Connection-oriented Ethernet Attributes and Applications

Connection-oriented Ethernet Attributes and Applications

Ralph [email protected]

3Q09 Toronto Meeting

July 22, 2009

2Connection-oriented Ethernet Applications – 3Q09 Marketing Meeting – Toronto

Contents

• CLE and COE: 2 implementations of Ethernet

• COE Attributes

• COE Applications

Connectionless Ethernet (CLE)


Connectionless Ethernet (CLE) Challenges

• Ethernet switches forward frames to correct port based on destination MAC address (DA)

• If destination MAC address unknown, switches broadcast frames to all ports (called flooding)

• Flooding creates additional BW requirements on all links• Amount of flooding is not predictable

– DA becomes known by “learning”– DA becomes unknown when the bridges age out MAC table entries

in their memory ~ 5 minutes– Table entry will not age out if frames keep coming—but no one can

control this

Flooding plays havoc with QoS and resource reservationFlooding plays havoc with QoS and resource reservation


Flooding Simplified

DA = Destination Address

Multipoint EVC

DA=C

A B

C

CE CE

CE

DA=C

DA=C

Flooding: Destination MAC address has unknown destination port

Multipoint EVC

DA=C

A B

C

CECE

CE

DA=C

Destination MAC address has a known destination port

I know where C is (for now) Where is C again?


CLE Challenges: Spanning Tree Protocol

A B

C

CE CE

CECE

STPBlocked Link

D

A B

C

CE CE

CE CED

LinkFailure

Failover

New STPBlocked Link

STP: up to 2s protection switching speeds. Difficult provisioningSTP: up to 2s protection switching speeds. Difficult provisioning


Connection-oriented Ethernet (COE)

• Provides explicit definition of Ethernet paths– Disables Ethernet MAC address learning & flooding– Ethernet paths could be:

• End to end (EVC)

• Individual network segments

• Resource reservation and admission control per EVC per CoS– Per-connection (EVC/Path) traffic management and

traffic engineering

COE addresses the CLE challengesCOE addresses the CLE challenges


COE Supported Network Topologies / MEF Service Types

Ring(E-Line or E-Tree)Hub & Spoke

(E-Tree or Service Multiplexed EVPL)

E-Line

Linear

COE supports many topologies to support popular Ethernet servicesCOE supports many topologies to support popular Ethernet services

Mesh(E-Line or E-Tree)


EMS/NMS Plays Critical Role for COE

• COE does not use bridging control protocols– NMS used to provision VLAN “cross connects” and tunnels

• COE relies on EMS/NMS for – Setup working/protect traffic engineered EVCs or network

segments– Setup bandwidth profiles (CIR/EIR) with BW reservation

• CIR is really “guaranteed” like with SONET/SDH

– Other OAM function such as Fault Management

COE places more emphasis on the importance of the NMSCOE places more emphasis on the importance of the NMS


COE: The best of both worlds

SONET / SDH•Deterministic and precision QoS•Bandwidth reserved per STS / STM•99.999% Availability•Highest Security (L1 service)

Connectionless Ethernet•Layer 2 Aggregation•Statistical Multiplexing•Flexible Bandwidth Granularity•Cost Effectiveness

Connection-Oriented Ethernet•Layer 2 Aggregation and Statistical Multiplexing•Deterministic and precision QoS•Bandwidth reserved per connection•Flexible Bandwidth Granularity•99.999% Availability•Cost effectiveness•Highest Security

COE makes Carrier Ethernet more like a Layer 1 service COE makes Carrier Ethernet more like a Layer 1 service but with all the benefits of Layer 2 Ethernetbut with all the benefits of Layer 2 Ethernet


COE Key Benefits

AttributesAttributes BenefitsBenefits

Explicit Definition of Ethernet PathDeterministic, Predictable, Scalable, Secure

Resource Reservation and Connection Admission Control

Guaranteed SLA’s

Per Connection QoS and Traffic Engineering

Bandwidth ProfilesTiered Services

Robust Ethernet OAMComprehensive Monitoring and Troubleshooting

Carrier Class Service Protection < 50ms Protection / Restoration

11


Why COE ?

