MEF-CECP Boot Camp
Module 1-1 Carrier Ethernet EVC Services Definitions
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 1
Course Overview









Introduction
Module 1 – Carrier Ethernet EVC Services
 1-1 Carrier Ethernet EVC Services Definitions
 1-2 Carrier Ethernet EVC Services Attributes
 1-3 User Network Interface (UNI)
 1-4 EVC Services Definitions Practical Exercises
Module 2 – ENNI and Carrier Ethernet OVC Services
 2-1 External Network-to-Network Interfaces
 2-2 Carrier Ethernet OVC Services Definitions and Services
Attributes
 2-3 OVC Services Definitions Practical Exercises
Module 3 - Circuit Emulation, Synchronization and Mobile Backhaul
Module 4 – Service OAM Fault and Performance Management
Module 5 - Carrier Ethernet Transport and Protection Technologies
Module 6 - Carrier Ethernet Access Technologies
Module 7 – CE 2.0 Equipment and Services Certification
Module 8 - MEF CECP Boot Camp Course Review
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 2
Ethernet 101
Networking Fundamentals
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 3
Circuit Switched / Packet Switched
Circuit switching model is dedicated connections between a sender and a
receiver across the network



For example a phone call between two people
The connection is established after dialing the number
It remains established for the duration of the call (whether people are talking
or not)
Packet switching does not require a circuit to be created, rather the network
delivers each packet based upon the address



For example sending packages from one place to another
Each package is addressed to the destination
No resources are required unless packages are being sent
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 4
The Aloha Net


Norm Abramson’s invention to link all the islands using
a common satellite channel (carrier)
Packet switching enabled addressing individual
communications sessions to any island
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 5
Sounded like a Good Idea
 Ethernet was developed during the 1970s at the
Xerox Palo Alto Research Center (PARC)
 Inventors were Bob Metcalfe and Dave Boggs
 Based upon the Aloha Net
 Early Ethernet at PARC was a 2.44Mbps LAN
 Ethernet was first commercialized in 1981 by a
consortium of Digital Equipment Corporation (DEC),
Intel, and Xerox (DIX Ethernet)
 The first 802.3 standard
in 1983 was 10Mbps
 Used “Thicknet” COAX cable
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 6
The OSI 7 Layer Model
7
Application
6
Presentation
5
Session
4
Transport
3
Network
2
DataLink
1
Physical
Upper Layers
Application oriented
“End-to-End”-Layers
Lower Layers
Network oriented
“Hop-by-hop” layers
The Open Systems Interconnect Model
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 7
IEEE 802.3 Ethernet
 Ethernet is both a Physical Layer and a Datalink
Layer
 The Physical Layer defines each of the different
types of physical media that transport Ethernet
frames
 Each copper and fiber interface/media that carries Ethernet
is defined in 802.3
 The Datalink Layer (which includes the Media Access
Control or MAC layer) describes the frame format,
the address format and structure, and the rules for
transmitting and receiving packets
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 8
Ethernet in the Beginning
 The first commercial Ethernet implementation was based
on coaxial “thick-net” cable
 Originally operated at 2.4Mbps – 10x faster than a
2400baud modem
 Standardized by IEEE 802.3 at 10Mbps
 With a maximum distance of 2500 meters (five 500 meter
segments connected by repeaters)
…
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 9
Ethernet Local Area Network
Ethernet LAN Segment
…

