Transcript Connection-oriented Ethernet Attributes and Applications

Connection-oriented Ethernet
Attributes and Applications
Ralph Santitoro
[email protected]
3Q09 Toronto Meeting
July 22, 2009
Contents
• CLE and COE: 2 implementations of Ethernet
• COE Attributes
• COE Applications
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Connectionless Ethernet (CLE)
Connectionless 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 coming—but no one can
control this
Flooding plays havoc with QoS and resource reservation
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Flooding Simplified
I know where C is (for now)
CE
A
B
Where is C again?
CE
A
DA=C
CE
CE
B
DA=C
DA=C
Multipoint
EVC
Multipoint
EVC
DA=C
DA=C
C
C
CE
CE
Destination MAC address
has a known destination port
Flooding: Destination MAC address
has unknown destination port
DA = Destination Address
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CLE Challenges: Spanning Tree Protocol
A
CE
CE
B
A
CE
STP
Blocked
Link
D
CE
Link
Failure
CE
C
CE
B
Failover
D
CE
New STP
Blocked Link
CE
C
STP: up to 2s protection switching speeds. Difficult provisioning
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Connection-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
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COE Supported Network Topologies / MEF Service Types
Linear
Mesh
(E-Line or E-Tree)
E-Line
Hub & Spoke
(E-Tree or Service
Multiplexed EVPL)
Ring
(E-Line or E-Tree)
COE supports many topologies to support popular Ethernet services
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EMS/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
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COE: The best of both worlds
Connectionless Ethernet
SONET / SDH
• Layer 2 Aggregation
• Statistical Multiplexing
• Flexible Bandwidth Granularity
• Cost Effectiveness
• Deterministic and precision QoS
• Bandwidth reserved per STS / STM
• 99.999% Availability
• Highest Security (L1 service)
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
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COE Key Benefits
Attributes
Benefits
Explicit Definition of Ethernet Path
Deterministic, Predictable,
Scalable, Secure
Resource Reservation and
Connection Admission Control
Guaranteed SLA’s
Per Connection QoS
and Traffic Engineering
Bandwidth Profiles
Tiered Services
Robust Ethernet OAM
Comprehensive Monitoring and
Troubleshooting
Carrier Class Service Protection
< 50ms Protection / Restoration
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Why 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
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Different approaches to COE
MPLS-centric COE
Static PW
Eth PW
T-MPLS MPLS-TP
MPLS LSP
PW Eth
• Ethernet
• MPLS Pseudowire (PW)
• MPLS Label Switched Path (LSP)
Ethernet-centric COE
PBB-TE
Eth
VLAN Tag
Switching
S-VLAN or PBB-TE Eth
• Ethernet
• 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
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COE Attributes
Attributes of Connection-oriented Ethernet
Standardized Services
• EPL, EVPL, EP-Tree, EVP-Tree
• MEF 6, MEF 10.2
Deterministic QoS
High Scalability
• Low Delay, Delay Variation, Loss
• Y.1731, 802.1ag, MEF 10.2
• Bandwidth Resource Reservation
• Millions of EVCs
• Layer 2 Aggregation
• Statistical Multiplexing
COE
Attributes
Full Service Management
High Reliability
• Link Fault Management
• 802.3ah
• Service (EVC) Fault Management
• Y.1731, 802.1ag,
• 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
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COE 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
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Ethernet OAM for COE
Standard
Fault
Management
Comparable to
SONET
ITU-T Y.1731 / IEEE 802.1ag
Tunnel Layer
STS Path / VCG
ITU-T Y.1731 / IEEE 802.1ag
Service (EVC) Layer
VT1.5 or STS Path
IEEE 802.3ah
Link (physical) Layer
SONET Line
FLASHWAVE
CDS
FLASHWAVE
Tunnel OAM
EVC1
EVC2
Service OAM
EVC1, 2 and 3
FLASHWAVE
CDS
MSC
CDS
EVC3
FLASHWAVE
CDS
Link
Link OAM
COE leverages the complete set of Ethernet OAM standards
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COE 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 1:1 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 1+1 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
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COE Provides Dedicated Protection Switching
• Ethernet Linear Protection (ITU-T G.8031)
– Dedicated protection resources
– < 50ms protection switching time
– Simple provisioning
Link
Failure Failover
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Link and Path Protection Equivalency
SONET
1+1
OC-N
1+1
OC-192
1+1
OC-N
UPSR
CE
1+1 OC-N
PE
1+1 OC-N
Ethernet
1:1
LAG
CE
GE
1:1
LAG
1:1
LAG
G.8031
GE
10GE
10GE
PE
10GE
1:1
LAG
COE protection similar to SONET
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COE Applications
COE 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)
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COE for Layer 2 EoX Aggregation Infrastructure
EoF
Internet Access
GbE/10GbE
Eoλ
EoPDH
NxDS-1
NxDS-3
PDH Access
Network
EoCu
Copper Access
Network
EoS
GbE
COE EoX
Aggregation Network
GbE/10GbE
SONET
CPE
EoX Access
Aggregation
VoIP/ IMS
IP VPN
MPLS Inter-Metro
LD Core
MTSO
Video Serving Office
Switched Ethernet
Services
Service Edges
COE for Ethernet Aggregation for all Service Edge Networks
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COE for Business Ethernet Services
EVPL
EPL
EVC
UNI
Service
Multiplexed
UNI
UNI
COE
Network
UNI
EVC
EVC UNI
UNI
COE
Network
EVC
UNI
UNI
Retail Ethernet Services
Service
Provider
Network
UNI
EVC
Wholesale
Access Provider
Network
E-NNI
UNI
OVC
COE
COE
Wholesale Ethernet Services
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COE for Mobile Backhaul
UNI
Cell Sites
COE Backhaul
Transport Network
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
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Summary
• 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
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COE Discussion