• Makes Ethernet more like SONET which has dominated the metro network– Network operations procedures similar to SONET– Smooth transition for SONET-trained operations personnel

• Easily scales to meet large scale metro connectivity and aggregation requirements

• Ideally suited for:– EoX Aggregation for handoff to service edge networks– Mobile Backhaul Networks– High Performance EVPL and EPL services

COE focus today: Service Delivery and Infrastructure in the MetroCOE focus today: Service Delivery and Infrastructure in the Metro


Different approaches to COE

• Ethernet-centric COE now being used in metro networks• MPLS-centric COE

– Standards being developed. – Proposed usage for interconnection of MPLS core routers

• Ethernet

MPLS-centric COE

Eth Eth

• Ethernet• MPLS Pseudowire (PW)• MPLS Label Switched Path (LSP)

VLAN TagSwitchingStatic PW T-MPLS MPLS-TP PBB-TE

Ethernet-centric COE

S-VLAN or PBB-TEEth EthMPLS LSP

PW PW

Ethernet-centric COE being deployed todayEthernet-centric COE being deployed today

COE Attributes


High Reliability•50ms Protection / Restoration

• G.8031•802.3ad Link Aggregation

Full Service Management•Link Fault Management

• 802.3ah•Service (EVC) Fault Management

• Y.1731, 802.1ag,

Security•Bridging disabled - no vulnerabilities•L2 DOS attacks mitigated•MAC DOS attacks mitigated

Standardized Services•EPL, EVPL, EP-Tree, EVP-Tree

• MEF 6, MEF 10.2

High Scalability•Millions of EVCs•Layer 2 Aggregation•Statistical Multiplexing

Deterministic QoS•Low Delay, Delay Variation, Loss

• Y.1731, 802.1ag, MEF 10.2•Bandwidth Resource Reservation

Attributes of Connection-oriented Ethernet

COECOEAttributesAttributes

COE is a high performance implementation of Carrier EthernetCOE is a high performance implementation of Carrier Ethernet


COE Security: Comparable to SONET

• Management VLANs isolated from Subscriber traffic– similar to DCN isolation from subscriber traffic in SONET networks

• With COE, MAC Address Learning / Flooding is disabled– MAC Address spoofing cannot occur– MAC table overflow DOS attacks cannot occur

• With COE, vulnerable Layer 2 Control Protocols (L2CPs) like STP are disabled– Protocol-based vulnerabilities (DOS attacks) are mitigated

• With COE, bridging is disabled so additional ports cannot be bridged to the point-to-point service – Traffic snooping cannot occur

COE provides security comparable Layer 1 (EoSONET) COE provides security comparable Layer 1 (EoSONET) but without any of SONET bandwidth utilization issuesbut without any of SONET bandwidth utilization issues


Ethernet OAM for COE

EVC1

EVC2

EVC3

Tunnel OAMEVC1, 2 and 3

Link OAMLink

Service OAMFLASHWAVE

CDS

FLASHWAVE

CDS

FLASHWAVE

CDS

MSC

StandardStandard Fault Fault ManagementManagement

Comparable to Comparable to SONETSONET

ITU-T Y.1731 / IEEE 802.1ag Tunnel Layer STS Path / VCG

ITU-T Y.1731 / IEEE 802.1ag Service (EVC) Layer VT1.5 or STS Path

IEEE 802.3ah Link (physical) Layer SONET Line

FLASHWAVE

CDS

COE leverages the complete set of Ethernet OAM standardsCOE leverages the complete set of Ethernet OAM standards


COE Attributes for Network Survivability

• IEEE 802.3ad Link Aggregation Groups (LAG)– For local (link level) diversity and protection– If any fiber or port in LAG fails, other LAG members share the load – Can implement 1:1 protection with working/protect LAG members