Each station has a unique MAC address

MAC service delivers Ethernet frame from one MAC address to another


Unicast – from one station to another station

Multicast – from one station to multiple other stations

Broadcast – from one station to all other stations
In order to find a destination the sources broadcast and the destination
responds, thereafter source sends only to that destination
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 10
Basic Ethernet Frame Format
Destination
MAC
1
.. .
Source
MAC
61
.. .
Eth.
type
612 1
...
Payload
FCS
1500 1 2 3 4
 The frame starts with the 6 byte Destination Address (DA) followed by the
Source Address (SA). The DA can be UNICAST, MULTICAST, or BROADCAST.
 The EtherType of information/protocol in the payload is indicated by the Ether
Type field (ET): (e.g. 0x0800=IPv4, 0x0806=ARP, 0x86DD=IPv6).
 The Payload field contains the actual client data. For an IP packet this starts with
the IP Header. The IP Header would then be followed with a UDP or TCP or
ICMP header and then the data. The Payload field must be at least 46 bytes
long or it must be padded to 46 bytes.
 The Frame Check Sequence (FCS) is a CRC-32 computed over the whole frame
(except the CRC) and can detect all error bursts up to 32 bits long.
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 11
Evolution of Ethernet
 Ethernet evolved in terms of media and speed
 Media: From coax to twisted pair to fiber
 Speed: From 10M100M1G10G40G100G
 One of the most important innovation for Ethernet was
the development 10BASE-T
 The “T” being twisted pair cabling commonly found in offices and
used for phone and serial terminal (eg IBM 3270) connections
 With separate transmit and receive channels, Ethernet
was on its way to becoming a WAN technology as well
as a LAN technology
 Optical Ethernet on fiber continued this trend
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 12
Ethernet Switching (Bridging)
 Ethernet Bridges were invented in the mid 1980s as Ethernet
networks grew
 Initially, Ethernet Bridges had two purposes:
 Extended the reach of Ethernet (beyond 2500m)
 Reduce the number of stations and the amount of traffic on each
segment to reduce collisions.
 Ethernet Bridges are “Learning Bridges” which is how they
reduce traffic. They perform four functions: Learn, Forward,
Flood, Discard
Note: Multi-port Bridge = Switch
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 13
Flood/Learn/Forward/Discard
 Station 1 sends a frame to station 2
 Station 2 is unknown, so bridge floods frame to ports
12 and 48
4
5
 Station 1 Source MAC address is learned on port 7
 Station 2 sends a frame to station 1
Port 12
 Station 1 is known so bridge forwards frame to port 7
only
 Station 2 Source MAC address is learned on port 48
Port 7
Port 48
 Station 3 sends a frame to station 1
 Station 3 Source MAC address is learned on port 7
 Bridge discards frame
 Station 4 sends a frame to station 5
1
3
2
 Bridge floods frame to ports 7 and 48
 Station 4 Source MAC address is learned on port 12
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 14
6
10BASE-T Changed Bridging
 Before 10BASE-T, Ethernet Bridges had a small
number of ports (2, 4, maybe 8) because each port
was a shared LAN with many stations
 With 10BASE-T (and subsequent point-to-point
Ethernet connections) the bridge is the network
 The bridge is the connection between stations.
Switches are really 8, 16, 24, 32, 64 etc. port bridges
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 15
Virtual LANs
 VLANs were added by the 802.1Q project
 Enables bridges to support 4094 separate Ethernet
service instances
 VLANs create “virtual” segments by using VLAN tags to
group stations together into separate broadcast domains
