Carrier Ethernet Academy - Quia · PDF fileCarrier Ethernet Academy MEF-CECP 2.0 Exam Preparation: ... Understand the CoS Labels and Names standardized in MEF ... Copyright 2013 The

Module 2 – Multiple Classes of Service

Copyright 2013 The Carrier Ethernet Academy Slide 1

Carrier Ethernet Academy

MEF-CECP 2.0 Exam Preparation: Module 2

Multi-CoS



Objectives for Module 2 Classes of Service

q  Understand the CoS Labels and Names standardized in MEF 23.1 q  Be able to relate a CoS to a bandwidth profile q  Know how many CoS types are supported per EVC and OVC q  Be able to list the 4 Performance Tiers

q  Understand how color marking is done



Review of MEF 23.1 Multi-CoS



CoS = Low EVPL PT 1

New Jersey Branch Office

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CoS = High

CoS = Medium

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EVPL PT 2

Multiple Classes of Service

q  Standard Classes of Service q  Standard Performance Tiers q  Standard Performance Objectives



E-Access Services enable Service Providers to extend their coverage and offer end to end services with standard performance objectives

American Service Provider

French Operator

Paris Branch Office

New York Headquarters

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Access EPL

Interconnect - E-Access Services

UNI

American Service Provider High Class Service PCP 4

ENNI High Class = PCP 5

4 5 6

French Operator High Class Service PCP 6

CoS = High

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UNI



Standard Classes of Service and Bandwidth Profile Constraints



CE 2.0 Standard Classes of Service

q  A CoS Label is a CoS Name standardized in MEF 23.1 q  Each CoS Label (H – M - L) has its own bandwidth profile constraints q  Single Class of Service supported per OVC q  Multiple Classes of Service per EVC

CoS Label Bandwidth Profile Constraints Example Applications

H High

CIR > 0 EIR ≥ 0 VoIP and Mobile Backhaul Control

M Medium

CIR > 0 EIR ≥ 0

Near-Real-Time or Critical Data Applications

L Low

CIR ≥ 0 EIR ≥ 0 Non-Critical Data Applications



Six Bandwidth Profile Parameters q  CIR: Committed Information Rate

q  CBS: Committed Burst Size q  CIR and CBS determine the amount of frames that must be

delivered per the service level objectives

q  If CIR > 0 then CBS must be > 0

q  EIR: Excess Information Rate

q  EBS: Excess Burst Size q  EIR and EBS determine the amount of frames that may

be delivered with no performance assurance

q  If EIR > 0 then EBS must be > 0

q  CM: Color Mode and CF: Coupling Flag q  Color Mode MUST be configurable in Color-Aware mode at the ENNI

q  Color Mode MUST be configurable in Color-Blind mode at the UNI

q  Coupling Flag 1 or 0

CIR EIR EBS

OVC

CIR CBS

ENNI



Bandwidth Profile Algorithm Function of Frame Length and Arrival Time

q  Service frame of length l arrives at time t

q  Is the frame length less than the number of tokens in bucket ?

q  YES: Declare frame conformant and remove the frame length worth of tokens from bucket

q  No: Declare frame non conformant

Conformance Color Service or ENNI Frame Delivery

CIR Conformant Green frames must be delivered per the SLS* performance objectives in the SLA*

EIR Conformant Yellow frames may be delivered but without performance assurance; not subject to SLS

None Red frames are discarded

Note 1: Bandwidth Profile Parameters: CIR, CBS, EIR, EBS, CM, CF

Note 2: Tokens are sourced at a fixed rate (CIR and/or EIR)

Note 3: Tokens go into a bucket with fixed capacity in bytes (CBS and/or EBS)

SLS: The set of performance objectives and parameter values of a specific service SLA: Contract between the Service Provider and the Subscriber specifying the agreed service level commitments and business agreements



Standard Performance Tiers and Performance Objectives



CE 2.0 Standard Performance Tiers q  MEF 23.1 describes Performance Tiers by using distances and

deriving the associated propagation delays q  PT1 (Metro Performance Tier)

q  Derived from typical Metro distances q  < 250 Km q  < 2 ms

q  PT2 (Regional Performance Tier) q  Derived from typical Regional distances q  < 1200 Km q  < 8 ms

q  PT3 (Continental Performance Tier) q  Derived from typical National/Continental distances q  < 7000 Km q  < 44 ms

q  PT4 (Global Performance Tier) q  Derived from typical Global/Intercontinental distances q  < 27500 Km q  < 172 ms



Per

form

ance

Met

rics

and

O

bjec

tives

Frame Delay (ms) ≤ 10 ≤ 20 ≤ 37 ≤ 25 ≤ 75 ≤ 125 ≤ 77 ≤ 115 ≤ 230 ≤ 230 ≤ 250 ≤ 390

