DPoE in MSO Network. SCTE Piedmont Chapter. Presented by Jorge Figueroa Sr. Systems Engineer

Transcription

1 DPoE in MSO Network SCTE Piedmont Chapter Presented by Jorge Figueroa Sr. Systems Engineer

2 Introduction to DPoE DPoE Defined Services Future Enhancements

3 What is DPoE DOCSIS Provisioning of EPON (DPoE ) is a joint effort of operators, vendors, and suppliers to support EPON technology using existing DOCSIS-based back office systems and processes.

4 A Brief Review of the DOCSIS Architecture OSS DHCP TFTP NMS CMTS VIDEO FEED VIDEO C O M B I N E FORWARD PATH OR DOWNSTREAM S P L I T FIBER NODE SERVICE AREA REVERSE PATH OR UPSTREAM C O M B I N E TV Modem COAXIAL CABLE REVERSE PATH FORWARD PATH 5MHz 42MHz 88MHz 860MHz 5MHz 65MHz 108MHz 862MHz

5 Cable Modem Initialization Process Summary > Internal Only CM scans for a downstream channel CM synchronizes to the downstream channel and locks on the timebase clock CM receives upstream parameters (UCD) from downstream messages CM receives upstream bandwidth allocation MAP CM performs upstream ranging CM establishes IP connection (DHCP) CM establishes Time of Day CM acquires configuration file (TFTP) CM registers with the CMTS CM is operational Optional Baseline Privacy Negotiation

6 A Comparison of EPON and DOCSIS Both EPON and DOCSIS are Point-to-Multipoint access networks They both allow two or more network elements to transmit on the same media using TDMA EPON uses fiber exclusively DOCSIS uses coax However, neither 1G-EPON nor 10G-EPON as specified in IEEE Std define any OAMP that allows forwarding of traffic between an ONU Interface (UNI) and the PON. One of the primary goals of the DPoE specifications is to provide an interoperable method of reaching the controller for the ONU, identifying the ONU capabilities, and providing that information to the OLT so that it can configure service on an ONU. The other is to adapt DOCSIS-based back office provisioning and operations models to EPON. This is the core objective of the DPoE specifications.

7 DPoE Architecture DOCSIS Provisioning and Management D M L E1/T1 STM-1 EPON OLT (C300) OLT vcms DPoE System 1490 nm Splitter 1 Gig EPON Architecture Splitter 1310nm 1310nm Splitter Home ONU ONU Home ONUPOTS SFU Home FE POTS Home Gateway /IAD POTS RF PC PHONE CATV FE POTS POTS WIFI/BLU E TOOTH PHONE PC PHONE CATV

8 Operations Support Systems Comparison DOCSIS DPoE

9 The DOCSIS Mediation Layer The DOCSIS Mediation Layer (DML) is the entity or process on the DPoE system that translates all DOCSIS specific management tools into EPON, some of its tasks are: Interprets the DOCSIS MIBs Creates virtual Cable Modems (vcms) for every ONU and requests IP addresses and configuration files for them. Translates the parameters received in the configuration file for each vcm to EPON OAM messages for the ONU. Keeping ONU software load up to date using the DOCSIS secure software download mechanism with digitally signed software images Provides a CLI that looks and feels like a CMTS

10 DPoE ONU Initialization Process DPoE ONU ranges and registers with OLT first, as mandated in the 802.3ah and 802.3av specifications DPoE system creates vcm for each newly discovered ONU vcm obtains IP parameters from the DHCP server, including configuration file name and TFPT server address Time of Day does not need to get established since vcms will synchronize to the DPoE system clock vcm obtains configuration file via TFTP ONU is then configured through OAM messages ONU is now successfully registered and vcm goes into Operational state

11 DPoE Service Flow Parameters The table details which parameters are applicable for an Upstream Service Flow, according to its configured Upstream Scheduling Service Type Best Effort (BE) column applies to IP HSD services Real Time Polling (RTP) column covers the business MEF services Other scheduling types (i.e. UGS) although currently not required in DPoE are also permitted.