or segments
 Traffic on one VLAN is not visible to other stations on
other VLANs
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 16
VLAN Tagged Ethernet Frame
Single Tagged Ethernet Frame (C-Tag)
Destination
MAC
1
.. .
Source
MAC
61
C-Tag
.. .
Eth.
type
6123412 1
...
Payload
FCS
1500 1 2 3 4
Customer Tag
D
TPID (8100) PCP E
C-VID
I
16 bits
3 bits 1
12 bits
The tag is 4 bytes long (32 bits) and has 4 fields:
-TPID (Tag Protocol ID) = 8100 indicates that this is a C-tag
- PCP (Priority Code Point) indicates class of service
- DEI (Discard/Drop Eligibility Indicator)
- C-VID (VLAN ID) specified the VLAN (0-4095)
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 17
Local / Metro / Wide Area Networks
LAN: Local Area Network
•LANs
are usually confined to one building or a group of buildings
•The most common type of LAN is Ethernet
MAN: Metro Area Network
•Metro Area
Networks span a city, a region or a country
•The most common type of Metro Area Network is Ethernet
WAN: Wide Area Network
•WAN
exist over a large area
•The world’s largest Wide Area Network is the Internet
LOCAL
AREA
NETWORK UNI-C
METRO
AREA
NETWORK
UNI-N
METRO
AREA
NETWORK
ENNI-N
ENNI-N
UNI-N
LOCAL
AREA
UNI-C NETWORK
WIDE AREA NETWORK
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 18
Ethernet Frame Formats
Untagged Ethernet Frame
Destination
MAC
1
.. .
Source
MAC
61
.. .
Eth.
type
612 1
Payload
...
FCS
1500 1 2 3 4
Single Tagged Ethernet Frame (C-Tag or S-Tag)
Destination
MAC
1
.. .
Source
MAC
61
.. .
C-Tag Eth
S-Tag type
6123412 1
Payload
...
FCS
1500 1 2 3 4
Double Tagged Ethernet Frame (S-Tag + C-Tag)
Destination
MAC
1
.. .
Source
MAC
6 1
.. .
Eth.
S-Tag C-Tag
type
612341234 1 21
FCS
1500 1 2 3 4
Customer Tag
Service Tag
TPID (88a8)
...
Payload
PCP DEI S-VID
TPID (8100)
PCP DEI C-VID
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 19
The OSI Model
7
Application
6
Presentation
5
Session
4
Transport
3
Network
2
DataLink
1
Physical
Upper Layers
Application oriented
“End-to-End”-Layers
Lower Layers
Network oriented
“Hop-by-hop” layers
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 20
OSI Model and the Internet
 The Internet loosely follows the OSI Model
 Layer 7: Application (e.g. HTTP web service, VoIP, IP Video)
 Layer 5/6: Session/Presentation protocols (non std)
 Layer 4: Transport (e.g. TCP, UDP)
 Layer 3: Network (IP)
 Layer 2: Data link (Ethernet)
 Layer 1: Physical (Fiber, twisted pair copper, microwave,
etc.)
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 21
Hop-by-hop layers
 At the lower layers, devices share access to
the same physical medium
 Devices communicate directly with
neighbouring devices over link or “hop”
 Information moves one hop at a time, getting
closer to the destination at each hop
 Connectionless IP Routers make hop by hop
decisions
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 22
End-to-end layers
 Upper layers are “end-to-end” connecting the client to
the server
 Applications/Protocols at the two ends seem to
communicate directly to each other
 They are unaware of the details of how their messages
are transmitted
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 23
Layer Interaction: TCP/IP Model
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 24
Frame, Packet, Datagram
 Different names for packets at different layers
 Ethernet (link layer) frame
 IP (network layer) packet or datagram
 TCP (transport layer) segment
 Terminology is not strictly followed
 The term “packet” can be used to describe a message at any layer
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 25
Encapsulation
Each layers adds a header to the data/payload
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 26
MEF Architecture Model
UNI: User Network Interface