Mean Frame Delay (ms) ≤ 7 ≤ 13 ≤ 28 ≤ 18 ≤ 30 ≤ 50 ≤ 70 ≤ 80 ≤ 125 ≤ 200 ≤ 220 ≤ 240

Inter-Frame Delay Variation (ms) ≤ 3 ≤ 8 or n/s n/s ≤ 8 ≤ 40 or n/s n/s ≤ 10 ≤ 40 or n/s n/s ≤ 32 ≤ 40 or n/s n/s

Frame Delay Range (ms) ≤ 5 ≤ 10 or n/s n/s ≤ 10 ≤ 50 or n/s n/s ≤ 12 ≤ 50 or n/s n/s ≤ 40 ≤ 50 or n/s n/s

Frame Loss Ratio (%) ≤ 0.01 ≤ 0.01 ≤ 0.1 ≤ 0.01 ≤ 0.01 ≤ 0.1 ≤ 0.025 ≤ 0.025 ≤ 0.1 ≤ 0.05 ≤ 0.05 ≤ 0.1

Performance Tier 4

H M L

CE 2.0 Standard Performance Objectives

Performance Tier 3

H M L

Performance Tier 2

H M L

Performance Tier 1

H M L

12 standard sets of

Performance Objectives



Standard Color Identifiers



CE 2.0 Standard Color Identifiers

q  Color Identifiers at the UNI when the CoS Identifier type is EVC or OVC EP

CoS Label CoS ID Types

Color Identifiers

C-Tag PCP DSCP

Color Green Color Yellow Color Green Color Yellow

H EVC or OVC EP 5, 3 or 1 N/S EF or

AF (10, 26 or 46) N/S

M EVC or OVC EP 5, 3 or 1 2 or 0 EF or

AF (10, 26 or 46)

AF (0, 12, 14, 28 or 30)

L EVC or OVC EP 5, 3 or 1 2 or 0 EF or

AF (10, 26 or 46)

AF (0, 12, 14, 28 or 30)



Service Frames Color Identifiers

Untagged Ethernet Frame

Single Tagged Ethernet Frame (C-Tag)

1 6

Destination MAC

1 6

Source MAC

1 2

Eth. type

1

FCS

3 2 1 4 . . . Payload . . . . . .

Customer Tag TPID (8100) C-VID PCP DEI

1 6

Destination MAC

1 6

Source MAC

3 4 1 2

C-Tag

2 1

Eth. type

1

FCS

3 2 1 4 . . . Payload . . . . . .



CE 2.0 Standard Color and CoS Identifiers

q  Color and CoS Identifiers using C-Tag PCP, DSCP or S-Tag PCP with or without DEI support

CoS Label

Class of Service and Color Identifiers

C-Tag PCP DSCP S-Tag PCP without DEI Support

S-Tag PCP with DEI Support

Color Green

Color Yellow

Color Green Color Yellow Color

Green Color Yellow

Color Green

Color Yellow

H 5 N/S EF (46) N/S 5 N/S 5, DEI 0 5, DEI 1

M 3 2 AF31 (26) AF32 (28)

or AF33 (30)

3 2 3, DEI 0 3, DEI 1

L 1 0 AF11 (10)

AF12 (12) or

AF13 (14) or

Default (0)

1 0 1, DEI 0 1, DEI 1



ENNI Frames Color Identifiers Untagged Ethernet Frame

Double Tagged Ethernet Frame (S-Tag + C-Tag)

Single Tagged Ethernet Frame (S-Tag)

1 6

Destination MAC

1 6

Source MAC

1 2

Eth. type

1

FCS

3 2 1 4 . . . Payload . . . . . .

Service Tag

1 6

Destination MAC

1 6

Source MAC

3 4 1 2

S-Tag

2 1

Eth. type

1

FCS

3 2 1 4 . . . Payload . . . . . .

Customer Tag Service Tag

TPID (88a8) S-VID PCP DEI

1 6

Destination MAC

1 6

Source MAC

3 4 1 2

S-Tag

3 4 2

C-Tag

1

Eth. type

1 2 1

FCS

3 2 1 4 . . . Payload . . . . . .

