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Comprehensive solution for Ethernet access network and backbone


QTECH offers complete technological solutions for efficient construction of multi-service networks based on modern equipment that optimally combines functionality and cost in relation to the specific conditions of the customer.

QTECH specialists travel to the installation site for early initial configuration of equipment, personnel training, refinement and optimization of operation schemes, interaction with existing network elements and introduction of new services.

Basic network services

The result of the implementation of this project is the creation of a multi-service data network (MRTD) for all categories of users, ensuring high network security, reliability of services with the quality of service to the relevant classes of services and an effective system of management and accounting of user work. The solution is based on modern equipment with an optimal combination of price and functionality parameters with the reliability of the operator class.

The proposed solution allows you to create a number of services provided to network subscribers:

  • IP TV wide range of channels
  • HD TV quality for modern TV receivers
  • Video on Demand video rental at home and live recordings
  • IP telephony effective rates and WiMax
  • IP VPN office virtual networks
  • L2 VPN office virtual networks
  • Digital Audio

At the first stage, effectively implement the following services:

  1. data Transfer of access from the Internet
  2. Streaming video (multichannel IPTV)
  3. VoIP (SIP, N. 263) with support for at least 3 types of codecs;
  4. E-mail
  5. Virtual cinema (VoD)
  6. video on Demand (VoD)
  7. Time-shifted TV, with implementation both on the subscriber equipment side and on the MiddleWare side
  8. audio on demand (AoD)
  9. Gambling-gambling (video casino, video loss, etc.)
  10. create and host UGC
  11. web surfing
  12. FTP services
  13. Hosting
  14. Co-location

Equipment in accordance with the requirements of network Metro Ethernet Triple Play

Access switch QTECH QSW-2900 24 port FE and Gigabit uplinks, supporting Protocol for ERRP to ensure that the rate of convergence is less than 200 MS, and a complex of means of maintenance of transport multiservice network, including GVRP, MSTP, QinQ port based and selective QinQ, MVR, IGMP v.3, 1024 multicast flow, 16 million VLAN (4K + QinQ), Ethernet Security, Attack defend, IP Source guard, broadcast storm suppression, multicast and unicast, three types of QoS and four QoS queues on each port, a powerful switch factory to ensure multicast distribution and quality of service "at the speed of wires", the ability to connect a backup power supply.

The QTECH qsw-3900 distribution switch and network core has 24 or 48 GE ports (4 of them are RJ45 combos) and the ability to install 2 or 4 10g interfaces. Fully supports all protocols and technologies listed in the QSW-2900, including the ERP Protocol for convergence rates of less than 200 MS, as well as a number of additional features, including IP routing and multicast traffic (OSPF protocols, PIM-SSM), the Protocol "virtual router" VRRP, 256 IP interfaces, 64K IP routing entries, 8 QoS queues per port, two power supplies. Two power supplies, two images of OS and quality of components guarantee steady work.

Both switches are designed for a wide range of operating temperatures from -15° C to 55° C. they are Fully equipped for use in Metro Ethernet Triple Play networks and schemes to ensure reliable backup of transport networks – Dual Homing and VRRP&ERP.

Circuit solutions to meet the high reliability requirements of Metro Ethernet Triple Play networks

ERRP Protocol

At the organization level of the Ethernet ring, the ERRP Protocol is used, providing a convergence rate of less than 200 milliseconds.

The ERRP Protocol allows you to configure up to 16 domains at a convergence rate of 50-200 MS. The principle of the Protocol is that the ring configuration is known in advance in the event of corruption, primary and secondary ports are assigned on each switch. The domain Master is responsible for switching the topology, one of the ports of which is initially blocked and will be opened in the event of a disaster.

The Protocol can be used in complex-ring topology configurations, as in the above example topology.

VRRP Protocol

Connection of end devices, network servers and reservation of external communication lines of the network segment is carried out by means of the Protocol " Virtual router»

The principle of the Protocol is based on the ability to declare one IP address on two different switches, one of which is the master of this address, and the second switch constantly checks the presence of this address in the network and, in the event of a master or link failure leading to the master, raises this ip address on its interface. Simultaneously with the ip address, the MAC address can be moved with the notification to downstream devices.

Moreover, it is possible to cross-reserve, when the switch A, being the master of address A, at the same time is the reserve of address B, and the switch B, being the master of address B, at the same time reserves the address a

QTECH qsw-3900 switches can support up to 255 virtual routers simultaneously.

dual Homing Topology

Allows you to organize reliable connections without interruptions of key network resources based on the availability of backup links and two or more network interfaces. In conjunction with the VRRP Protocol can be applied on all the important areas of the network.

In this connection scheme, there are workarounds to provide communication even if several devices or connecting lines fail.

