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MetroCONNECT: Ethernet Access Networking
 

MetroCONNECT: Ethernet Access Networking

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The importance of Ethernet, as the all-pervasive fixed infrastructure data transport vehicle of the Corporate 'Local-Area Network' (LAN), is such that it can be regarded as nothing less than a ...

The importance of Ethernet, as the all-pervasive fixed infrastructure data transport vehicle of the Corporate 'Local-Area Network' (LAN), is such that it can be regarded as nothing less than a fundamental utility for IT connectivity. Increasingly, Ethernet is also the network media of choice for Corporate Telephony deployments, via the growth of Voice over IP (VoIP). Not surprisingly, Ethernet is now starting to be adopted as a transport for Wide-Area Network (WAN) connectivity. In fact, Telecoms Service Providers have offered physical Ethernet access for many years, but most almost exclusively such connections have been delivered via Edge Routers, supplied as the 'Customer Premise Equipment' (CPE) element of a 'Managed IP' network service. Only relatively recently though has Ethernet been offered as a native transport solution, offering the Corporate user a highly flexible, scalable bandwidth solution, unfettered by the complexity of IP addressing schema and the potential performance and limited 'Quality of Service' characteristics of Routed infrastructures.The MetroCONNECT family of Ethernet Service Delivery products enables the Telecoms Service Provider to offer Ethernet services delivered over a range of Access Network Transport architectures.

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    MetroCONNECT: Ethernet Access Networking MetroCONNECT: Ethernet Access Networking Document Transcript