The physical demarcation point between the responsibility of the Service
Provider and the responsibility of the Subscriber
ENNI: External Network to Network Interface

The demarcation point between two operators
EVC: Ethernet Virtual Connection
An association of two or more UNIs that limits the exchange of Service
Frames to UNIs in the EVC

OVC: Operator Virtual Connection

An association of OVC End Points at External Interfaces within the same CEN
UNI-N
UNI-C
UNI-N
UNI-C
ENNI-N
ENNI-N
UNI-N
UNI-C
OPERATOR
CEN
OPERATOR
CEN
OVC
OVC
EVC
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 27
Service Frames vs ENNI Frames
Service Frames - An Ethernet frame transmitted across the UNI toward
the Service Provider or an Ethernet frame transmitted across the UNI
toward the Subscriber
ingress
egress
UNI
ingress
Operator A
ENNI
Operator B
egress
UNI
ENNI Frames – An Ethernet frame sent from one Operator CEN
across the ENNI to another Operator CEN
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 28
Ethernet Services over MAN/WAN
 Transport protocols such as MPLS, Provider Bridging, SONET/SDH or
OTN/DWDM are commonly used to connect remote Ethernet LANs using
MEF defined Carrier Ethernet Services
 MEF defines Point-to-Point and Multipoint Services delivered using
connection-oriented or connectionless transport protocols
Ethernet
LAN 2
Ethernet
LAN 1
Ethernet
Switching
Transport Protocol
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Ethernet
Switching
Slide 29
Point-to-Point Services
CE-VLAN ID / EVC Map
at UNI 1
CE-VLAN ID
EVC
All
EVC 1
CE-VLAN ID / EVC Map
at UNI 2
UNI 1
EVC 1
UNI 2
CE-VLAN ID
All
EVC
EVC 1
Point-to-point services DO NOT require MAC learning capable transport
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 30
Multipoint Services
CE-VLAN ID / EVC Map
at UNI 2
CE-VLAN ID
EVC
All
EVC1
UNI 2
CE-VLAN ID / EVC Map
at UNI 1
CE-VLAN ID
EVC
UNI 1
All
EVC1
EVC 1
UNI 3
CE-VLAN ID / EVC Map
at UNI 3
CE-VLAN ID
EVC
All
EVC1
Multipoint services provide connectivity between multiple end points
Include both multipoint-to-multipoint (E-LAN) and rooted multipoint (E-Tree)
Multipoint services require MAC learning capable transport
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 31
Carrier Ethernet
Services Definitions
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 32
MEF EVC Services Specifications
MEF 10.3
Ethernet Services Attributes Phase 3
Purpose
Defines Services Attributes and Parameters required to offer the
Services defined in MEF 6.2
MEF 6.2
Ethernet Services Definitions Phase 3
Purpose
Defines Ethernet Service types; E-Line, E-LAN and E-Tree
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 33
Ethernet Service Definition Framework
 An Ethernet Service is the concatenation of the following:
 Ethernet Service Type +
 Ethernet Service Attributes +
 Ethernet Service Attribute Parameters
Ethernet
Service
Type
+
Ethernet
Service
Attributes
+
Ethernet
Service
Attribute
Parameters
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
=
MEF
Service
Definition
Slide 34
MEF Ethernet EVC Service Model
 User Network Interface (UNI)
 Physical demarcation point between the responsibility of the Service
Provider and the responsibility of the Subscriber
 Subscriber attaches to the CEN at the UNI
 Subscriber sends and receives Service Frames to and from the CEN
 Service Frames format must be standard IEEE 802.3 Ethernet Frames
 Ethernet Virtual Connection (EVC)
 An association of two or more UNIs that limits the exchange of Service
Frames to UNIs in the EVC
CEN
UNI
EVC
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
UNI
Slide 35
EVC and Ethernet Service Types
E-Line Services
UNI
Use point-to-point EVCs
UNI
Point-to-Point
EVC
UNI
UNI
E-LAN Services
Multipoint
EVC
UNI
UNI
Use multipoint-to-multipoint EVCs
UNI
UNI
leaf
E-Tree Services
Use rooted-multipoint EVCs
UNI
leaf
UNI
root
Rooted Multipoint
EVC
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
UNI
leaf
Slide 36
Private and Virtual Private Services
 Each Service type supports both a Private and a Virtual Private
