETF74 ANCP WG 10

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.

IETF74 ANCP WG 11

Outline

Drivers for ANCP in PON based Broadband Networks

Use Case Recap

Main Differences from DSL case

Proposal

IETF74 ANCP WG 12

Drivers for ANCP in PON based Broadband Networks

Tight coordination required between NAS and ANX to implement triple-play services with necessary QoE, including end-to-end bandwidth-optimized video delivery

Coordination 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, ONTHGW

Synchronized multicast replication on NAS, OLT, and ONT

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

IETF74 ANCP WG 13

Use Cases-Video Focus

Unified Video Resource Control Multicast Admission Control VoD Admission Control

Multicast Conditional Access Access Topology Discovery Remote Connectivity Check

IETF74 ANCP WG 14

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 NAS NAS also participates in bandwidth-based admission

control for VoD triggered by VoD signaling + policy manager query Or, admission request directly from video application server

(not depicted in the following options reference diagrams)

IETF74 ANCP WG 15

Unified Video Resource Control Option1: All control Centralized on NAS (cont.)

NAS performs video (unicast and multicast) bandwidth accounting

Bandwidth-based admission control takes into account the following constraints: Subscriber Bandwidth PON Bandwidth OLT-NAS Link Bandwidth

IETF74 ANCP WG 16

Unified Video Resource Control Option1: All control Centralized on NAS (cont.)

NAS OLT ONTPON

ONT HGW

HGW

HGWANCP

IGMP JOIN (S/*, G)

Access Control &Subscriber B/W, PON B/Wand OLT Link B/W based Admission Control

ANCP Replication Start{ <S/*,G>, Customer-Port-ID}

ANCP Replication Start{ <S/*,G>, Customer-Port-ID}

Multicast Flow (S,G) on Multicast VLAN

Multicast Flow (S,G) forwardedon unidirectional <Multicast GEM-PORT> on the PON by OLT.

Multicast Flow (S,G) forwarded on Customer-Port by ONT/ONU.

IETF74 ANCP WG 17

Unified Video Resource Control Option1: All control Centralized on NAS (cont.)

NAS OLT ONTPON

ONT HGW

HGW

HGWANCP

IGMP LEAVE (S/*, G)

Admission Control<Resource Released>

ANCP Replication Stop{ <S/*,G>, Customer-Port-ID}

ANCP Replication Stop{ <S/*,G>, Customer-Port-ID}

IETF74 ANCP WG 18

Unified Video Resource Control Option1: All control Centralized on NAS (cont.)

NAS OLT ONUPON

ONT

HGW

HGW

HGWANCPSubscriber B/W, PON B/W

and OLT Link B/W based Admission Control

PolicyServer

ApplicationServer

AdmissionRequest Admission Response

VoD Request

Admission Request

Admission Response

BACK

IETF74 ANCP WG 19

Unified Video Resource Control Option2: Admission Control on NAS and ANX

ANX (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.

IETF74 ANCP WG 20

Unified Video Resource Control Option2: Admission Control on NAS and ANX

NAS OLT ONTPONHGW

HGWANCP

IGMP 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 Control

Pass 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

IETF74 ANCP WG 21

Unified Video Resource Control Option2: Admission Control on NAS and ANX

NAS OLT ONUPONHGW

HGWANCP

IGMP 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 Control

Pass 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 State

Fail

Access Control

IETF74 ANCP WG 22

Unified Video Resource Control Option2: Admission Control on NAS and ANX

NAS OLT ONUPON

ONT

HGW

HGW

HGWANCP

PolicyServer

ApplicationServer

AdmissionRequest Admission Response

VoD Request

Admission Request

Admission Response

Subscriber B/Wand OLT Link B/WAdmission Control

Admission-Request { Bandwidth, Customer-Port-ID}

PON B/WAdmission Control

Pass Admission-Response { Customer-Port-ID}

BACK

IETF74 ANCP WG 23

Access Topology Discovery

NAS 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 ANCP OLT 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 ).

NAS OLTGPON

FedAN

PON

ONT HGW

HGW

HGW

ANCPHGW

DSL1

DSL2

DSLn

ANCP

BACK