Download Metro Ethernet Services

Metro Ethernet and evolution of
Virtual Private LAN Services (VPLS)
K. A. K. Perera MEng CEng MIET
Deputy General Manager
Data Services & VoIP
Sri Lanka Telecom
Agenda
 Requirements
of Customers
 Metro
Ethernet Models
 Metro
Ethernet Services
 Ethernet
over IP/MPLS
 Discussion
Agenda
 Requirements
of Customers
 Metro
Ethernet Models
 Metro
Ethernet Services
 Ethernet
over IP/MPLS
 Discussion
Requirements of Customers
 High
Speed Connectivity (10,20,50 Mbps….)

Point to Point Data Connectivity

Network Connectivity

Internet Connectivity
 Better
Service Levels

Network availability - 99.999% (Can go out of service
only 5.256 minutes per year)

Ring Access Networks

Highly available Data Nodes

Fast network resiliency
Requirements of Customers
 New
and enhanced Services

LAN interconnections

Virtual Private LAN Services (VPLS)

Enhanced QoS (Quality of Service)
 Cost
Effectiveness

Multiple Services on a single port

Cheap Services – particularly at higher speeds
What is the solution ?

Metro Ethernet

Why Ethernet ?
- Most common Interface today
- Cost effective
- Supports very high Bandwidths (upto 1Gbps)
- Flexible upgrades within a wide range
(1Mbps to 1Gbps)
- Easy and simple to manage and maintain
What is Ethernet ?


Ethernet is a standard communications
protocol embedded in software and hardware
devices, intended for building a Local Area
Network (LAN).
Ethernet transmits data at 10Mbps, Fast
Ethernet supports up to 100Mbps and Gigabit
Ethernet supports up to 1Gbps.
What is Metro Ethernet ?

Metro Ethernet is a
standardized, carrier-class
service defined by five
attributes

Service providers worldwide
are migrating their networks
to deliver Metro Ethernet
services
Agenda
 Requirements
of Customers
 Metro
Ethernet Models
 Metro
Ethernet Services
 Ethernet
over IP/MPLS
 Discussion
Metro Ethernet Models

QinQ (Stacked VLAN)
- IEEE 802.1ad

MinM (Backbone
Provider Bridge)
- IEEE802.1ah

Ethernet over IPMPLS (Pseudowires)
- IETF RFC 4448
DA
SA
802.1q
802.1q
payload
FCS
QinQ Principle
Ethernet Access
Metro Ethernet
a1
Enterprise
CPE
Carrier
Access
Enterprise b1
CPE
Carrier
Access
Customer
a1 b1
Q
a1 b1
Service Provider
a1 b1
Q Q
a1 b1
Q Q
Q
MinM Principle
Ethernet
packet arrives
from enterprise
CPE node at SP
ingress switch
Ethernet packet
switched across
SP Ingress switch the Service
adds SP Ethernet Provider network
using details in SP
header
Src and Dest MAC Ethernet header
addresses are
Ethernet UNI ports
SP Egress switch
removes SP
Ethernet header
And forwards
original Ethernet
packet to end
customer CPE
Ethernet
Switches
Site Y
Ethernet
UNI
(destination)
Site X
Ethernet
UNI
(source)
Service Provider
Metro Ethernet
network
User
data
Enterprise
Ethernet
header
SP Ethernet
header
Agenda
 Requirements
of Customers
 Metro
Ethernet Models
 Metro
Ethernet Services
 Ethernet
over IP/MPLS
 Discussion
Metro Ethernet Services
-
-
High Speed Data Links (VLL)
(LAN interconnections)
Virtual Private LAN Services (VPLS)
High Speed Internet
Access to IP-VPN main links
(VPN backhauling)
High Speed Data Links (VLL)

Typically required to connect;
- Headquaters Building (Main Link)
- Dissaster Recover Centers (DRC)
(LAN interconnections)
LAN interconnection
Metro Ethernet
DRC Site
Head Quarters
Virtual Private LAN Services
(VPLS)
-
Customer feels like remote offices are
connected to the same LAN
Branch A
Metro Ethernet
VPLS
Head Quarters
Branch B
Branch C
High Speed Internet Links

