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Optimizing Metro Ethernet

Tim Hubbard

Nortel Networks

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RHK Telecom Negotiation TipsEducating 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

Subscriber Services

Service Provisioning

SLA Monitoring

Central

Office

• 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

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Traffic Management Illustration

Incoming Traffic

Measure by Classification

(Coloring by Apps)

Voice

Video

Data

Policing and Remarking

(Tired ingress Control)

Discard or re-marked as Best Effort

Best Effort

To Switch Fabric

High Priority

Mid Priority

Low Priority

Priority mapped into .1p tag in vMAN header

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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

Cust A

Cust B

Cust Z

1st level

Per Service

(VLAN)

2nd level

Per Customer

(VMAN)

3rd level

Per Physical Port

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

Cust A

1st level

Per Service

(VLAN)

2nd level

Per Customer

(VMAN)

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• 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

• Latency is independent of network load

Maximum LatencyFor Voice

High Performance Traffic ManagementSupports triple-play: voice, video and data

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• 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

High Performance Traffic ManagementSupports triple-play: voice, video and data

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Global Scalability

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Global ScalabilityLayer 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

Ethernet VMAN Tunneled CoreCustomerNetwork

CustomerNetwork

CustomerNetwork

CustomerNetwork

SubscirberLayer-2 VLAN

VMAN Tunnel

VMAN to VMAN Switching

VMAN or QinQ tunnel

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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

Global ScalabilityHybrid Ethernet/VPLS Metro

EAPS (RFC 3619)

(Ethernet Automatic Protection System)

Either Ring or Mesh Architecture

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“Carrier-Class” Resiliency

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AvailabilityMulti-layer Network Resiliency

Physical Redundancy• Port, blade, chassis• Redundant Power

supply • Redundant

Switching Fabric • Hot-swappable• Hitless upgrades,

patching, etc• Protected memory

Chassis Blade Port

Layer 1 – Physical

OSPF

Layer 3 – Routing

VRRP

InternetE- BGP

VLAN Aggregation

• Virtualisation of software threads and processing

• Software sparing

Layer 2 – Ethernet Topologies

48si

Software Redundant Port

Link Aggregation

Ring

• STP• RSTP• EAPS• Proprietary

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AvailabilityManagement / Fabric Resiliency

Hitless Upgrade

Software and firmware can be updated

without taking switch out of service

Hitless FailoverSwitches maintain state

and forwarding capabilities even in the event of

software or hardware failures

Hardware protectionProtects against cable, port

and I/O module failure

Existing Core

Metro Ethernet Network

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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 v2Ethernet 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