Title: Connectionoriented Ethernet Attributes and Applications
1Connection-oriented Ethernet Attributes and
Applications
Ralph Santitoro Ralph.Santitoro_at_us.fujitsu.com
3Q09 Toronto Meeting July 22, 2009
2Contents
- CLE and COE 2 implementations of Ethernet
- COE Attributes
- COE Applications
3Connectionless Ethernet (CLE)
4Connectionless Ethernet (CLE) Challenges
- Ethernet switches forward frames to correct port
based on destination MAC address (DA) - If destination MAC address unknown, switches
broadcast frames to all ports (called flooding) - Flooding creates additional BW requirements on
all links - Amount of flooding is not predictable
- DA becomes known by learning
- DA becomes unknown when the bridges age out MAC
table entries in their memory 5 minutes - Table entry will not age out if frames keep
comingbut no one can control this
Flooding plays havoc with QoS and resource
reservation
5Flooding Simplified
I know where C is (for now)
Where is C again?
DA Destination Address
6CLE Challenges Spanning Tree Protocol
A
B
STP Blocked Link
D
C
STP up to 2s protection switching speeds.
Difficult provisioning
7Connection-oriented Ethernet (COE)
- Provides explicit definition of Ethernet paths
- Disables Ethernet MAC address learning flooding
- Ethernet paths could be
- End to end (EVC)
- Individual network segments
- Resource reservation and admission control per
EVC per CoS - Per-connection (EVC/Path) traffic management and
traffic engineering
COE addresses the CLE challenges
8COE Supported Network Topologies / MEF Service
Types
Linear
Mesh (E-Line or E-Tree)
Ring (E-Line or E-Tree)
Hub Spoke (E-Tree or Service Multiplexed EVPL)
E-Line
COE supports many topologies to support popular
Ethernet services
9EMS/NMS Plays Critical Role for COE
- COE does not use bridging control protocols
- NMS used to provision VLAN cross connects and
tunnels - COE relies on EMS/NMS for
- Setup working/protect traffic engineered EVCs or
network segments - Setup bandwidth profiles (CIR/EIR) with BW
reservation - CIR is really guaranteed like with SONET/SDH
- Other OAM function such as Fault Management
COE places more emphasis on the importance of the
NMS
10COE The best of both worlds
- SONET / SDH
- Deterministic and precision QoS
- Bandwidth reserved per STS / STM
- 99.999 Availability
- Highest Security (L1 service)
- Connectionless Ethernet
- Layer 2 Aggregation
- Statistical Multiplexing
- Flexible Bandwidth Granularity
- Cost Effectiveness
- Connection-Oriented Ethernet
- Layer 2 Aggregation and Statistical Multiplexing
- Deterministic and precision QoS
- Bandwidth reserved per connection
- Flexible Bandwidth Granularity
- 99.999 Availability
- Cost effectiveness
- Highest Security
COE makes Carrier Ethernet more like a Layer 1
service but with all the benefits of Layer 2
Ethernet
11COE Key Benefits
Attributes
Benefits
Explicit Definition of Ethernet Path
Deterministic, Predictable, Scalable, Secure
Resource Reservation and Connection Admission
Control
Guaranteed SLAs
Per Connection QoS and Traffic Engineering
Bandwidth Profiles Tiered Services
Robust Ethernet OAM
Comprehensive Monitoring and Troubleshooting
Carrier Class Service Protection
lt 50ms Protection / Restoration
12Why COE ?
- Makes Ethernet more like SONET which has
dominated the metro network - Network operations procedures similar to SONET
- Smooth transition for SONET-trained operations
personnel - Easily scales to meet large scale metro
connectivity and aggregation requirements - Ideally suited for
- EoX Aggregation for handoff to service edge
networks - Mobile Backhaul Networks
- High Performance EVPL and EPL services
COE focus today Service Delivery and
Infrastructure in the Metro
13Different approaches to COE
MPLS-centric COE
Ethernet-centric COE
PBB-TE
VLAN Tag Switching
Static PW
T-MPLS
MPLS-TP
PW
PW
Eth
Eth
MPLS LSP
Eth
Eth
S-VLAN or PBB-TE
- Ethernet
- MPLS Pseudowire (PW)
- MPLS Label Switched Path (LSP)
- Ethernet-centric COE now being used in metro
networks - MPLS-centric COE
- Standards being developed.