Applications;
- Web browsing
- Hosting applications
- Video Straeming
- Multimedia
- Cyber Cafe
Internet
Metro
Ethernet
VPN back-hauling
-
Metro Ethernet is used as the Access
Network
IP-VPN
Edge Router
Branch A
M-Agg
Existing IP/MPLS Backbone
Si
Metro Ethernet
VPN Back-haul
Branch C
IP-VPN
Branch B
Head Quarters
Multiple Services on single port
-
-
IP-VPN back-hauling
Layer 2 VPN services (VPLS)
High Speed Data Links
(LAN interconnections)
High Speed Internet
Single Port
CPE
IP-VPN
Metro Ethernet
PE
High Speed Data
High Speed Internet
VPLS
Available Speeds



Available Speeds;
- From 1 Mbps to 1000Mbps (1Gbps)
Low Speeds (proposed);
- 1, 2, 3, 4, 5, 6, 8, 10Mbps
High Speeds (proposed);
- 10, 15, 20, 25, 30, 35, 40, 50, 75,
100Mbps,1Gbps
Agenda
 Requirements
of Customers
 Metro
Ethernet Models
 Metro
Ethernet Services
 Ethernet
over IP/MPLS
 Discussion
Why MPLS for Ethernet
Services (EoMPLS)?
More Scalable (Free label Space)
 Sub 50msec resiliency (MPLS Fast
Reroute)
 Traffic Engineering (RSVP-TE)
 Hierarchical QoS (HQoS)
 Easy and simple to operate and
maintenance

Ethernet Services across MPLS

P2P Ethernet Service;
Pseudowire (draft-martini) – VLL




High Speed Data Links – LAN interconnections
High Speed Internet
Access to IP-VPN main links (VPN backhauling)
MP2MP Ethernet Service;
Virtual Private LAN Services – VPLS
Modes of Pseudowires

PW can be configured as;
Mode – Virtual connection (VLL)
between two Ethernet ports
 Raw
DA
SA
payload
FCS
Mode – Virtual connection (VLL)
between two VLAN (802.1Q) ports
 Tagged
DA
SA
802.1q
payload
FCS
Pseudowire – Draft Martini

PWs are constructed by building a pair of
unidirectional MPLS (Label Switch Paths)
LSPs between PEs

LSP labels can be;
Statically assigned or
Assign using LDP or RSVP
LDP with directly connected PEs
DA’
DA
SA
802.1q
SA’
payload
Tunnel
Label
DA
SA
802.1q
FCS
payload
DA
FCS
SA
802.1q
payload
FCS
LDP
Session
CE
PE 1 (LER 1)
(Label 102)
CE
PE 1 (LER 2)
(Label 201)
VC LSPs
PW(VC) Label
102
Ethernet
Packet
PW
102
MPLS Packet
Ethernet
Packet
This type of encapsulation is used to tunnel ATM, FR and other circuit emulation traffic too
VPLS - Introduction

VPLS (L2VPN);

Configure on the MPLS
 Offers MP2MP

VPLS emulates a LAN, which provides;

Full learning capabilities and
 Full switching capabilities

VPLS allows Customers to fully control
their Routing (IP, IPX, IPv6)
VPLS Reference Model
LSP Tunnels
(Pseudowire)
LAN
Services
VPLS
A
CE
CE
PE 1
PE 2
SLT Metro Ethernet
(MPLS)
VPLS
B
VPLS
A
CE
CE
VPLS
B
PE 3
VC LSPs
VPLS
A
• PEs can participate in one or many VPLS domains
• CEs visualize VPLS like an Ethernet Switch
• Broadcast domains are maintained per VPLS basis by PEs
VPLS requirements

Separation between VPLS domains;
 Each
customer domain emulates its own
LAN
 VPLS PEs must maintain separate Virtual
Switching Instance (VSI) per VPLS

MAC learning;
 Capable
of learning and forwarding based on
MAC addresses
VPLS requirements (Cont.)

