REAL Ethernet Services - VUMS DataCom

REAL Ethernet Services 

Presentuje: 

Zdeněk Zapletal 

zdenekz@datacom.cz 

Reliable. Economical. 

Accountable. Limitless

Anotace 

• Ethernet is penetrating everywhere, from enterprise LAN to the 

carrier core network, in the metro and in the access networks 

as well. 

• Ethernet has its origin in providing LAN network connectivity 

and was not originally used to provide services by carrier and 

other operators. Although IEEE Ethernet protocol is still used, 

Carrier Ethernet differs from LAN-based Ethernet. 

• The Metro Ethernet Forum (MEF) is a global industry alliance 

that develops technical specifications and implementation 

agreements to promote interoperability and deployment of 

Carrier Ethernet. Its mission is to accelerate the worldwide 

adoption of Carrier-class Ethernet networks and services. 

10. Partnerský den VUMS DataCom 2

Anotace 

• The MEF has defined Carrier Ethernet as a ubiquitous, 

standardized, carrier-class Service and Network. MEF 

specified five attributes that distinguish Carrier Ethernet 

from familiar LAN based Ethernet: standardized services, 

reliability, scalability, quality of service and service 

management. 

• These requirements are turned into reality in a different way 

and in different extent by all important data communication 

vendors. 

• Carrier Ethernet services are carried over physical Ethernet 

networks and other legacy transport technologies. We want 

to share with you the vision of one of the leading suppliers of 

access solutions, RAD Data Communications, and describe 

how the company respond to this challenge. 


MEF Services Terminology 

Ethernet Private Line (EPL) is a Metro 

Ethernet service type defined by the MEF, 

providing a point-to-point Ethernet connection 

between a pair of dedicated User-Network 

Interfaces (UNIs). EPL is implemented as a 

point-to-point Ethernet Virtual Connection 

(EVC) which, unlike Ethernet Vitual Private 

Line (EVPL), does not allow for Service 

Multiplexing, i.e., a dedicated UNI (physical 

interface) is used to accept all service frames 

and map them to a single EVC. 

Ethernet Private Line (EPL) 

Port Based 

CE 

*UNI 

UNI 

*NNI 

NNI 

Carrier Ethernet 

Network 

Point-to-Point EVC 

CE 

UNI 

UNI 

Ethernet Virtual Private Line (EVPL) 

CE 

ISP 

POP 

Internet 

Ethernet Virtual Private Line (EVPL) 

service is very similar to a Ethernet Private 

Line (EPL) service, via a point-to-point 

Ethernet Virtual Connection (EVC) 

between a pair of User-Network Interfaces 

(UNIs).However, unlike EPL, EVPL allows 

for Service Multiplexing, i.e., multiple 

EVCs or Ethernet services per UNI. 

Service 

Multiplexed 

Ethernet UNI 

CE 

Service Based 

UNI 

NNI 

NNI 

Carrier Ethernet 

Network 

CE 

Multipoint-to-Multipoint EVC 

UNI 

UNI 

CE 


MEF Services Terminology 

Ethernet Private LAN (EPLAN) is a Metro Ethernet 

service type defined by the MEF, providing 

multipoint-to-multipoint Ethernet Virtual Connections 

(EVC) between User-Network Interfaces (UNIs). 

Because EPLAN services implement multipoint-tomultipoint 

EVC, multiple locations can be 

interconnected using an EPLAN service. EPLAN 

Metro Ethernet service does not permit service 

multiplexing at the User-Network Interface (UNI). 

Each location can be a member of one and only one 

EVC. If a given location requires connection to a 

second EVC, it will require a second UNI. 

Ethernet Private LAN (EPLAN) 

Port Based 

CE 

UNI 

UNI 

UNI 

CE 

UNI 

UNI 

UNI 

CE 

ISP 

POP 

Ethernet Virtual Private LAN (EVPLAN) 

Ethernet Virtual Private LAN (EVPLAN) is a 

service type defined by the MEF, permitting 

service multiplexing at the Ethernet User-Network 

Interface (UNI). Because in an EVPLAN service 

there are multiple EVCs per UNI, there is no need 

for additional UNI when overlapping multiple 

closed-user groups. 