Structural scheme of the network with the implementation of the "VLAN for service" and a guaranteed quality of service

The principal modernization of the network is the use of low-cost switches with support For QinQ functionality at the access level, not only QinQ port based, but also QinQ Selective. The use of this technology at the level of access switches allows for all categories of users to divide traffic by type of services and provide quality of service separately for this type of services.

In the network core scheme, the dual Homing topology is widely used to ensure reliable trouble-free connection of key network resources to the subscriber load.

In a larger network, aggregation switches are installed at the district level to form a backbone ring:

Qsw-3900 routing switches can provide local traffic routing.

The use of MSTP/ERRP protocols at the distribution levels ensures minimum convergence time in the event of damage.

The use of QinQ Selective allows you to implement "VLAN to service" at the level of the provider's network and ensure the priority delivery of real-time services in the organization of VPN.

Even in the case of laying one optical cable in the direction can be looped at the end of the fiber thread, which will be a logical ring, and the lack of power on the switches in the middle of the ring will not stop services on other switches.

The proposed redundant scheme "flat rings" + Dual Homing with fast convergence technologies MSTP/ERRP:

  • Redundant switching scheme to two separated reference nodes (Dual Homing);
  • in the event of a power failure, all or part of the access switches are redirected through the second reference node, the use of VRRP protects against a reference node failure;
  • the
  • Saving of the fibers allows not to use expensive Bi-Dir WDM SFP, and the availability of fiber to use to connect the new "flat rings" and backup routes of a highway;
  • the 50-200 millisecond convergence rate of the ERP Protocol ensures trouble-free operation of real-time VoIP &IPTV;
  • services the
  • Control switches are simultaneously and equipment highways 10G.

Each user of Metro Ethernet network can receive a set of Triple Play= High Speed Internet+VoIP+IPTV services. But how to divide the traffic of different services, provide QoS and ensure the passage of a large number of VLANs? QinQ Selective technology allows to classify traffic by type of services on the client port and form three VLANs on the network interface (uplink) – One QinQ tunnel for HSI (Internet), the second - QinQ tunnel for VoIP and MVR for multicast.

The main double ring can be organized on two fiber threads with the use of WDM SFP Bi-Direction and support for mutual redundancy by Central switches.

It is possible to gradually increase the speed of the trunk to 10 Gbit/s on several links by installing 10g cards with XFP modules in the qsw-3924 switches, the architecture and performance of which provide support for these interfaces.

user control and accounting Equipment

During the initial network deployment phase, BRAS functions can be assigned to one or more servers running the Free BSD operating system, but this solution is only applicable for small networks with several hundred one-time sessions. A broader solution requires the use of specialized devices that support more than 8,000 simultaneous sessions.

The principal feature of modern schemes of accounting and control of users is the transition from NetFlow, taking into account each package, to the Protocol Radius allows you to monitor user sessions by direction and the ability for users to dynamically change the set of services provided. SQL databases are used to accumulate statistics. Ensure the requirements of COPM is based on the functions of mirror, which is supported by all equipment.

Access switches accept users already distributed over individual VLANs, aggregate VLAN data using QinQ technology, transmit information about the user's port of entry and VLAN to the router, and provide conditions for passing traffic of different categories.

Supporting Protocol for dynamic VLAN registration - GVRP, the switch distribution automatically interact to pass client VLANов to the core network or between themselves, in the case of the VPN based on VLAN on QinQ technology.

The main schemes of BRAS location in the network are distributed or centralized:

  • Distributed BRAS scheme - involves the installation of BRAS at district switching nodes and is effective when using ADSL technology and DSLAM equipment or when a large distance of the network segment from the Central highway. A feature of the scheme is the need for full redundancy of the equipment on boards of management and line cards and interfaces, i.e. almost double redundancy on the equipment due to the inability of the organization of the mutual redundancy of the remote devices.
  • Centralized scheme BRAS - involves the installation of equipment in the core of the network, on a high-speed line with the possibility of mutual redundancy. This scheme is the main for Metro Ethernet solutions and can significantly reduce costs, because it does not require a full backup of the boards on individual devices.

At the first stage of network deployment, it is possible to use one BRAS, but it is desirable to initially provide for the installation of two BRAS without the configuration of Full Redundancy with the possibility of mutual redundancy:

Standard distribution

In this project, the core level includes OSS/BSS equipment, anchor points, information security and management, and the distribution level of the Central trunk ring.

At this scale of the network at the transport level, it is possible to use the same type of QTECH QSW-3900 equipment both as Central switches and backbone switches. That allows you to organize the entire network within a single Protocol and technology.

Dual Homing topology allows you to make a guaranteed connection from the network of key resources on the basis of binding simultaneously to two Central switches.