    • Carrier Ethernet Services Delivery Solution Brief MetroCONNECT Ethernet Access Networking Feb, 2011 Metrodata Ltd Fortune House, TW20 8RY U.K.Tel: +44 (0)1784 744700 www.metrodata.co.uk E-mail: sales@metrodata.co.uk
    • Carrier Ethernet Services DeliveryIntroductionThe importance of Ethernet, as the all-pervasive fixed infrastructure data transport vehicle of theCorporate Local-Area Network (LAN), is such that it can be regarded as nothing less than a fundamentalutility for IT connectivity. Increasingly, Ethernet is also the network media of choice for CorporateTelephony deployments, via the growth of Voice over IP (VoIP).Not surprisingly, Ethernet is now starting to be adopted as a transport for Wide-Area Network (WAN)connectivity. In fact, Telecoms Service Providers have offered physical Ethernet access for many years,but most almost exclusively such connections have been delivered via Edge Routers, supplied as theCustomer Premise Equipment (CPE) element of a Managed IP network service. Only relatively recentlythough has Ethernet been offered as a native transport solution, offering the Corporate user a highlyflexible, scalable bandwidth solution, unfettered by the complexity of IP addressing schema and thepotential performance and limited Quality of Service characteristics of Routed infrastructures.The increasing demand by customers for direct end-to-end Ethernet WAN connectivity presents aninvestment challenge to the Service Provider. Whilst in Metropolitan centres, the deployment of high-speed, fibre based network, over which Ethernet services at up to 1Gbps or beyond might readily besupported, this is certainly not the case, even in more economically and technologically advancedcountries, for rural locations. Whilst Telecoms Infrastructure Carriers the world over are investing inupgrading their legacy SDH/PDH infrastructures to so-called Next Generation packet-based networks,Service Providers can potentially offer Ethernet Access solutions which make use of existing legacyinfrastructures. Service Provider Core Network Customer Customer Ethernet Edge Ethernet Edge Site A Site B Access via Access via Fibre Legacy SDH/PDH Ethernet over Fibre Ethernet over E1 Demarcation Device Demarcation Device (as an example) Fig. 1: Ethernet Access Delivery may be via a variety of Next-Gen and/or Legacy infrastructure, such as PDH (E1) shown hereEthernet Extension & Access DemarcationThe MetroCONNECT family of Ethernet Service Delivery products enables the Telecoms ServiceProvider to offer Ethernet services delivered over a range of Access Network Transport architectures.MetroCONNECT solutions feature two essential technologies, (i) Switched LAN Extension and (ii)Managed Ethernet Service Demarcation. Ethernet Service Delivery Access over SDH/PDH & Serial Infrastructure Page 1 of 6
    • Carrier Ethernet Services DeliverySwitched Ethernet ExtensionIn its most simplistic form, LAN Extension simply offers a transparent Layer-2 Extension of an Ethernetnetwork across another transport technology. The MetroCONNECT family offers extension solutions forFibre, SDH/PDH and Serial network infrastructures. A simple example, featuring point-to-point Ethernetextension over a single E1 or T1 service via stand-alone WCM1100 products, is shown in Fig. 2 below: SDH/PDH Core / Edge Network Single E1/T1 (Terrestrial/Wireless) Single E1/T1 Clear-channel or Clear-channel or Fractional Fractional Ethernet Ethernet Metrodata WCM1100 Ethernet over E1/T1 Demarcation Devices Customer Customer Site A Site B Fig. 2: Point-to-Point Ethernet Extension over Clear Channel or Fractional (Nx 64Kbps) E1 or T1 serviceIn line with other family members of the MetroCONNECT range, the WCM1100 product supports thefollowing core features:  Copper and Fibre (SFP) switch ports for 10/100/1000 Ethernet (with Jumbo Frame support)  Clear-channel and Framed / Fractional services  VLAN tag-switching (802.1q) & traffic prioritisation (802.1p / IP DSCP)  Comprehensive SNMP/Telnet Management  Carrier-Ethernet OAM support (EFM or Link OAM IEEE 802.3ah and CFM IEEE 802.1ag)  Metrodata Zero touch deployment with IP over OAM proxy (or far-end device management with no remote IP address setting required)  GFP/VCAT/LCAS support for interoperability with 3rd party central site aggregation / MSP platform  TACACS+ for secure authenticationIn general, the stand-alone devices within the MetroCONNECT family are used either by Corporatecustomers for ad-hoc point-to-point Ethernet extension applications, or as CPE devices by EthernetService Providers, for whom more application detail will be discussed in a later section.MetroCONNECT solutions offer more deployment flexibility than for just simple Point-to-Point networks.As shown in Fig. 3 below, Point-to-Multipoint deployments are also possible. In this example scenario,WCM1100 and WCM1400 units are shown in combination to provide Ethernet extension from a Centrallocation to three others. In this example, two further aspects of the MetroCONNECT family are Ethernet Service Delivery Access over SDH/PDH & Serial Infrastructure Page 2 of 6
    • Carrier Ethernet Services Deliveryhighlighted, namely (i) the use of VLAN tag switching to define multiple traffic destinations, and (ii) the useof Virtual Concatenation (VCAT) and Link Capacity Adjustment Scheme (LCAS) to facilitate the bondingof two or more SDH/PDH circuits to provide greater Ethernet bandwidth in the connection between anytwo sites. As a point of further note, the MetroCONNECT SDH/PDH extension products use the well-defined standard Generic Framing Protocol (GFP) for Ethernet encapsulation over SDH/PDH circuits,which facilitates potential inter-operability with other network Aggregation platforms. Single or Multiple Ethernet Networks Metrodata WCM1400 Up to 4x E1/T1 Customer Site A SDH/PDH Core / Edge Network (Terrestrial/Wireless) Dual bonded Single E1/T1 E1/T1 Single E1/T1 Metrodata WCM1400 Metrodata WCM1100 Customer Customer Site D Site B Customer Site C Fig. 3: Point-to-Multipoint Ethernet Extension over E1 or T1, also illustrating the use of PDH circuit bonding for increased Ethernet bandwidth connectionsFig. 3 illustrates Ethernet extension between Site A and three further sites, B through D. Using VLAN Tagswitching, the following Ethernet connectivity scenarios can be supported within the context of the basicconnectivity illustrated; 1. The Ethernet network A, B, C, D may be a single flat network domain, within which all broadcast traffic will propagate to each of the locations. 2. The single network at A may contain multiple pre-defined customer VLANs, which may be used by the WCM1400 to determine the appropriate destinations for appropriate traffic to be switched to B, C or D accordingly 3. Multiple separate Ethernet networks may be present at A (the WCM1400 can support up to three separate local Ethernet connections), for which it may be appropriate that traffic is switched to locations B, C and D accordingly. The WCM1400 may be set to do this, the Ethernet ingress- ports being used to define different VLAN groupings with may comprise either a single physical link, e.g. to Sites B and C above, or a multiple bonded link as for site D above.A wide range of stand-alone MetroCONNECT family devices are available, each with common OperatingSystem and feature-set. Full details are available via the Metrodata Ltd. Web Site; www.metrodata.co.uk. Ethernet Service Delivery Access over SDH/PDH & Serial Infrastructure Page 3 of 6