Service 

Multiplexed 

Ethernet UNI 

CE 

Service Based 

UNI 

CE 

UNI 

UNI 

CE 


REAL Ethernet Access 

What does it mean 

Reliable 

Always on resilient connections with 4 or 5 nines 

24/7 E2E network management 

Automatic fault isolation 

QoS guarantees per class of service (CoS) 

Economical 

Accountable 

Limitless 

SOLUTION 

Cost-effective customer located equipment (CLE) 

High throughput, flexible and scalable data rates 

Minimal down-time for servicing and repair 

Service level agreements (SLA)-based performance commitments 

Granular data rates from 1 Mbps to 1 Gbps 

Versatile connectivity options 

Consistent service over any infrastructure 

Inteligent Demarcation Devices 


Demarcation Device - NTU 

(Network Termination Unit) 

EVC 

CPE ETX 

ETX CPE 

Operator B 

Operator A 

Customer Premises 

End-to-end OAM 


Points of Demarcation 

NTU = Customer Located Equipment (CLE) providing: 

• Clear demarcation between provider’s and Customer’s networks – quickly 

determine responsibility of service affecting problems 

• Operations Administration & Maintenance (OAM) 

Allow for end-to-end fault management and performance monitoring 

• Traffic management starting at customer premises 

• Service Level Agreement Monitoring 

Customers demand proof of the SLA contract 


Standard Ethernet OAM 


End-to-End Ethernet OAM 

Continuity Check, Loopback, Link trace 

• End-to-End OAM is defined in two standards 

• IEEE - 802.1ag defines Fault Management 

• Y.1731 – defines Fault Management and Performance Management 

New in ETX Version 3.8 

• Latest drafts are interoperable for Fault Management 

• Standard Fault Management 

• Loopback (LB)– Equivalent to IP Ping 

New in ETX Version 3.8 

• Link trace (LT) – Equivalent to IP Trace route 

• Continuity Check (CC)– Indication of connectivity (100msec) 

802.3ah (Access Link ME) 

CPE E-NTU 

E-NTU CPE 

Operator B 

Operator A 


802.1ag/ Y.1731 (UNI-N to UNI-N ME) 


• RAD’s Performance Management remains proprietary 

• Performance Monitoring is RAD Proprietary 

• Each EVC can be configured to be RAD Proprietary/Standard 

• On a RAD proprietary EVC still replies to LT and LB requests 


End-to-End OAM 

Continuity Check (CC) OAM 



CPE E-NTU 

E-NTU CPE 

CC Sink 

Operator B 

Operator A 

CC Source 

• Connectivity Check messages: 

CC OAM Frames 

• Defined per EVC, allows for one-way connectivity monitoring 

• Sent every 1 second (default) configurable for 100ms, 10 sec, 1 min & 10 min 

• Loss of Continuity (LOC) (only at the sink side) 