At the access layer and distribution apply a Protocol of rapid convergence of Ethernet ring ERRP provides switching of threads for 50-200 mlsec., which is supported by QTECH qsw-2900 access and QSW-3900 distribution switches within a single system, providing guaranteed reliability.

Connecting key network resource is made directly to the switches of the highway or using the access switches. In both cases, the dual Homing topology works.

It also connects to a higher network based on two communication channels.

Table of main technical requirements of core and distribution equipment:

Paragraph The requirements of the core Level and aggregation) Equipment
One Topological reservation (reservation of communication lines) Yes Support for Dual Homing topology, virtual router VRRP protocols, and LACP loading balance
Two Redundant Ethernet ring and providing rapid convergence of 50-200 MS Yes ERRP Protocol
Three Power backup (each device has two power supplies) Yes Two power supply units
Four Possibility to install 10g interfaces Yes 2-10G(QSW-3924) or 4-10G (QSW-3948) standard XFP modules
Five OSPF internal routing Protocol support Yes  
Six Support for IP multicast PIM routing protocols Yes PIM-DM, PIM-SM
Seven Support for at least 500 IP multicast groups Yes 1024 groups
Eight Protocol support dynamic registration villeins GVRP Yes  
Nine Support at least 2000 VLANs per device. Yes 4K + QinQ
Ten Supports a routing table of at least 32,000 addresses per device Yes 64K
Eleven Support MAC table of at least 16000 addresses per device Yes  
Twelve Support technology port based QinQ and selective QinQ Yes  
Thirteen MSTP Protocol support Yes  
Fourteen Wide operating temperature range Yes -15° C to 55° C

access Level

The access layer is implemented on L2+ switches with network architecture – VLAN per user at the access level and VLAN per service at the distribution level. With the ability to authorize users on PPPoE and Clips (DHCP op.82, DHCP snooping and IP Source Guard). Allowing you to provide a full range of services, including L3 VPN and L2 VPN.

The QTECH qsw-2900 switches support QinQ port based and QinQ selective technologies to provide VPN and Triple Play services, respectively. Using MSTP allows you to create ring structures without locking the ring.

Support for the SWAP-VLAN feature ensures fast network deployment by having the same primary configuration on all switches with minimal on-site correction.

The use of qsw-2900 switches at the access level allows you to organize the overall structure of network construction and service provision very effectively.

Support for the ERP Protocol allows for ring redundancy with a recovery time of 50-200 MS.

Table of compliance with the technical requirements of Metro Ethernet Triple Play network:

Paragraph Requirements-access Level Equipment
QTECH & nbsp;QSW-2900-24
One L2 managed Ethernet switches Yes Level 2 plus
Two Redundant Ethernet ring and providing rapid convergence of 50-200 MS Yes ERRP Protocol
Three Number of interfaces 100 Base-T on one switch at least 24 Yes  
Four Number of Optical Gigabit Ethernet ports at least 2 Yes  
Five Power supply 220 V (AC) or -48 V (DC) Yes  
Six Low power consumption and low heat generation Yes 25 W
Seven Passive cooling system (optional) Yes  
Eight Wide operating temperature range Yes From -15° C to +55° C
Nine Body material-metal Yes  
Ten Compact dimensions for easy placement in cabinets Yes 440 mm * 160 mm * 44 mm
Eleven MSTP Protocol support Yes  
Twelve Support for GVRP Yes  
Thirteen Prioritization VLAN IEEE 802.1 p/Q Yes  
Fourteen Support for at least 4 QoS queues per port Yes  
Fifteen Q-in-Q port based &QinQ selective Yes  
Sixteen Layer 2 isolation Yes  
Seventeen Suppression of storms of broadcast and multicast Yes  
Eighteen Unicast storm suppression Yes  
Nineteen Ethernet Security Yes  
Twenty DHCP Relay Option 82 Yes  
Twenty one DHCP snooping, IP source guard Yes  
Twenty two IGMP snooping Yes  
Twenty three Multicast VLAN registration, MVR Yes  
Twenty four IGMP fast leave Yes  
Twenty five Support for multicast groups of at least 500 Yes 1024 groups
Twenty six LACP-based link aggregation Yes  
Twenty seven Management SNMP, FTP, TFTP, SSL, SNMP v.3 Yes  
Twenty eight MAC addresses-8000 Yes Nine thousand
Twenty nine Jumbo frames for QinQ and VPLS pass Yes  
Thirty VLAN IDs – 2000 Yes 4K+QinQ
Thirty one Syslog Yes  
Thirty two SNTP Yes  

Basic network services

All modern services and services simultaneously for different categories of users when using QTECH equipment can be provided at level 2 Ethernet network. However, providing different services requires different implementation.

high Speed Internet

The primary mechanism for skipping client traffic can be PPPoE sessions or CLIPS (DHCP op.82 plus IP Source Guard) terminated and routed to BRAS. In this case, all Hsi traffic passes through BRAS.

