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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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 2
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 3
Review of MEF 23.1 Multi-CoS
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 4
CoS = Low EVPL PT 1
New Jersey Branch Office
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CoS = High
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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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 5
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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11;EPL PT 4
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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ENNI
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Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 6
Standard Classes of Service and Bandwidth Profile Constraints
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 7
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 8
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 9
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 10
Standard Performance Tiers and Performance Objectives
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 11
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 12
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 13
Standard Color Identifiers
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 14
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)
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 15
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 . . . . . .
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 16
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 17
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 18
Carrier Ethernet Academy
MEF-CECP 2.0 Exam Preparation: Module 2 Mobile Backhaul IA Phase 2
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 19
MEF Mobile Backhaul Implementation Agreement
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 20
Review of MEF 22.1 MBH IA Phase 2
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 21
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 22
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 23
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 24
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 25
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 26
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 27
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 28
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 29
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 30
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
Module 2 – Multiple Classes of Service
Copyright 2013 The Carrier Ethernet Academy Slide 31
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