• LOC declared upon 3.5 seconds without receiving CC OAM frame 

• Loss of Continuity (LOC) is cleared upon sink side after receiving 2 CC OAM 

frames within a window of 3.5 seconds 

• Upon CC failure send trap and update active alarm log 



Loopback (LB) OAM 

CPE E-NTU 

E-NTU CPE 


Operator B 

LB OAM Request 

LB OAM Reply 

MEP = Maintenance-End-Point 

Operator A 

MIP = Maintenance-Intermediate-Point 

MEG = Maintenance Entity Group 


• Standard 802.1ag implementation 

• Defined per EVC, allows for non-intrusive 

loopback (round trip) connectivity 

monitoring, applies to OAM messages only 

• Sent from MEP, looped by either MEP or MIP 

• LB Failure is declared upon 2 seconds 

without receiving the specific LB OAM frame 

• Required for performance monitoring 

• Upon LB failure send trap and update alarm 

log 

Service OAM MEPs and MIPs 



Link Trace (LT) OAM 



CPE E-NTU 

Operator B 

Operator A 

E-NTU CPE 

LT Req 

LT Resp 

• Once a problem detected with CC or LB than LT can be used to 

pin point where the problem is 

• OAM is sent to the final MAC address and all nodes in the path 

that receive the LT request send back LT response, this way the 

failure point is found 

• Can be used also the resolve disputes when more than 1 

network is used 


End-to-End Ethernet OAM 

Applications 

Fault Detection with Connectivity 

Check (CC) Messages 

No CC within 3.5 sec interval -> RDI 

Fault Verification with Loopback 

Messages 

Fault isolation with Link Trace (LT) messages 

Provides L2 path as well as isolation 


Ethernet Demarcation Devices 

Variety of Ethernet Access Solutions 

Branch 

10BT 

Ethernet over PDH 

RICi-E1 

GFP 

GbE 

Ethernet over SDH 

ADM 

RICi-622GE 

RICi-622GE 

GbE 

Branch 

Branch 

10BT 

RICi-4/8E1 

MLPPP 

GbE 

RICi-155GE 

SDH 

STM1/4 

RICi-155GE 

GbE 

Branch 

EoPDH 

Branch 

RICi-16 

100BT 

GFP-VCAT 

Ethernet over Fiber 

ETX-202 

F.ETH 

GbE 

ADM 

SDH 

STM-1/OC-3 

GbE 

Egate 

Service Provider 

Packet Switched 

Network 

GbE 

GbE 

IPDSLAM 

IPDSLAM 

ASMi-54 

Ethernet over DSL 

EFM 

Bonding 

ATM 

LA-210 

LA-110 

ASMi-54 

F.ETH 

F.ETH 

Branch 

Branch 

Headquarters 

SHDSL.bis 

GbE 

ETX-202A 

GbE 

Metro 

Ethernet 

GbE 

•Extending the reach of the provider’s network 

over a variety of access technologies 

Branch 

•Consistent Ethernet service across different 

access technologies 


EtherAccess feature-set 

Enhanced L-2 Ethernet capabilities over any access infrastructure 

• EPL/EVPL services, partially EPLAN/EVPLAN (MEF certified) 

• Flow base 

• Traffic classification and mapping 

• CE VLAN ID, P-bit, DSCP, IP Precedence 

• Enhanced QoS 

• Policing per service (per flow) Dual leaky bucket supporting CIR+CBS, EIR+EBS 

• Scheduling – Queues according to Strict priority or WFQ 

• Rate limit on the egress port - Conforms egress traffic to specific rate 

• OAM 

• IEEE 802.3ah – Single Segment 

• IEEE 802.1ag – End-to-End 

• ITU-T Y.1731 – End-to-End 

EFM OAM Format 




Ethernet Access over Fiber 

ETX NTUs: Product Definition and Application 



EVC A 

ETX 

CPE 

CPE 

ETX-A 

Operator B 

Operator A 


EVC B 

ETX 

CPE 

End-to-end OAM between demarcation points 

• Clear demarcation between provider’s and Customer’s networks 

• OAM allow for E2E fault management and performance monitoring 

• Traffic management starting at customer premises 

• Prove of SLA contracts by continuous monitoring 



ETX NTU - Product Overview 

Product Physical Description Highlights 

ETX-102 V3.8 

Fast Ethernet 

NTU 

ETX-201 V3.8 

Gigabit & Fast 

Ethernet NTU 

ETX-202 V3.8 

Gigabit Ethernet 

NTU 

• Compact 1U, half 19” plastic enclosure 

• 1xFE Net, 1xFE Net/User, up to 4 FE User 

• Compact 1U, half 19” plastic enclosure 

• 1xGE Net, 1xGE Net/User, up to 4xFE user ports 

• Auto-detect GE/FE SFP Slots 

• Compact 1U, half 19”, metal enclosure 

• 2xGE Net, up to 4xGE user ports 

• Switching & Bridging 

• Ethernet OAM 802.3ah 

• Ethernet OAM 802.1ag 

• Standard PM per y.1731 

• SLA Monitoring 

• Uplink redundancy 

• L1 and L2 Loopback 

• Per VLAN Statistics 

• Serial Craft port 

• Configurable OOB mgt. port 

• Wide range of SFP 

• Temp. Hardened option 

• Standard wide range AC/DC 

48-220 PSU 

• Optional wide range DC 24-48 

PSU option 

• Dying Gasp Support 



ETX NTU - Product Overview 

Product Physical Description Highlights 

• Up to 4x GE SFP Optical Uplinks 

ETX-550 

GE Carrier Ethernet 

Aggregation 

• Up to 24x UTP 10/100 or 100 FE 

Optical User ports 

• Switching & Bridging 

Compact 1U or 1.5U, 19” 

• Redundant PSU AC or DC 



ETX NTUs: Performance Monitoring (PM) 

• Performance Monitoring Per EVC 

• up to 48* PM instances 

• Performance Monitoring (PM) OAM Availability 

• Traps can be defined per EVC per parameter with 

threshold 

• OAM PM Statistics 

• 15 minute intervals 


• Record of last 24 hours stored (96 cyclic intervals kept) 

• Additional PM (not OAM related) 

• Performance Measurements per port (RMON based RFC 

2819) such as dropped frames, oversize frames etc. 

• Traps with thresholds ‘Rising’ and ‘Falling’ thresholds 

definition 

* In VLAN stacking mode (Q-in-Q), 16 PM instances are available 



ETX NTUs:Fault Propagation Network Port to User Port 

CPE Switches to 

alternative path 

CPE 

Failure propagated 

to user port 

X 

E-NTU 

X 

Network port 

failure 

Packet Switched 

Network 

Eth/IP/MPLS 

• ‘Link down’ status on the Network port causes ‘link 

down’ status on the user port. 