service definition
 All to One Bundling creates Port-based or Private services
 Service Multiplexing and/or Bundling are VLAN-based or Virtual
Private services
Service Type
Port-Based
(All to One Bundling)
VLAN-Based
(EVC identified by VLAN ID)
E-Line
Point-to-point EVC
EPL
Ethernet Private Line
EVPL
Ethernet Virtual Private Line
E-LAN
Multipoint-to-Multipoint EVC
EP-LAN
Ethernet Private LAN
EVP-LAN
Ethernet Virtual Private LAN
E-Tree
Rooted-Multipoint EVC
EP-Tree
Ethernet Private Tree
EVP-Tree
Ethernet Virtual Private Tree
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 37
All to One Bundling
 ALL customer traffic is bundled to ONE EVC
 Untagged
 Priority tagged (CE-VLAN ID 0)
 Tagged (CE-VLAN IDs 1 to 4095)
 ONE service is created on the UNI
 All to One Bundling creates a Port-based service
 All to One Bundling cannot be combined with VLAN-based
Service Multiplexing or Bundling attributes
CE-VLAN ID / EVC Map
CE-VLAN ID
All CE-VLAN IDs
Untagged
Priority Tagged
CE-VLAN ID / EVC Map
CEN
EVC
UNI
EVC
BlueCE-VLAN ID
UNI
All CE-VLAN IDs
EVC
Untagged
Priority Tagged
Blue
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
EVC
Blue
Slide 38
Bundling
 Multiple (more than one), but not all CE-VLAN IDs are bundled
to one EVC
 Bundling is a VLAN-based service attribute and can be used in
conjunction with Service Multiplexing
CEN
CE-VLAN ID / EVC Map
CE-VLAN ID
EVC
20, 21, 40
Blue
UNI
EVC
Blue
CE-VLAN ID / EVC Map
UNI
CE-VLAN ID
EVC
20, 21, 40
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
EVC
Blue
Slide 39
Service Multiplexing
 The UNI is shared between multiple services
 Each service must have at least one CE-VLAN ID mapped to it
 Service Attribute that can be used with VLAN-based services
 Service Multiplexing can be combined with Bundling
 Each EVC can have multiple CE-VLAN IDs bundled to it
CE-VLAN ID / EVC Map
CE-VLAN ID
EVC
910, 911
Blue
CE-VLAN ID / EVC Map
CE-VLAN ID
EVC
17
Grey
Blue
CE-VLAN ID / EVC Map
UNI
EVC
UNI
CEN
EVC
CE-VLAN ID
EVC
EVC
910, 911
Blue
17
Grey
UNI
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 40
Multiplexing Different Services
 Service Multiplexing allows different EVC services such as
EVPL, EVP-LAN and EVP-Tree to be delivered on a single UNI
as long as they are all VLAN-based services
CEN
UNI
EVC
UNI
EVC
UNI
EVC
UNI
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 41
Port-Based Services
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 42
EPL Service
 Point-to-point, port-based EVC service
 All to One Bundling enabled at the UNI
 Simplifies deployment by separating services on individual UNIs
 Easier to troubleshoot, outages confined to one service per port
 Very transparent, no manipulation of CE-VLAN IDs
CEN
UNI
EVC
UNI
Customer
Edge
Customer
Edge
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 43
EPL Service Example
 Enterprise with headquarters and regional office
 10 Mbps EPL replaces 1.5 Mbps TDM private line
 10 Mbps EPL replaces 1.5 Mbps TDM private line for internet access
 Separate UNIs are required at headquarters for each service
UNI
EVC
Customer
Edge
UNI
CEN
UNI
Headquarters
EVC
UNI
Internet Service
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 44
EP-LAN Service
 Multipoint-to-multipoint, port-based EVC service
 All to One Bundling at the UNIs
 Very transparent, no manipulation of CE-VLAN IDs
 EP-LAN is less transparent than EPL because forwarding is
based on learned addresses
UNI
Customer
Edge
UNI
Customer
Edge
CEN
EVC
UNI
Customer
Edge
UNI
Customer
Edge
UNI
Customer
Edge
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 45
EP-LAN Service Example
 Distributed Enterprise-wide connectivity
 1 Gbps EP-LAN connection between the five sites
 Replaces multi-point IP-VPN and ATM Transparent LAN Service
UNI
Customer
Edge
UNI
Customer
Edge
CEN
EVC
UNI
Customer
Edge
UNI
Customer
Edge
UNI
Customer
Edge
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 46
EP-Tree Service
 Rooted-multipoint, port-based EVC service
 All to One Bundling at the UNIs
