L3 switch solution for Internet cafes

VLAN Division

In the Internet cafe environment, many netusers use a variety of software: games, QQ, video communication, browsers, during communication, these applications will generate numerous data packets transmitted both in and out of the network. This transmission is based on the broadcast mechanism in the LAN switch environment, therefore, the spread and collision of broadcasts are inevitable. When many clients, but all of them belong to the same subnet, broadcast storms often occur in this lan. The consequence is the overall decline in network transmission performance. We need to use VLAN to divide this large broadcast domain into several smaller broadcast domains, so that the broadcast produced in each small broadcast domain will be confined to it, and the broadcast storm will be generated less. This solution divides three VLANs into three layer-3 switches, so that each 40 clients are distributed in a relatively small VLAN with a small broadcast domain ).

What is layer-3 switching? What are its advantages?

Traditional switches work on the layer-2 data link layer of the layer-7 network model and can only identify the hardware addresses of the MAC address network device ports ). Layer-3 switching means that network devices can identify layer-3 network information IP addresses and use this as a basis for fast data exchange. The layer-3 switch can implement the network layer functions that the original router can complete, such as: Routing), while the delay in Data Forwarding is far lower than that of the router, it can achieve the high-efficiency line speed only available on the second layer switch ). The layer-3 Switch generates a ing table between the MAC address and IP address after the first new packet is forwarded. When a packet with the same address information passes through again, that is, based on this table, forwarding is directly completed on the second layer, that is, "one route, multiple exchanges", which effectively improves the efficiency of data packet forwarding. Therefore, it can be said that it is a combination of the advantages of layer-3 routing and layer-2 switching.

Why do I select a layer-3 Switch to implement IP routing between VLANs?

To divide VLANs, you must have IP routing between VLANs. Before the emergence of a layer-3 switch, a traditional router is used to implement the above functions, because layer-3 Switch has the advantage of wire speed in route forwarding. In this case, layer-3 switching is also based on this reason-it can achieve line-rate IP routing between valns. This is also the reason why a large number of layer-3 replacement machines are used in high-performance LAN. Therefore, layer-3 switches have significant performance advantages in a large and high-performance switching environment, which is the top priority of this solution.

Ii. TRUNK-use TRUNK to achieve load balancing on the uplink of the switch

TRUNK indicates port aggregation. It is to configure the software of the switch to combine the four physical ports into a logical port and merge the bandwidth of the four ports, A 4X2X100 MB = MB exclusive high bandwidth is provided for the port. The TRUNK function is suitable for the following applications:

1. The TRUNK function is used to connect to the server and provide the server with an exclusive high bandwidth;

2. The TRUNK function is used for cascade between switches. By sacrificing the number of ports, it provides bundled high bandwidth for data exchange between switches, improving the network speed and breaking through the communication bottleneck between switches, this greatly improves network performance.

In order to reduce the total cost of ownership, TUNK technology can be used in the solution to achieve cascade between switches, rather than directly using Gigabit ports. In this solution, three trunks are configured for the layer-3 switch, and one TRUNK is configured for the layer-2 Fast Ethernet switch. Each group of trunks is configured as a VLAN.

3. Broadband routers-use broadband routers for INTERNET proxy sharing

Through the understanding of various media, I think everyone has a good understanding of the Broadband Router. Here I want to mention that although the Broadband Router can also implement the IP routing function between VLANs, however, it is cost-effective for small VLAN applications, but it is better for large and high-performance applications to replace it with a layer-3 switch.

Device selection for high-performance internet cafes

For high performance and optimal cost, this solution selects the following devices:

Layer-3 Switch-Huawei S3526 route Switch

QuidwayS3526 is a two-or three-tier line rate Routing Switch launched by Huawei for the network convergence layer of the broadband IP metropolitan area network. The network operating system provides a sound routing protocol, VLAN control, traffic switching, and QOS Assurance Mechanism, it provides complete business control and user management capabilities, and is an ideal product for IP Broadband Metropolitan Area Networks. Supports VLAN Trunking. Port Configuration: 24 10/100 BASE-TX ports and 2 GE expansion module slots. Five GE extension modules are supported. Due to cost considerations and sufficient bandwidth performance, this solution does not use the GE extension module, but uses the TRUNK technology to achieve MB uplink bandwidth. This scheme requires one purchase.

Quidway S3050 Ethernet switch is a L2 line rate product featuring high port density and high cost effectiveness, it can be widely used in Internet broadband access networking, providing multicast service functions, networking support for group broadcasting, video services and on-demand video services), enterprise network and campus network networking and other fields. Supports VLAN, port aggregation, and port broadcast storm suppression. In large and medium-sized enterprises or institutions, the S3050 Ethernet switch acts as a two-layer aggregation switch. The following is attached to the Huawei S2403H or 2000/2000 B series Ethernet switches for 10 MB/MB access, or you can directly access users, uplink connection to Huawei S3526. The fixed port has 48 10/100 MB Ethernet ports and two expansion slots. It can be connected to the Fast Ethernet module and gigabit module. This scheme requires three purchases.

Vigor2104 is an ideal solution for small and medium-sized enterprises and large Internet cafes to share their Internet access, featuring low price and high performance. The broadband interface supports Cable/ADSL modem or other Ethernet-based broadband access. It is easy to configure through WEB-based user interfaces and wizard; NAT and VPN penetration functions; built-in firewall; DDNS support for hosts with dynamic IP addresses; UPnP (Universal Plug & Play) supports multimedia applications. 4-port 10/100 Base-TX switch LAN port, a 10/100 MB Base-tx wan port. This scheme requires one purchase.

TF-3239D card uses Realtek RTL8139 chip, is a high performance 10/100 MB adaptive ethernet card ,. The card has the automatic negotiation function, which can automatically identify the rate and working mode of the connected switch, and automatically switch between 10BASE-T and 100BASE-TX, automatic Identification and adjustment of transmission mode and transmission speed, full/half duplex, 10 MB/100 MB ). LED indicators and diagnostic software can be used for simple troubleshooting; plug-and-play

The network topology implemented for the above scheme:

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