12 Introduction to DPoE DPoE Defined Services Future Enhancements

13 DPoE Services and MEF Initial focus of DPoE is on business services. The majority of business services can be delivered using Ethernet. The foundation for all DPoE services is an Ethernet and VLAN-based forwarding model as described by MEF Ethernet is the least common denominator of all modern telecommunications services. In the access network, Ethernet can be used to deliver: Native Ethernet services (as defined by the Metro Ethernet Forum or MEF), or IP services transported over Ethernet. IP can, in turn, be used to deliver private IP (IP-VPN) services or public IP (Internet) services.

14 MEF Reference Architecture Subscriber Site Service Provider 1 Carrier Ethernet Network Service Provider 2 Subscriber Site UNI I-NNI E-NNI I-NNI UNI CE CE ETH UNI-C ETH UNI-N ETH E-NNI Ethernet Services Layer Terminology UNI: Interface between Public Service Provider Network and Customer Network E-NNI: Open Interface between Service Provider Networks [MEF-26] I-NNI: Open Interface between two network elements in the same Service Provider Network. EVC: The architecture construct that supports the association of UNI reference points for the purpose of delivering an Ethernet flow between subscriber sites across Carrier Ethernet Network. EVC carry traffic that belongs to MEF Carrier Ethernet Service instance Tagging/Encapsulation is used to isolate traffic that belong to different EVCs DPoE MEF Supports IEEE 802.1ad tagging and IEEE 802.1ah Encapsulation ETH E-NNI Ethernet Virtual Connection (EVC) ETH UNI-N ETH UNI-C

15 IEEE 802.1ad Tagging Also known as Provider Bridging (PB) Stacked VLANs 802.1ad allows multiple VLAN headers to be inserted into a single frame Inner tag is called C-Tag (Customer tag), Ethertype (TPID) 0x8100 (802.1Q) Outer tag is called S-Tag (Service tag), Ethertype (TPID) 0x88a8 (802.1ad) Other non-standard TPID values can be found in older equipment VLAN ID is 12 bits long (0-4095), remaining 4 bits are for QoS

16 IEEE 802.1ah Encapsulation Also known as: Provider Backbone Bridges (PBB) Mac-in-Mac Allows interconnection of multiple Provider Bridge Networks without losing each customer's individually defined VLANs PBB offers complete separation of customer and provider domains.

17 PBB Frame Structure B-Tag is the Backbone VLAN tag I-TAG contains: Ethertype 0x88e7 A 20 bit I-SID (Backbone Service Identifier) Other bits reserved, used for OAM,or QoS From a Provider Backbone Bridge perspective, everything after the I-TAG is just payload

18 Services Defined by DPoE v1.0 MEF services PB PBB Encapsulation mode Transport mode TPID translation (Optional) Encapsulation mode Transport mode IP (HSD) service

19 PB on DPoE - Encapsulation In this mode the ONU adds a Service Tag (S-Tag) to any incoming traffic from the customer (tagged or untagged): CPE D-ONU OLT MEF Network C-Tag(O) S-Tag C-Tag(O) S-Tag C-Tag(O)

20 PB on DPoE - Transport In this mode a DEMARC device before the ONU adds a Service Tag (S-Tag) to any incoming traffic from the customer (tagged or untagged). Alternatively, customer generates frames with two tags: DEMARC D-ONU OLT MEF Network C-Tag(O) S-Tag C-Tag(O) S-Tag C-Tag(O) S-Tag C-Tag(O)

21 PB on DPoE TPID Translation TPID Translation allows the OLT to modify the incoming TPID provided by the DEMARC or ONU and change it to another value (i.e. from 0x8100 to 0x88a8) Can be used in Transport or Encapsulation Mode DEMARC D-ONU OLT MEF Network S-Tag (TPID 1) C-Tag(O) S-Tag (TPID 1) C-Tag(O) S-Tag (TPID 2) C-Tag(O)

22 PBB on DPoE - Encapsulation In this mode the ONU adds the Bridge Source MAC, Bridge Destination MAC, and I-TAG to the beginning of the frame CPE D-ONU OLT MEF Network C-Tag(O) B-DA B-SA I-Tag C-Tag(O) B-DA B-SA I-Tag C-Tag(O)

23 PBB on DPoE - Transport The DEMARC device adds the Bridge Source MAC, Bridge Destination MAC, and I-TAG to the beginning of the frame. The ONU and OLT simply pass this traffic transparently DEMARC D-ONU OLT MEF Network B-DA B-SA I-Tag C-Tag(O) B-DA B-SA I-Tag C-Tag(O) B-DA B-SA I-Tag C-Tag(O)

