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Optimizing Metro Ethernet
Tim Hubbard
Nortel Networks
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RHK Telecom Negotiation Tips
Educating the Enterprise Customer
• “Aggregate spending into one contract to draw
more bids”
– Support for Triple play of Voice, Video, and Data
• “Include renegotiation clause in the event of a
downturn”
– Dynamic bandwidth provisioning
• “Assure latest technology will be used”
– Ethernet-based services in high demand
• “Include termination clauses for poor service”
– Carrier-class availability and verifiable SLAs
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Metro Service Platform
• Advanced Traffic Management
– Bi-directional bandwidth control
– Hierarchical quality of service
– High performance hardware implementation
• Global Scalability
– VPLS
– H-VPLS
• Carrier-class Resiliency
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Traffic Management
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Differentiated Services
Requirements
• Flexible provisioning of Bandwidth:
– Bandwidth control: Rate shaping, policing
• Differentiated service delivery:
– Proven end-to-end Quality of Service
• Wire-speed Implementation of Traffic management
– Low latency
Subscriber Services
Central
Office
Service Provisioning
SLA Monitoring
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Traffic Management Illustration
Incoming Traffic
Measure
by
Classification
(Coloring by
Apps)
Data
Video
Voice
Policing and
Remarking
Discard or re-marked as Best Effort
(Tired ingress
Control)
Best Effort
Priority mapped into .1p tag in vMAN header
Low Priority
Mid Priority
High Priority
To
Switch Fabric
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Traffic Management
Rate Shaping
• Gigabit throughput on any port with over-subscription
– Flexible provisioning of bandwidth per subscriber
• Bi-Directional Rate shaping
– Support for ingress and egress rate shaping
• 3 Color Rate Shaping
• Committed Information Rate (CIR) for guaranteed traffic
• Peak Rate (PR) for Burst Services
• Marking for non-conforming excess traffic
• Granular and Accurate Rate Shaping with 1 and 2 kbps
increments for Ingress and Egress rate limiting;
• Statistics collection: CIR, PR and Dropped Bytes
• Reserve or limit bandwidth per application/per
subscriber
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Traffic Management
Quality of Service
• Quality of Service Implementation:
– Bandwidth allocation per user / per application
– Classification
• “QoS” aware and unaware applications
– Marking
• DiffServ – IP QoS, 802.1p – Ethernet QoS
• Classify, Mark/Re-mark, Schedule
– Scheduling
• 8 hardware-based queues per port to support:
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Traffic Management
1st
level
2nd
1st level
2nd level
3rd level
Per Service
Per Customer Per Physical Port
(VLAN)
(VMAN)
level
Per Service
Per Customer
(VLAN)
(VMAN)
Cust A
Cust A
Cust B
Cust Z
BW Dynamic Allocation = Enables customer to use all bandwidth and fill
it in order of service priority
Each customer has the minimum (=CIR), and maximum (=PR) bandwidth setting
Available resources within the customer’s total bandwidth are allocated to the other service types in
a weighted fashion after priority CIR is met
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High Performance Traffic Management
Supports triple-play: voice, video and data
• Wire-speed implementation
of network processing and
control
• Non-blocking architecture
delivering “zero” latency
• No impact on performance
when features are
activated:
– Rate shaping
– QoS
Maximum Latency
For Voice
• Latency is independent of
network load
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High Performance Traffic Management
Supports triple-play: voice, video and data
• Scalable Multicast Service Delivery
– Wire-Speed forwarding of Unicast and Multicast simultaneously
• Adding multicast will not affect unicast forwarding
– Supports increasing number of user
• Every new receiver will not slow forwarding
• Every port in the network can potentially be a receiver
– Supports increasing number of video streams
• Every new transmitter will not slow forwarding
• Every port in the network can potentially be a transmitter
– No performance drop for video applications
• Video Conferencing
• Video Streaming and distribution
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Global Scalability
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Global Scalability
Layer 2 Multiplexing
• QinQ and MinM
• End-to-end Layer 2 subscriber services
• Provides subscriber scalability and separation of subscriber/provider
Ethernet control traffic
• Traditional Layer 2 VLAN service in access
• Preservation of customer VLAN tags
Subscirber
Layer-2 VLAN
VMANTunnel
or QinQ tunnel
VMAN
Customer
Network
Ethernet VMAN Tunneled Core
Customer
Network
Customer
Network
VMAN to VMAN Switching
Customer
Network
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Global Scalability
Hybrid Ethernet/VPLS Metro
EAPS (RFC 3619)
(Ethernet Automatic
Protection System)
Ethernet (vMAN)
Access Ring
Ethernet (vMAN)
Access Ring
Highly-scalable Metro Core
(VPLS Switched / IP Routed)
MPLS L2VPN Tunnels
(For Differentiated Service Classes
& Fast Path Restoration)
IP Networks
(Internet) &
Content Providers
Either Ring or Mesh
Architecture
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“Carrier-Class” Resiliency
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Availability
Multi-layer Network Resiliency
Layer 1 – Physical
Layer 2 – Ethernet Topologies
Layer 3 – Routing
Software Redundant Port
Chassis
Blade
Port
E- BGP
Internet
48si
Physical Redundancy
• Port, blade, chassis
• Redundant Power
supply
• Redundant
Switching Fabric
• Hot-swappable
• Hitless upgrades,
patching, etc
• Protected memory
VRRP
Link Aggregation
OSPF
Ring
•
•
•
•
STP
RSTP
EAPS
Proprietary
VLAN
Aggregation
• Virtualisation of software
threads and processing
• Software sparing
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Availability
Management / Fabric Resiliency
Hitless Upgrade
Hitless Failover
Switches maintain state
and forwarding capabilities
even in the event of
software or hardware
failures
Existing Core
Software and firmware
can be updated
without taking switch
out of service
Hardware protection
Metro
Ethernet
Network
Protects against cable, port
and I/O module failure
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Availability,
Solutions for Layer-2 Resiliency
• IEEE 802.1w/s  IEEE 802.1D
– Standard - Rapid spanning tree and Multiple instance spanning tree
• IEEE 802.3ad
– Link aggregation often used as 1:1 protection switching
– Provides the benefit of enabling use of “sparing” or standby link when both
interfaces are operating normally
• Dual homed software based redundant ports;
• Virtual Router Redundancy Protocol (VRRP):
– Topology intelligent Ethernet protection;
• Ethernet Automatic Protection System (EAPS) RFC 3619
–
–
–
–
–
Ethernet ring-based protection
Multiple domains on a ring
Multiple domains on a node
VLAN can be member of multiple domains
Co-exists with STP
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Availability – EAPS v2
Ethernet Automatic Protection Switching
•
Layer 2 Fast protection switching for Ethernet
ring topologies
•
EAPS - Informational RFC 3619
•
Fail-over < 50 Milliseconds
– Faster than Fast STP in a ring:
– Fail-over independent of number of nodes in
the ring
•
Traffic flow in both directions paths selectable
per VLAN
– Enables Traffic Engineering
•
Supports simple and complex ring topologies
– Dual attached rings
– Subtended rings
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Metro Service Summary
• Advanced Traffic Management
– Bi-directional bandwidth control
– Hierarchical quality of service
– High performance hardware implementation
• Global Scalability
– QinQ at the Edge
– H-VPLS into the core
• Carrier-class Resiliency
– Ethernet APS
– RPR
– EoSonet/SDH
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End
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