Post on 23-Dec-2015
transcript
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 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