    • Carrier Ethernet Services DeliveryManaged Ethernet Service DemarcationIn addition to their role as Ethernet Extenders, the MetroCONNECT family products are also manageableEthernet Demarcation Devices. The Corporate customer or Service Provider has management visibilityboth towards the WAN service and LAN connection on either side of the MetroCONNECT device. Inaddition to SNMP and Command-Line (Via Telnet) management, all devices in the range supportelements of the Carrier Ethernet Operations and Management (OAM) protocol suite, specifically both theEthernet First Mile (EFM) or Link OAM protocol defined under IEEE 802.3ah and the Connectivity FaultManagement (CFM) protocol defined under IEEE 802.1ag. In the case of the Service Provider, suchprotocols enable the MetroCONNECT products to interoperate with a wider Carrier Ethernet environmentand to enable a degree of pro-activity in fault management.MC12000 Ethernet Service Delivery PlatformFor the Service Provider, wishing to connect a number of remote customer clients across a variety oftechnologies from the CO or exchange environment, Metrodata offers the MC12000 chassis solution as aconcentration point for Ethernet Extension / Service Delivery applications.The MC12000 is a resilient chassis solution offering dual-redundant AC or -48V DC PSU options andmanaged connectivity for up to 12 modules for Ethernet connection over a variety of media. Specifically,the following modules are supported:  Ethernet over single E1/T1  Ethernet over up to 4x bonded E1/T1 (or aggregation up to 4x single or bonded E1/T1 groups)  Ethernet over 8x bonded E1/T1 (or aggregation up to 4x single or bonded E1/T1 groups)  Ethernet over single E3/DS3  Ethernet over 2x bonded E3/DS3  Ethernet over single STM1/OC3 (VC4 or nxVC3)  Ethernet over Serial, (X.21, V.35, EIA.530, HSSI)  Ethernet over Fibre (dual connection module) Fig. 4: MC12000 Ethernet Service Delivery platformThe MC12000 supports network central Ethernet connection in a number of modes, including; 1. A single aggregated Ethernet connection may be made to the Ethernet port on the Systems Management card, which can then be distributed to any or all remote Ethernet ports linked via Extension Modules within the MC12000 chassis. VLAN Tag switching definitions may be applied to the traffic stream to determine remote port connectivity. 2. Multiple central Ethernet connections may be made to individual modules within the MC12000, for extension either across the particular link served by the same module, or distributed via different modules, as determined by VLAN Tag switching definitions.Network Management connectivity can be effected either via a Serial port on the MC12000 SystemsManagement card, or in principle via an Ethernet port on the Systems Management Card itself or anyother module within the chassis.Ethernet-based Network Management is normally configured such as to be constrained within a singlededicated Management VLAN, which can be designated to terminate within each Access device ifnecessary, in order to avoid propagation of management traffic via user network ports. Ethernet Service Delivery Access over SDH/PDH & Serial Infrastructure Page 4 of 6
    • Carrier Ethernet Services DeliveryFig. 5 below illustrates a typical configuration for the MC12000 used for Ethernet Access connectivityacross different media in conjunction with various CPE Demarcation devices. Metrodata WCM5100 Ethernet/IP Packet network STM1/OC3 SDH/PDH Core / Edge Network Customer Fibre (Terrestrial/Wireless) Site D Metrodata FCM9004 Single E1/T1 Multiple bonded E3/DS3 Customer Metrodata Site A WCM3200 Metrodata WCM1100 Customer Customer Site C Site B Fig. 5: MC12000 used for Ethernet Access concentration over a variety of Network Edge TransportsSetup and ManagementIt is essential that all elements of a Service Delivery network may be comprehensively managed and theMetroCONNECT family embraces this principle. One of the key themes for management of theMetroCONNECT environment is “zero touch” installation for the CPE Demarcation units. Through “zerotouch”, the Demarcation devices are simply physically installed and connected. All configuration functionsare performed from the Providers Management Station(s).One element of “zero touch management” is auto-discovery. When a device is installed, it will activateIEEE802.3ah Link OAM. It will then listen for status requests from the MC12000 Systems Manager.During this auto-discovery phase, the device type and capabilities are retrieved. Metrodata makes use ofthe Organisation-specific Extension capabilities of Link-level OAM to enable a management channel to beestablished. Once this channel has been established, the MC12000 Systems Manager acts as an IPproxy to effectively enable remote device management via TELNET or SNMP.The use of OAM for the management channel also gives the advantage of traffic isolation, since nomanagement traffic will be visible to the customer and similarly the customer will have no access to themanagement sub-systems.To further enhance the management offerings, simple password management may be upgraded throughthe use of TACACS+, and security enhanced further through SSH based encryption. Ethernet Service Delivery Access over SDH/PDH & Serial Infrastructure Page 5 of 6
    • Carrier Ethernet Services DeliveryIn general, the management of Metrodata products can be considered in two phases, configuration andmonitoring. Configuration is normally achieved through the use of a simple, menu driven user interfaceavailable through TELNET or using a web browser and HTTP services. Once a device is configured, itthen enters the monitoring phase where alarms, events and statistics are gathered using SNMP.Additionally, the demarcation devices may generate TRAP indications to signal problems to theManagement System.The MetroConnect MC12000 platform offers extensive performance monitoring facilities as well as in-service and out-of-service test facilities. Where problems are discovered, OAM level loopback tests maybe used to determine the status of links exhibiting problems. These OAM level loops may operate at an“in-service” level where they are not traffic affecting, or as “out of service” tests where the traffic flows aredisrupted during tests.Full details of the MC122000 and indeed of the full MetroCONNECT range can be found at the MetrodataWeb Site, at:http://www.metrodata.co.uk/products/summaries/ethernet-network-access-and-lan-extension.htmWithin the MetroCONNECT range, Metrodata offers products specifically for use as Copper-Copper orCopper-Fibre Carrier Ethernet Demarcation devices, including advanced capabilities for PerformanceAssurance and SLA verification, increasingly required of Ethernet Service Providers by their customers.This topic is examined in detail in our White Paper, "Managing Ethernet Service Delivery", and fullproduct details can be found at the Web Site here;http://www.metrodata.co.uk/solutions/ethernet-extension/carrier-ethernet-demarcation-devices.htm Ethernet Service Delivery Access over SDH/PDH & Serial Infrastructure Page 6 of 6