ANCP%20Applicability%20to%20PON%20draft-bitar-wadhwa-ancp-pon-00.txt

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ANCP Applicability to PON draft-bitar-wadhwa-ancp
-pon-00.txt

• Nabil Bitar, Verizon
• Sanjay Wadhwa, Juniper Networks

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Agenda

• PON Specific Terminology
• Drivers for ANCP in PON based Broadband Networks
• Use Cases
• Proposal

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PON Specific Terminology

• PON
• Point to Multipoint fiber to the premise (or
  curb) network architecture in which unpowered
  splitters are used to split an optical signal on
  single optical fiber from CO to multiple premises
• Access Node Complex (ANX)
• The Access Node decomposed by two geographical
  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 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.

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Drivers for ANCP in PON based Broadband Networks

• 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. When acting as an intermediate agent, the
  OLT can encode PON-Customer-ID in the
  "Agent-Circuit-Identifier" Sub-option in
  Option-82 of the DHCP messages.

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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-2-end bandwidth optimized
  video delivery.
• Coordination also required between components of
  ANX (OLT and ONT) for optimized video delivery.
• Interaction needs to be real-time as services are
  requested via network or application level
  signaling.

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Use Cases

• Unified Video Resource Control
• Multicast Admission Control
• VoD Admission Control
• Multicast Conditional Access
• Access Topology Discovery
• Remote Connectivity Check

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High Level Communication Framework
ONT
HGW
HGW
NAS
OLT
ONT
PON
HGW
ANCP
ANCP
Control Request
Control Request
Control Response
Control Request
Admission Request
Admission Request
Admission Response
Admission Response
Information Request
Information Request
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Unified Video Resource Control Option1 All
control Centralized on NAS

• Access and admission control for multicast
  performed by NAS.
• IGMP from the subscriber 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 and a policy manager query).

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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

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Unified Video Resource Control Option1 All
control Centralized on NAS (cont.)
IGMP JOIN (S/, G)
Access Control Subscriber B/W, PON B/W and OLT
Link B/W based Admission Control
ANCP Replication Start ltS/,Ggt,
Customer-Port-ID
ANCP Replication Start ltS/,Ggt,
Customer-Port-ID
Multicast Flow (S,G) on Multicast VLAN
Multicast Flow (S,G) forwarded on unidirectional
ltMulticast GEM-PORTgt on the PON by OLT.
Multicast Flow (S,G) forwarded on
Customer-Port by ONT/ONU.
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Unified Video Resource Control Option1 All
control Centralized on NAS (cont.)
IGMP LEAVE (S/, G)
Admission Control ltResource Releasedgt
ANCP Replication Stop ltS/,Ggt,
Customer-Port-ID
ANCP Replication Stop ltS/,Ggt,
Customer-Port-ID
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Unified Video Resource Control Option1 All
control Centralized on NAS (cont.)
HGW
Application Server
VoD Request
Admission Request
Admission Response
ONT
Policy Server
Admission Response
HGW
Admission Request
OLT
ONU
NAS
PON
HGW
Subscriber B/W, PON B/W and OLT Link B/W based
Admission Control
ANCP
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Unified Video Resource Control Option2 All
control Centralized on NAS

• ANX (OLT and ONT) snoops IGMP to create
  replication state.
• ANX 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 do admission control for
  VoD.

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Unified Video Resource Control Option2 All
control Centralized on NAS
HGW
NAS
OLT
ONT
PON
HGW
ANCP
IGMP JOIN (S/, G)
IGMP Snooping
IGMP Snooping
Admission-Request Flow, Customer-Port-ID
Access Control
Access Control PON B/W Admission Control
Pass
Admission-Request Flow, Customer-Port-ID
Subscriber B/W OLT Link BW Admission Control
Admission-Reply-Pass Flow, Customer-Port-ID
Update Replication State
Admission-Reply-Pass Flow, Customer-Port-ID
Update Replication State
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Unified Video Resource Control Option2 All
control Centralized on NAS
IGMP JOIN (S/, G)
IGMP Snooping
IGMP Snooping
Admission-Request Flow, Customer-Port-ID
Access Control
Access Control PON B/W Admission Control
Pass
Admission-Request Flow, Customer-Port-ID
Subscriber B/W OLT Link BW Admission Control
Fail
Admission-Reply-Fail Flow, Customer-Port-ID
Release PON B/W Update Replication State
Admission-Reply-Fail Flow, Customer-Port-ID
Remove Replication State
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Unified Video Resource Control Option2 All
control Centralized on NAS
HGW
Application Server
VoD Request
Admission Request
Admission Response
ONT
Policy Server
Admission Response
HGW
Admission Request
OLT
ONU
NAS
PON
HGW
ANCP
Subscriber B/W and OLT Link B/W Admission Control
Admission-Request Bandwidth,
Customer-Port-ID
PON B/W Admission Control
Pass
Admission-Response Customer-Port-ID
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Multicast Conditional Access

• Two approaches for Network based Conditional
  Access
• Centralized on NAS. It could be triggered by
  admission request from ANX using ANCP.
• Distributed to ANX (OLT and ONT). White and
  Black lists provisioned on OLT and ONT by NAS
  using ANCP.
• Access to groups in the Black list dropped
  closest to the subscriber (on the ONT).
• Requests for group which are not blocked by Black
  list can be propagated upstream towards OLT and
  NAS for bandwidth based admission control.

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Access Topology Discovery
ONT
HGW
DSL1
HGW
OLT
GPON Fed DSLAM
NAS
DSL2
PON
HGW
DSLn
HGW
ANCP
ANCP

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

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Remote Connectivity Checks

• Triggered by a local management interface, the
  NAS can use the ANCP (Control Request Message) to
  initiate an Access Loop test between Access Node
  and HGW.
• On reception of the ANCP message, the OLT can
  trigger native OAM procedures defined for BPON in
  G.983.1 and for GPON in G.984.1.
• The Access Node can send the result of the test
  to the NAS via a Control Response message.

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Proposal

• Incorporate use-cases for ANCP as applicable to
  PON, and corresponding requirements for ANX and
  BNG, into the ANCP framework draft.
• Add protocol extensions, and corresponding
  handling on ANX and BNG for these use-cases to
  the protocol draft.

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Questions/Discussion
Thanks!