• ITU-T G.8031 Linear Path Protection– for EVC path diversity and sub-50ms path protection– Similar to SONET 1+1 UPSR path protection– Simple Provisioning: Setup Working path and Protect path– Independent of Network Topology

• Rings, Meshes, Multiple Rings and Linear Topologies

COE achieves high availability via multiple levels of protectionCOE achieves high availability via multiple levels of protection


COE Provides Dedicated Protection Switching

• Ethernet Linear Protection (ITU-T G.8031)– Dedicated protection resources– < 50ms protection switching time– Simple provisioning

LinkFailure Failover


Link and Path Protection Equivalency

CECE

SONET1+1

OC-N1+1

OC-N

1+1OC-192

UPSR

Ethernet1:1

LAG1:1

LAG

GE GE PEPEG.8031

1+1 OC-N 1+1 OC-N

10GE 10GE

10GE

1:1LAG

1:1LAG

PEPECECE

COE protection similar to SONETCOE protection similar to SONET

COE Applications


COE Application Categories

• Transport and Infrastructure– Layer 2 Aggregation to Service Edge Networks– Mobile Backhaul– Triple Play Residential Broadband Backhaul

• IPTV, Video on Demand, Internet Access, Voice

– Access to Network-based IP/MPLS VPNs– Access to MPLS Inter-Metro Core Network

• Service Delivery– Layer 2 connectivity services

• EPL and EVPL • EP-Tree and EVP-Tree

– Ethernet Internet Access (EIA)


COE for Layer 2 EoX Aggregation Infrastructure

23

SONET

EoSEoS

GbE/10GbE

EoFEoF

PDH Access Network

PDH Access NetworkNxDS-3

NxDS-1EoPDHEoPDH

OC-n

AggregationEoX Access

GbE/10GbE

Service EdgesCPE

COE for Ethernet Aggregation for all Service Edge NetworksCOE for Ethernet Aggregation for all Service Edge Networks

EoCuEoCu

Internet Access

VoIP/ IMS

IP VPN

MPLS Inter-Metro LD Core

MTSO

Video Serving Office

C

OE

Eo

X

Ag

greg

ation

N

etwo

rk Copper Access Network

Copper Access Network GbE

Switched Ethernet Services

EoEoλλ


Service Multiplexed

UNIUNIUNIUNIUNI

UNIUNIUNIUNI

UNIUNIUNIUNI

UNIUNIUNIUNI

COE COE NetworkNetwork

EVCEVC

EVCEVC

COE for Business Ethernet Services

EPL

UNIUNIUNIUNI

UNIUNIUNIUNI

UNIUNIUNIUNI

COE COE NetworkNetwork

EVCEVC

EVCEVC

EVPL

Service Service Provider Provider NetworkNetwork

EVCEVC

Wholesale Wholesale Access Provider Access Provider

NetworkNetworkUNIUNIUNIUNIUNIUNIUNIUNI E-NNIE-NNIE-NNIE-NNI

OVCOVC

Wholesale Ethernet Services

Retail Ethernet Services

COE COE


COE for Mobile Backhaul

• E-Line and E-Tree Service Types highly suitable for Mobile Backhaul Networks

Cell Sites

UNIUNIUNIUNI

MTSO

UNIUNIUNIUNI

COE Backhaul COE Backhaul Transport NetworkTransport Network

UNIUNIUNIUNI

UNIUNIUNIUNI UNIUNIUNIUNI

COE meets the stringent requirements of Mobile BackhaulCOE meets the stringent requirements of Mobile Backhaul


Summary

• COE is a high performance implementation of Carrier Ethernet– With added Security benefits

• COE provides a common metro EoX aggregation solution– for Ethernet access to all service edge networks

• COE facilitates the evolution of SONET metro transport networks to Carrier Ethernet– COE is operationally similar to SONET

COE Discussion

Connection-oriented Ethernet Attributes and Applications

Documents

coe coe

coe ethernetcentric

coe security

tunnels coe

etree coe

traffic engineering

b c ce ce ce da

c flooding