Switching;
 VPLS
should be capable of switching
packets between different tunnels based on
MAC addresses

Flooding;
 VPLS
should be able to support the flooding
packets with unknown MAC addresses
Hierarchical VPLS (HVPLS)
CE Routers
VLANs, Stacked
VLANs or VC
Labels
MTU
MTU
PE
MTU
PE
Spoke VCs
MTU
PE
PE
MTU
MTU
PE
MTU
PE
MTU
MTU
MTU
PE
PE
Hub VCs
MTU

Not scalable
MTU
MTU
MTU

Hierarchy reduces
full mesh network - scalable
Configurations of VPLS
1) Bridged VPLS – VPLS and Customer LANs are in the
same broadcast domain (Routers not required)
CE
PE 1
VPLS A
Metro Ethernet (MPLS)
PE 3
CE
PE 2
CE
Configurations of VPLS
2) Routed VPLS – VPLS and Customer LANs are in
different broadcast domains
(Routers/L3 Switches are required)
CE
PE 1
VPLS B
Metro Ethernet (MPLS)
PE 3
CE
PE 2
CE
Quality of Service (QoS)
DSCP=5=voice
DSCP=4=video
Reserve 2 Mb/s
Reserve 2 Mb/s
16 Mb/s
DSCP=1=Data
DSCP=0=Internet


Reserve 4 Mb/s
Reserve 8 Mb/s
Installed SLA
 Voice 2 Mb/s
 Video 2 Mb/s
 Data 4 Mb/s
 Internet 8 Mb/s
 TOTAL=16 Mb/s required
Actual usage
 Voice 1 Mb/s
 Video 1 Mb/s
 Data 4 Mb/s
 Internet 8 Mb/s
 TOTAL = only 14 Mb/s
used
If higher priority traffic is not consuming all the reserved
bandwidth, the lower priority forwarding classes cannot use the
remaining bandwidth – Solution HQoS

Normal QoS Vs HQoS
Normal QoS
Hierarchical QoS
Queue
Queue
DSCP=5=voice
Strict / Weighted
Rate Limiting
Schedule
Queue
Queue
DSCP=4=video
Queue
Strict / Weighted
Rate Limiting
Schedule
Strict / Weighted
Rate Limiting
Schedule
DSCP=1=Data
Queue
Strict / Weighted
Rate Limiting
Schedule
Queue
Strict / Weighted
Rate Limiting
Schedule
Queue
DSCP=0=Internet

Queue
Queue
Queue
Queue
Strict / Weighted
Rate Limiting
Schedule
Unique 3-level parent/child scheduling
 Maintains relative priorities
 Enables lower priority bursting when higher priority is below
CIR
High Speed Resiliency
- The switchover from the working link to the protection link
will happen within sub 50ms to ensure that no impact on
real time applications
- MPLS (Multi Protocol Label Switching) with MPLS Fast
Reroute enables this feature
Point of Local
Repair
Primary Path
(PLR)
R2
R3
R4
R5
R1
End-toEnd
Repair
R9
R6
R7
R8
Detour LSP
Secondary Path
Reference Network – SLT
5 Rings
3 Rings
Slave
Island
Si
Colombo
Si
Maradana
Si
1 Ring
Existing IP/MPLS
Backbone
Liberty plaza
Si
3 Rings
10GE
GE
N-PE
M-Agg
Si
Si
Si
Si
Si
Si
L2 MPLS
Aggregation
Ring
Havelock
town
Si
1 Ring
Ethernet service revenues
$20,000
$18,000
$16,000
$14,000
$12,000
$10,000
$8,000
$6,000
$4,000
$2,000
$0
Ethernet
Services
2003 2004 2005 2006 2007
Concluding Remarks
“Metro Ethernet” delivers cost effective, high
speed, scalable, reliable and multi-service
Ethernet services to the customers through
the sate-of-the-art MPLS technology
Agenda
 Requirements
of Customers
 Metro
Ethernet Models
 Metro
Ethernet Services
 Ethernet
over IP/MPLS
 Discussion
Thank you