• In case of multiple user ports, ‘link down’ status on 

all user ports or part of them according to parameter 

• ‘Wait to restore’ parameter - defines the time 

between network port becoming ‘up’ and restoring 

user port link 



ETX NTUs: Diagnostic Loopbacks 

• Layer 1 Loopback 

ETX loopbacks traffic from Rx to Tx 

• Out of service – disrupts service 

• Cannot traverse Ethernet bridge 

• Supported on any ETX port 

Tester 

• Performed on all traffic of the ETX port 

• Loopback activation is via 

management not OAM protocol 

No Layer L2 

Loopback 

• Layer 2 Loopback (at wire speed) 

ETX loopbacks traffic and swaps MAC 

Addresses 

• ETX replaces Source Address with 

Destination Address 

Tester 

ETX 

• Can traverse Ethernet bridges 

• Performed per VLAN (or EVC) 

With Layer L2 

Loopback 



Summary of ETX NTUs 

The ETX-202; ETX-201 & ETX-102 are state-of-the-art 

Carrier Ethernet Demarcation Device 

• Its enhanced capabilities include: 

• Complete OAM package with standard 802.3ah, 802.1ag and Y.1731 

• SLA enforcement from customer premises 

• Link redundancy 

• The ETXs positioned completely differently from media converters 

and enterprise switches 

• Its support for VLAN based EVC enabling deployment of E-Line 

and E-LAN services, allow service provider to improved their 

network utilization 

• Fault isolation and performance monitoring with layer 1 and layer 

2 loopback will dramatically lower OPEX 



ETX Supported Service Topologies Summary 

• EPL and EPLAN are supported by ETX products 

• EVPL and EVPLAN are supported with new ETX A series 




Ethernet Access over PDH 

RICi-E1/4E1/8E1/16E1, Egate-20/100 

•Egate Family: •RICi Family: 

•Egate-100 

•MIRICi-E1, MIRICi-E3 

•Egate-20 

•RICi-E1 

•RICi-4/8/16E1 

Egate-100 

Provider’s Node 

Egate-20 

FE 

E1/T1 

E1/T1 

n x E1/T1 


ETX-202 with 

MIRICi-E1/T1 

ETH 


RICi-E1/T1 

ETH 


RICi-4/8 

ETH 

PSN 

ETH/IP/MPLS 

GE 

FE 

Egate-100 

8 x E1/T1 

STM-1/OC-3/ 

3 x DS3 

n x E1/T1/ 

2 x DS3 

SDH/ 

SONET 

n x E1/T1 


RICi-16 

ETH 

RICi-16 


n x E1/T1 

RICi-16 

ETH 

Control Room 

RICi-E1 

RICi-4E1/8E1 

RICi-16 

MIRICi-E1 


Egate and RIC Main Features 

Demarcation Point between Carrier’s and Customer’s Networks 

• RICi and Egate provide a demarcation point between the private LAN 

and the operator’s PDH/SDH network 

• Enable service providers and ISPs to supply transparent Ethernet 

services, without interfering with user traffic 


RICi-E1 

• EPL Service 

Backup 

• Fault propagation 

LAN 

E1 

SDH 

E1 

LAN 

ETH Link 

is down 

AIS 

ETH Link 

is down 

• Flow control support at 100 Mbps 

• QoS 

• VLAN Priority (802.1p) 

• IP Precedence 

• New standard encapsulation: GFP (G.8040) 

• Extreme temperature: 

• -22–70°C (7.6–158°F) 

• 24 VDC metal box enclosure support extreme 

temperature 


RICi-4E1/8E1 

Physical Features 

• Ethernet 

• Copper: 4 or 2, 10/100 BaseT 

• Fiber Optic: 2, SFP-based 100 BaseFx 

• Network interfaces: 

• Up to 4 or 8 E1 unframed/framed 

• MLPPP bonding 

• Power Supply 

• AC/DC wide range 

• 24VDC 

• Temperature-hardened: -22–70°C (7.6–158°F) 


RICi-4E1/8E1 

Features 

• EPL Service 

• OAM & Diagnostics 

• 802.1ag/Y.1731 OAM 

• E1/T1 BERT 

• Fault propagation (bidirectional) 

• MLPPP link to Ethernet 

• Ethernet to MLPPP link 

• QoS (VLAN priority, DSCP, IP precedence, port based) 

• Management: 

• Secure Web session (SSL) 

• Secure Telnet session (SSH) 

• Radius authentication system

REAL Ethernet Services - VUMS DataCom

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