I nternational Telecom m unication Union ITU-T Highly Scalable Highly Scalable Ethernets Ethernets Paul Bottorff, Chief Architect, Carrier Ethernet, Nortel MEF VP, S ecretary, and Board Member IEEE P802.1ah Editor pbottorf@ nortel.com April 20, 2006 I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6
Agenda ITU-T o Introduction to Metro Ethernet service network o Toward an IEEE Ethernet Metro o Conclusions I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 2
I P and Carrier Ethernet are different things? ITU-T Ethernet is L2 and IP is L3, but: o • Both do packet switching • Both can scale globally • Both use dynamic topology protocols • Both can provide protection, QoS , and traffic engineering The fundamental difference is connectivity o • IP can provide global any-to-any connectivity • Carrier Ethernet can provide global connectivity between provisioned sets of network interfaces Carrier Ethernet is a global Virtual Private Ethernet o multiplexing technology IP is a global network technology o In the Enterprise and home IP runs over Ethernet networks o In the Metro IP will run over Carrier Ethernet Virtual Private o Networks I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 3
Carrier Ethernet I s a Netw ork Providing Many Virtual Private Ethernets ITU-T Each Virtual Private Ethernet is provisioned by the carrier o Traffic does not mix from one Virtual Private Ethernet to o another Each Virtual Private Ethernet is a carrier service instance o Metro Ethernet Forum is modeling Ethernet service instances o also called Ethernet Virtual Circuits (EVCs) Carrier Ethernet Network (or MEF MEN) I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 4
Basic Ethernet Service Types MEF Ethernet Virtual Connections ( EVCs) ITU-T Pt-Pt, Like E-LINE Duplex Ethernet Router Mesh Any-to-any MEF 10, 5 E-LAN MPt, Like VLAN, Any-to-any Multi-Site MEF 10, 5 Pt-MPt, Like E-TREE EPON Ethernet, Hub & Spoke Root-to-Leaf and MEF Phase 2 Leaf-to-Root Work in progress I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 5
MEF Reference Model ITU-T � Management Plane is deemed to be quite important � Management Plane is deemed to be quite important for carrier class Ethernet Service offering across for carrier class Ethernet Service offering across Metro Ethernet Networks (MEN) Metro Ethernet Networks (MEN) � Current focus is on both E<->W and N<->S OAM � Current focus is on both E<->W and N<->S OAM � UNI Type 2 work is focusing on Management � UNI Type 2 work is focusing on Management across the UNI across the UNI � EMS-NMS (MEF 7) have focused on N<->S OAM � EMS-NMS (MEF 7) have focused on N<->S OAM and have worked with TMF and have worked with TMF � OAM Protocol, OAM Requirements and Framework Management Plane � OAM Protocol, OAM Requirements and Framework have focused on E<->W OAM, and currently working have focused on E<->W OAM, and currently working with IEEE 802.1 and ITU-T Q5/13 with IEEE 802.1 and ITU-T Q5/13 Control Plane Application Services Layer (e.g., IP, MPLS, PDH, etc.) Data Plane � Provision for UNI Type 3 which is expected to � Provision for UNI Type 3 which is expected to focus on control aspects across the service focus on control aspects across the service interface i.e. UNI Ethernet Services Layer interface i.e. UNI (Ethernet Service PDU) � Specific Data Plane activities relate to Ethernet Transport Services Layer � Specific Data Plane activities relate to Ethernet (e.g., IEEE 802.1, SONET/SDH, MPLS) Service Definitions, where Services are defined Service Definitions, where Services are defined from a subscriber’s point of view. MEF 10, MEF 6, from a subscriber’s point of view. MEF 10, MEF 6, MEF 3 are related to data plane attributes. MEF 3 are related to data plane attributes. � Current work focused on phase II services � Current work focused on phase II services � UNI Type 1 IA is focusing on data plane � UNI Type 1 IA is focusing on data plane interoperability across the UNI interoperability across the UNI I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 6