TPID (8100) C-VID PCP DEI

TPID (88a8) S-VID PCP DEI



Carrier Ethernet Academy

MEF-CECP 2.0 Exam Preparation: Module 2 Mobile Backhaul IA Phase 2



MEF Mobile Backhaul Implementation Agreement



Review of MEF 22.1 MBH IA Phase 2



Objectives for Module 2 Mobile Backhaul Phase 2

q  Understand the CoS model defined in MEF 22.1 q  Know which RAN technologies are supported q  Understand the protection requirements for a redundant connection q  Be able to describe the performance monitoring requirements

q  Describe the Maintenance Entity level that is used for S-OAM monitoring between the base station equipment and the controller equipment



MEF 22 Mobile Backhaul Implementation Agreement

q  Provides generic specification for the following Ethernet backhaul architectures

q  2G TDM

q  3G ATM, MPLS

q  4G Ethernet, MPLS

q  Provides requirements for

q  Services

q  Interfaces MEN

RAN BS

RAN NC

RAN BS

UNI

UNI

UNI



MEF 22 Use Cases 1a and 1b

Emulation over Carrier Ethernet - MEF 22 use case 1b

Packet offload over Carrier Ethernet - MEF 22 use case 1a

Carrier Ethernet Network

Legacy Network

Legacy Interface GIWF

RAN BS RAN NC

UNI UNI Ethernet Legacy

Interface GIWF

Ethernet

Carrier Ethernet Network

RAN BS RAN NC

UNI UNI

Legacy Interface GIWF

Legacy Interface

GIWF

Ethernet



Dual stack RAN - MEF 22 use case 2a

MEN

Legacy Network

RAN BS RAN NC

UNI UNI

All Ethernet - MEF 22 - Use Case 2b

MEN

RAN BS RAN NC

UNI UNI

MEF 22 Use Cases 2a and 2b



MEF 22.1 Mobile Backhaul IA Phase 2

q  Primary items

q  Support for LTE

q  Classes of Service Support

q  Performance recommendations

q  Support for Synchronous Ethernet

q  Service OAM recommendations

q  Protection enhancements



MEF Services for Mobile Backhaul q  E-Line, E-LAN and E-Tree Services

q  Allows combining multiple services on a single interface with service multiplexing

q  Enables multiple classes of service per EVC

!

!

!

!

!

!

EPL

EVPL

EP-LAN EP-Tree

EVP-LAN EVP-Tree



CoS Models for Mobile Backhaul Service Class

Name Example of generic traffic class mapping into CoS

4 CoS Model 3 CoS Model 2 CoS Model

Very High (H+) Synchronization - -

High (H) Conversational Signaling/Control

Synchronization Conversational

Signaling/Control

Synchronization Conversational

Signaling/Control Streaming Media

Medium (M) Streaming Media Streaming Media -

Low (L) Interactive Background

Interactive Background

Interactive Background

UNI EVC1

PCP1 Low

EVC2

Medium

High

PCP3

PCP5

Very High



MBH IA Phase 2 Timing Distribution Architectures

1588 PTP Synchronization

SyncE Synchronization

SONET/SDH Synchronization (Hybrid mode) MEN

RAN BS RAN NC

Legacy Network

RAN BS RAN NC

RAN BS RAN NC

1588 PTP Master 1588 PTP Slave

SyncE SyncE SyncE SyncE SyncE

Physical level synchronization

Physical level synchronization

Packet based synchronization



q  When the UNI consists of 2 links, the service provider can support link aggregation based on IEEE Std 802.3-2005 clause 43

q  Protection switching using active and standby links between the Customer Equipment (UNI-C) and Provider Equipment (UNI-N)

q  Other methods may be used if mutually agreed (ex: ITU-T G.8032/8031)

Active

Standby

UNI-C MEN UNI-N UNI-C UNI-N

Active

Standby

UNI Protection: Link aggregation IEEE Std 802.3-2005 clause 43

MBH IA Phase 2 Protection Requirements



q  Mobile backhaul service is from UNI to UNI q  Subscriber MEG allows the Mobile Operator to monitor the Mobile

backhaul service from UNI-C (RAN CE) to UNI-C (RAN CE) q  SOAM enabled on at least 2 Classes of Service q  SOAM FM (CCM, Loopback and Linktrace protocols) q  SOAM PM (FD, MFD, FDR, IFDV, FLR, Availability and Resiliency) q  Resiliency metrics HLI and CHLI utilized to characterize short term disruptions

MBH IA Phase 2 SOAM Requirements

MEN

RAN BS/RAN CE RAN NC/RAN CE

UNI UNI

Mobile Operator uses the Subscriber MEG for SOAM FM and PM



Mobile Backhaul Phase 2

q  4 CoS model defined in MEF 22.1 q  Support for LTE RAN technologies are supported q  Synchronous Ethernet support at the UNI physical layer q  LAG and “other” protection requirements for a redundant connection

q  SOAM performance monitoring requirements q  Subscriber Maintenance Entity level is used for S-OAM monitoring

between the base station equipment and the controller equipment

Documents

Carrier Ethernet Academy - Quia · PDF fileCarrier Ethernet Academy MEF-CECP 2.0 Exam Preparation: ... Understand the CoS Labels and Names standardized in MEF ... Copyright 2013 The