Customer premises

 

 

 

Access and aggregation

 

 

Metro Core

 

 

WAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Voice Gateway Call Server

 

 

 

Remote

 

 

 

 

 

 

 

 

 

 

Office

 

 

 

 

 

 

 

 

 

 

WLAN

 

 

 

 

 

 

Voice

 

 

 

Metro ESU

 

 

 

network

 

 

 

 

 

 

 

 

 

 

 

 

 

18xx

 

 

 

 

 

 

 

Residential

 

 

 

MERS

 

 

 

 

 

 

building

 

 

 

8600

 

 

 

IP/MPLS

 

 

 

 

 

 

 

 

House

 

 

 

 

Optical

 

 

Wide Area

 

 

 

 

 

transport

 

 

Network

 

 

 

 

 

 

 

MERS

SONET/SDH

 

OM 1000,

 

 

 

 

 

 

 

OME 1000

 

8600

 

 

 

Corporate headquarters

LH WDM

Existing

Data center L2/L3 CLE

 

 

OLT,

 

Access

Fiber, Coax,

CMTS,

Other PBB

networks

 

networks

or Copper

 

 

DSLAM

 

 

 

 

Video

Headend

MPEG

VOD Encoders

Servers

Figure 1. A converged network showing simultaneous delivery of multiple services to varied end users

Reliability

The Metro Ethernet Routing Switch 8600 architecture is designed to provide protection strategies at multiple levels to deliver “five nines” availability.

At the device level, the Metro Ethernet Routing Switch 8600 is equipped with redundant, hot-swappable, components

—switch fabrics, control processors, power supplies and fan trays. Temperature sensors constantly monitor the compo- nents and cooling systems to maintain acceptable system conditions.

At the trunk level, Distributed Multi- Link Trunking (DMLT) provides redundancy by enabling trunk groups to be configured across different slots in the same chassis. In the event of a failure, links would remain active, because other modules in the trunk group could take over.

Network and link redundancy is provided by several key features:

•50ms failover when using ring-based access with Metro Ethernet Services Units

•50ms failover based on LACP MLT between Metro Ethernet Routing Switch 8600s

•50ms failover based on 802.1ag signaling across PBT tunnels

•Multi-Link Trunking

•Sub-second failover based on RSTP/MSTP protocols (IEEE 802.1w and 802.1s respectively) on NNI trunk ports

Nortel’s innovative Split Multi-Link Trunking (SMLT) and PBT capabilities improve the scalability and reliability of Layer 2 networks by removing spanning tree convergence issues and providing faster recovery in the event of link failures

Service management

Service providers require mature network and service management systems that allow quick configuration of the network to support new services as well as quality control of ongoing operations. Since it is important to get the customer’s service up and running quickly, and then keep the service running as measured against

a service level agreement (SLA), the service provider must have the performance measurements to back up any service-level claims. Additionally, if a fault does occur, the service provider needs the troubleshooting functionality to locate the fault, identify which services have been impacted and react to these appropriately.

Nortel’s Metro Ethernet Manager (MEM) is a complete, robust network and service management solution that extends Nortel’s key Metro Ethernet innovations such as PBB/PBT technologies while addressing these top-of-mind operational challenges for service providers. Purpose-built to simplify Ethernet operations and facilitate service turn-up, Metro Ethernet Manager employs a consistent work-flow approach to planning and deploying services reliably while minimizing opportunities for configuration mistakes, and allowing quick root cause analysis and recovery when they do occur.

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