 Simpler than typical hub & spoke configuration using multiple EPLs
 Hubbing function performed by the root UNI
Leaf
CEN
UNI
Leaf
Root
UNI
Customer
Edge
Customer
Edge
EVC
Customer
Edge
UNI
UNI
Leaf
Customer
Edge
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 47
EP-Tree Service Example
 Residential services using EP-Tree
 Service definition resulting from MSOs and cable operators
 Root node can send and receive traffic to and from any Leaf node
 Service Frame transport from one Leaf to another is prohibited
Leaf
CEN
UNI
Leaf
Root
UNI
Customer
Edge
Customer
Edge
EVC
UNI
Customer
Edge
UNI
Leaf
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Customer
Edge
Slide 48
VLAN-Based Services
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 49
EVPL Service
 Point-to-point, VLAN-based service
 Replaces Frame Relay point-to-point services
 Allows Service Multiplexing and/or Bundling at the UNI
Customer
Edge
UNI
EVC
UNI
CEN
EVC
Headquarters
UNI
Internet Service
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 50
EVPL Service Example
 Enterprise with headquarters and regional office
 10 Mbps EVPL replaces 1.5 Mbps Frame Relay circuit
 10 Mbps EVPL replaces 3 Mbps Frame Relay dedicated internet
access
 Single UNI required at headquarters to support multiple services
Customer
Edge
UNI
EVC
UNI
CEN
EVC
Headquarters
UNI
Internet Service
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 51
EVP-LAN Service
 Multipoint-to-multipoint, VLAN-based service
 Replaces multi-point IP-VPN and ATM Transparent LAN
Services
 Allows for Service Multiplexing and Bundling
UNI
UNI
Headquarters
CEN
EVC
UNI
Internet Service
EVC
UNI
Customer
Edge
Customer
Edge
UNI
Customer
Edge
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 52
EVP-LAN Service Example
 Distributed Multi-Service Connectivity
 10 Gbps connection between sites
 5 Gbps multipoint-to-multipoint connection between all LANs (blue)
 5 Gbps enterprise-wide access to Internet direct from provider (grey)
UNI
UNI
Headquarters
CEN
EVC
UNI
Internet Service
EVC
UNI
Customer
Edge
UNI
Customer
Edge
Customer
Edge
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 53
EVP-Tree Service
 Rooted-multipoint, VLAN-based service
 Simpler than hub and spoke configuration using multiple EVPLs
 Hubbing function performed by the root UNI
 Service Frame transport from one Leaf to another is prohibited
Leaf
CEN
UNI
Customer
Edge
Root
UNI
EVCs
Customer
Edge
UNI
Leaf
Content provider
UNI
Leaf
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Customer
Edge
Slide 54
EVP-Tree Service Example
 Triple-play residential services
 Video, voice and internet over a single UNI with 3 different EVCs to
provide service isolation
 Typical topology for cable operators and residential broadband
providers
 Supports PON access networks
CEN
Leaf
Customer
Edge
UNI
Root
UNI
Customer
Edge
UNI
EVCs
Leaf
Content provider
UNI
Leaf
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Customer
Edge
Slide 55
EVC Service Computer
STEP 1
All to One
Bundling?
YES
Port-Based
Private
Service
VLAN-Based
Virtual Private
Service
Multiplexing
And/or Bundling
May apply
STEP 2
STEP 2
Number of UNIs?
Number of UNIs?
>2
2
>2
2
STEP 3
STEP 3
Root UNIs Only?
Root UNIs Only?
YES
EPL
NO
EP-LAN
NO
EP-TREE
YES
EVPL
EVP-LAN
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
NO
EVP-TREE
Slide 56
Ethernet EVC Services Summary
 E-Line (EPL and EVPL)
 Based on Point-to-Point EVC
 EPL provides replacement for legacy T1/E1 leased lines
 EVPL provides replacement for legacy frame relay circuits
 E-LAN (EP-LAN and EVP-LAN)
 Based on Multipoint-to-Multipoint EVC
 E-LAN provides replacement for multi-point IP-VPN and ATM TLS services
 EP-LAN provides transparent extension of the LAN over the WAN
 E-Tree (EP-Tree and EVP-Tree)
 Based on Rooted-Multipoint EVC
 EP-Tree provides transparent hub and spoke topology
 Typical topology for residential broadband providers where UNI to UNI
connectivity is not desired
Module 1-1 – Carrier Ethernet EVC Services Definitions
Copyright 2007 The Carrier Ethernet Academy
Slide 57