24 IP HSD Service Through a DEMARC device An EVC is created between the DEMARC device and the OLT. Tags are removed by the OLT before entering the router in the DPoE System. EVC DEMARC D-ONU OLT Router IP Network DPoE System S-Tag C-Tag S-Tag C-Tag

25 IP HSD Service Through the ONU CMCI Interface The ONU encapsulates incoming untagged traffic using a dynamically assigned C- Tag/S-Tag pair. OLT then removes tags before entering the router in the DPoE System EVC CPE D-ONU OLT Router IP Network DPoE System S-Tag C-Tag

26 DEMARC Auto Configuration DEMARC devices are used to provision business services in existing MSO networks, typically connected to dedicated CWDM link There is strong drive to retrofit such devices with DPoE uplink (SFP ONU) for lower cost transport solution. The process of DEMARC service provisioning is currently fully manual and requires a truck roll every time service changes are needed (configuration is done manually on the DEMARC device at customer site) There is a strong drive for service configuration automation to allow operators to change provisioning on demand. The DEMARC Auto Configuration mechanism (DAC) process provides means for the automatic discovery, configuration of an in-band IP management service, and the discovery and transfer of a configuration file specific to the particular DEMARC that is discovered and connected

27 DAC Overview 1. DPoE ONU registers with DPoE System, EVC is established. This is the DEMARC Management EVC. 2. D-ONU sends LLDP (802.1AB) messages to DEMARC on UNI port. Parameters sent include: Bridge Type (PB, PBB) S-Tags and C-Tags if any (PB) I-Tags and B-Tag if any (PBB) 3. EVC now extends to DEMARC 4. DEMARC performs DHCP and obtains IP parameters and config file location 5. DEMARC downloads configuration file and configures ports and services EVC LLDP DEMARC D-ONU OLT Router IP Network DPoE System

28 Introduction to DPoE DPoE Defined Services Future Enhancements

29 DPoE/EPoC Complete Solution > Internal Only Business (DPoE/1G-EPON/10G-EPON) OLT FTTO Metro /SONET /PTN/MPLS FTTO Internet Splitter Mobile Backhaul (DPoE/ 1G-EPON/ 10G-EPON) Residential (DPoE/EPoC) GGSN RNC SGSN HLR MSC Server MGW Service Server Softswitch Metro /SONET /PTN /MPLS OC-3/T1 GE/10GE EVC OLT with embedded DML 1G/10G 1G/10G 1G/10G Splitter 1G-EPON/ 10G-EPON MDU T1 GE 1G-EPON/ 10G-EPON ONU CTBH BTS/NodeB FTTH IPTV DHCP TFTP DOCSIS Back-office Back-office sees ONU as CM TCP/IP DOCSIS Provisioning and Management CMC Splitter Coax 1G-EPON/10G-EPON ONT AMP CNU Phone PC IPTV Phone PC IPTV EPoC Back-office sees OLT as CMTS

30 PB/PBB/IP HSD Service Model CMCI LCI CMCI LCI S1+C1 S-ONU S2 S1+C2 S-ONU S2 DPoE System IP-SG1 S1 IP-SG2 S2 Router S X D MU-SI S3+C1 OLT PB S-ONU S3+C2 MN I-SID1 PBB DEMARC I-SID2 B-ONU IP Data Service IP Voice Service MEF Ethernet Service(PB) MEF Ethernet Service(PBB)

31 DPoE 2.0 Service Model CMCI LCI CMCI LCI S1+C1 S-ONU S2 S1+C2 S-ONU S2 DPoE System IP-SG1 S1 IP-SG2 S2 Router S X D MU-SI S3+C1 OLT PB VSI S-ONU S3+C2 MN I-SID1 PBB DEMARC I-SID2 B-ONU IP Data Service IP Voice Service MEF Ethernet Service(PB) MEF Ethernet Service(PBB) MEF Ethernet Service(PB+EoMPLS) MEF Ethernet Service(PBB+EoMPLS)

32 Features for Future DPoE versions (Tentative) FEATURES MPLS PE/VPLS IP-SG Auto-configuration ASP & MESP PacketCable Provisioning for Voice Services Multicast 1588v2 Precision Time Protocol for Ethernet Mobile Backhaul IPv6 IPDR Service OAM

33 Thanks!