A mixed scheme of PPPoE and DHCP authorization can be applied, when only paid traffic passes through BRAS, which interacts with Radius, determines the bandwidth of external traffic for each group of users and collects pre-billing information, and local traffic that does not require accounting can be directed bypassing BRAS on the principles of IP routing, based on local addresses.

To prevent switching loops at the access level on the part of subscribers, the use of STP Protocol is undesirable. To protect the network, QTECH equipment allows using Remote loop detect and Broadcast limit tools instead of STP with the possibility of separate filtering of broadcast, unicast and multicast storms with reference to the real speed of each port.

The provider will use the MSTP Protocol at the access and distribution levels, eliminating the mutual influence of different network segments and ensuring stability, minimum convergence and recovery time, dictated by the nature of the services provided, which are often critical to delays and downtime of the transport network. Some parameters and values must be configured manually according to the domain topology and are based on calculations. Please note that the use of MSTP allows you to avoid breaking the ring and provide full non-blocking bandwidth, but only with careful configuration and application of QinQ technologies.

Switches QSW-2900 allow the access level to collect all user VLANы Internet access in one transport VLAN selective QinQ technology, which also allows all user VLANы VoIP packaging other transport VLAN and multicast traffic to leave out of the tunnel to avoid duplication of multicast streams.

For the organization of VPN L2 will be Used QinQ port based technology and, therefore, each switch QSW-2900 will transmit all Internet traffic in One QinQ VLAN, all VoIP traffic in another QinQ VLAN, multicast in MVR, and each VPN in a separate VLAN on VPN. Function swap-vlan allows you to copy the base configuration from switch to switch with a further slight correction of the numbers of motor VLANов each switch in accordance with the General scheme of the network.

The open Shortest Path first (OSPF) Protocol can be used as an internal routing Protocol. The network can be divided into several OSPF areas.

VoIP packet telephony

Provision of Internet access and ip-telephony services to one subscriber at the same time with the corresponding classes of service is possible due to the support of qsw-2900 switches with QinQ selective technology and the possibility of one port belonging to several VLANs.

Each port of QSW-2900 supports 4 QoS queues, which is enough for both Triple Play and corporate VPN, because Internet access is usually delivered without special conditions.

There are several options for VoIP with the connection of conventional telephones:

  • installation of individual single-port gateway directly at the subscriber,
  • the
  • to install multi-port gateway next to the switch and use the spare pairs of the twisted pair cable to connect phones
  • in case of corporate customer - installation of CPE router with multiple Ethernet and FXS ports.

There are QTECH QVI-1100 series VoIP end-gateways with different number of ports and QTECH QVI-5300 trunk gateways for communication with classical telephony network via E1 streams.

IPTV digital TV including VoD and HDTV as well as video conferencing and game servers based on multicast

These types of services belong to the multicast traffic type and require separate protocols.

The main difficulty of this service is optimization of multicast streams and elimination of duplication.

The qsw-2900 switches provide a per-user VLAN at the access level with traffic-type filtering to avoid mutual influence and unauthorized actions at the user level with technologies:

  • Cross-vilan-multicast to avoid duplication at the switch level
  • IGMP snooping to form multicast mac groups
  • IGMP "Fast leave" for fast channel switching
  • MVR to protect against unauthorized actions and optimize the passage of this traffic on the trunk links.
  • IGMP queerer to optimize multicast routers

Switch-routers QSW-3900 supports the functionality of multicast routers and Protocol PIM-SM.

Fundamentally the multicast traffic is not Packed into the tunnels QinQ, and is transmitted in a separate VLANах with the appropriate prioritization.

In the case of STB to connect TV receivers to the IPTV network, the user needs a compact low-budget switch with support for traffic prioritization and remote control. Such a device can be QSW-2500-5.

VPN Organization

Virtual private networks can be of the second and third levels and are in demand mainly by enterprises with several offices.

VPN L3 requires switching private IP packets between sites, which is possible on the basis of IP tunnels with switching in the core of the network or on qsw-3900 switch-routers.

In this case, you need to install the CPE router on the customer's site.

The organization of VPN L2 requires the delivery of Ethernet frames of the customer from point to point of the network, which is possible on the basis of the QinQ port based technology, when a rule is set on the access switch port - all client VLANs coming to this port are assigned one transport number, which is used for delivery over the network to the endpoint where the transport tag is removed, and frames with original tags are given to the client.

The customer's website can be connected directly to the port of the provider, with the formation of "VLAN service" And QoS technology QinQ Selective.

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