MEF Services May be Realized by I EEE Provider Bridge Netw orks, MPLS Netw orks, or SONET ITU-T o All MEF services can be delivered by an IEEE Provider Bridge Network. o PDH, ATM, FR services are carried as a application over the EVC o E-TREE service type is part of ongoing MEF Phase 2 service work PDH, ATM, FR, Out of MEF Ethernet Virtual Circuit services order/ large MTU options E-LINE service E-LAN options VPLS VPWS IPLS MEF Application E-TREE Services I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 7
Agenda ITU-T o Introduction to Metro Ethernet service network o Toward an IEEE Ethernet Metro o Conclusions I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 8
I EEE Provider Backbone Bridge Netw ork ( 8 0 2 .1 ah) ITU-T Provider Backbone Bridge Network (802.1ah) 802.1ad Interfaces Provider Bridge Network (802.1ad) Provider Bridge Network (802.1ad) Provider Bridge Network (802.1ad) 802.1aj CFM(802.1ag) Runs End-to-end MRP(802.1ak) Runs in 802.1ad & 802.1ah I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 9
Eight Ethernet I nnovations ITU-T o Duplex Ethernet o Ethernet VLANs o Ethernet QoS o Multi-level Administrative Domains o Hierarchical Addressing o Ethernet VLAN Identifier S witching o Protection S witching o Point to point Ethernet Transport I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 0
Look Bob no CSMA/ CD! ITU-T Duplex and switched Ethernet have removed transmission o distance limits inherit in the original CS MA/ CD Ethernet IEEE 802.1 bridging is commonly thought of as part of Ethernet, o however is a different standard Half-Duplex 1973-80s half-duplex Cable-Tree using CSMA/CD Duplex Ethernet Early 90s move to duplex (point to point) no CSMA-CD Switched Duplex Ethernet Along with duplex Ethernet bridging became an integral part of Ethernet technology I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 1
Separate Finance and Engineering ITU-T New standards IEEE P802.1ad and P802.1ah are defining S ervice o VLAN (S -VLANs), extending tagging for S -VLANs (I-TAGs), and backbone tunnel VLANs (B-VLANs) Engineering In the Mid 1980 multiple Ethernets were run to isolate parts of the Finance business In the 1990s along with duplex and switched Ethernet Virtual Bridged Ethernet(VLANs) was invented Today virtual Bridged Ethernet is being expanded for Provider and Provider Backbone Bridging to allow nesting VLANs I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 2
Class based QoS for Ethernet ITU-T Ethernet of the 1980s was a best effort delivery network o However it became clear that not all information has the same o priority. Ethernet therefore began moving to provide ways to manage information differently for different user classes. This stated in the early 802.1p work, however is now continuing o on many fronts. The MEF 10 Phase 1 service specification has specified both o traffic meters and performance metrics for Ethernet The IEEE P802.1ad proj ect is working on extensions to the o original 802.1p code points to allow drop eligibility MEF services phase 2 provides QoS models for multipoint as well o as definitions for availability. S tandards work on bandwidth allocation is lagging o I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 3
Multiple Dom ain Managem ent ITU-T Ongoing work at IEEE (P802.1ag), MEF, and ITU S G13 (Y.1731) o IEEE P802.1ag S ervice OAM flows at multiple levels. o Ethernet S ervice OAM allows multiple autonomous networks. o Customer Service Provider Customer Eth Access Core Eth Access Customer Domain Provider Domain Operator Domain Operator Operator Domain Domain I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 4
W hat the Ethernet w orld is not flat? ITU-T Each IEEE 802.1ah level encapsulates frames with a new MAC o addresses and with a new service tag. Each IEEE 802.1ah nesting level summarizes the MAC addresses o of the lower level with a Backbone MAC address The higher level 802.1ah bridges forward on summarized o addresses allowing indefinite scaling without MAC lookup table explosion. IEEE P802.1ah Level B-DA B-SA B-TAG Client Data I-TAG FCS 3 Level B-DA B-SA B-TAG I-TAG Client Data FCS 2 Level C-DA C-SA S-TAG Client Data FCS 1 I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 5
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