- Proposed usage for interconnection of MPLS core
routers
Ethernet-centric COE being deployed today
14COE Attributes
15Attributes of Connection-oriented Ethernet
- Standardized Services
- EPL, EVPL, EP-Tree, EVP-Tree
- MEF 6, MEF 10.2
COE Attributes
- Deterministic QoS
- Low Delay, Delay Variation, Loss
- Y.1731, 802.1ag, MEF 10.2
- Bandwidth Resource Reservation
- High Scalability
- Millions of EVCs
- Layer 2 Aggregation
- Statistical Multiplexing
- Full Service Management
- Link Fault Management
- 802.3ah
- Service (EVC) Fault Management
- Y.1731, 802.1ag,
- High Reliability
- 50ms Protection / Restoration
- G.8031
- 802.3ad Link Aggregation
- Security
- Bridging disabled - no vulnerabilities
- L2 DOS attacks mitigated
- MAC DOS attacks mitigated
COE is a high performance implementation of
Carrier Ethernet
16COE Security Comparable to SONET
- Management VLANs isolated from Subscriber traffic
- similar to DCN isolation from subscriber traffic
in SONET networks - With COE, MAC Address Learning / Flooding is
disabled - MAC Address spoofing cannot occur
- MAC table overflow DOS attacks cannot occur
- With COE, vulnerable Layer 2 Control Protocols
(L2CPs) like STP are disabled - Protocol-based vulnerabilities (DOS attacks) are
mitigated - With COE, bridging is disabled so additional
ports cannot be bridged to the point-to-point
service - Traffic snooping cannot occur
COE provides security comparable Layer 1
(EoSONET) but without any of SONET bandwidth
utilization issues
17Ethernet OAM for COE
Service OAM
Tunnel OAM
EVC1
EVC1, 2 and 3
EVC2
MSC
EVC3
Link
Link OAM
COE leverages the complete set of Ethernet OAM
standards
18COE Attributes for Network Survivability
- IEEE 802.3ad Link Aggregation Groups (LAG)
- For local (link level) diversity and protection
- If any fiber or port in LAG fails, other LAG
members share the load - Can implement 11 protection with working/protect
LAG members - ITU-T G.8031 Linear Path Protection
- for EVC path diversity and sub-50ms path
protection - Similar to SONET 11 UPSR path protection
- Simple Provisioning Setup Working path and
Protect path - Independent of Network Topology
- Rings, Meshes, Multiple Rings and Linear
Topologies
COE achieves high availability via multiple
levels of protection
19COE Provides Dedicated Protection Switching
- Ethernet Linear Protection (ITU-T G.8031)
- Dedicated protection resources
- lt 50ms protection switching time
- Simple provisioning
20Link and Path Protection Equivalency
SONET
11 OC-192
11 OC-N
11 OC-N
UPSR
11 OC-N
11 OC-N
Ethernet
11 LAG
11 LAG
11 LAG
G.8031
GE
GE
10GE
10GE
10GE
11 LAG
COE protection similar to SONET
21COE Applications
22COE Application Categories
- Transport and Infrastructure
- Layer 2 Aggregation to Service Edge Networks
- Mobile Backhaul
- Triple Play Residential Broadband Backhaul
- IPTV, Video on Demand, Internet Access, Voice
- Access to Network-based IP/MPLS VPNs
- Access to MPLS Inter-Metro Core Network
- Service Delivery
- Layer 2 connectivity services
- EPL and EVPL
- EP-Tree and EVP-Tree
- Ethernet Internet Access (EIA)
23COE for Layer 2 EoX Aggregation Infrastructure
EoF
Internet Access
GbE/10GbE
VoIP/ IMS
GbE/10GbE
COE EoX Aggregation Network
Eo?
IP VPN
EoPDH
MPLS Inter-Metro LD Core
NxDS-1
PDH Access Network
OC-n
NxDS-3
MTSO
EoCu
Copper Access Network
Video Serving Office
GbE
EoS
Switched Ethernet Services
SONET
CPE
Aggregation
EoX Access
Service Edges
COE for Ethernet Aggregation for all Service Edge
Networks
24COE for Business Ethernet Services
EVPL
EPL
EVC
EVC
UNI
Service Multiplexed UNI
UNI
UNI
COE Network
COE Network
UNI
UNI
EVC
EVC
UNI
UNI
Retail Ethernet Services
Wholesale Access Provider Network
Service Provider Network
E-NNI
UNI
UNI
EVC
OVC
COE
COE
Wholesale Ethernet Services
25COE for Mobile Backhaul
COE Backhaul Transport Network
UNI
Cell Sites
MTSO
UNI
UNI
UNI
UNI
- E-Line and E-Tree Service Types highly suitable
for Mobile Backhaul Networks
COE meets the stringent requirements of Mobile
Backhaul
26Summary
- COE is a high performance implementation of
Carrier Ethernet - With added Security benefits
- COE provides a common metro EoX aggregation
solution - for Ethernet access to all service edge networks
- COE facilitates the evolution of SONET metro
transport networks to Carrier Ethernet - COE is operationally similar to SONET
27COE Discussion