1. Optimizing Metro Ethernet
Tim Hubbard
Nortel Networks

2. 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

3. 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

4. Traffic Management

5. 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
Service Provisioning
SLA Monitoring
Central
Office

6. 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

7. 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

8. 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:

9. Traffic Management
1st level
Per Service
(VLAN)
2nd level
Per Customer
(VMAN)
3rd level
Per Physical Port
1st level
Per Service
(VLAN)
2nd level
Per Customer
(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

10. 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
Latency is independent of network load
[Jodi] Can we get better product shots? These aren’t very clear.
Maximum Latency
For Voice

11. 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

12. Global Scalability

13. 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
VMAN or QinQ tunnel

14. Global Scalability Hybrid Ethernet/VPLS Metro
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
EAPS (RFC 3619)
(Ethernet Automatic Protection System)
Either Ring or Mesh Architecture

15. “Carrier-Class” Resiliency

16. Availability Multi-layer Network Resiliency
Layer 1 – Physical
Layer 2 – Ethernet Topologies
48si
Software Redundant Port
Link Aggregation
Ring
STP
RSTP
EAPS
Proprietary
OSPF
Layer 3 – Routing
VRRP
Internet
E- BGP
VLAN Aggregation
Virtualisation of software threads and processing
Software sparing
Chassis
Blade
Port
Physical Redundancy
Port, blade, chassis
Redundant Power supply
Redundant Switching Fabric
Hot-swappable
Hitless upgrades, patching, etc
Protected memory

17. Availability Management / Fabric Resiliency
Hitless Upgrade Software and firmware can be updated without taking switch out of service
Hitless Failover Switches maintain state and forwarding capabilities even in the event of software or hardware failures
Existing Core
Hardware protection Protects against cable, port and I/O module failure
Metro
Ethernet
Network

18. 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

19. 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

20. Metro Service Summary Advanced Traffic Management Global Scalability
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

21. End