Shenzhen Business Newspaper Network System Project Example

I. Outline

Shenzhen Commercial Daily is the largest circulation newspaper in Shenzhen, is reported by Shenzhen market government agencies, and one of the important party newspapers of Shenzhen Municipal Party Committee. Advertising income ranked top 10 in the country for two consecutive years (1999, 2000). At present, there are more than 2,000 employees, a newspaper building with a building area of ​​more than 60,000 square meters and 22 floors, a 28-storey Olympic Building and a 7-story Printing Building. Apart from publishing 40 editions of the Shenzhen Daily Daily, there are Shenzhen Evening News (40 issued in Japan) and Shenzhen Metropolis Daily (issued weekly in 68 editions) and some magazines.

With the large-scale development of newspapers, there are more and more information exchanges internally and externally, and the technical requirements for the quality and transmission speed of information are also increasing. In order to adapt to the needs of the large-scale press groups operating in the new situation, an efficient and stable computer network system must be established, and a software system such as news gathering and editing services within the newspaper industry must be applied.

This article focuses on the construction, planning, and implementation of the Shenzhen Business Newspaper network system.
Second, network construction goals and principles

1. Network construction goals

The construction of the network system is mainly for the publication and distribution services of Shenzhen Commercial Daily and its sub-subsidiaries. Specific applications include the following aspects:

News editing system: information retrieval system; advertising management and design system; issuance management system; laser phototypesetting system;

2. Network design principles

Shenzhen Daily has a large amount of publishing information data and management information data every day in the network system. It has very high requirements for network performance and must ensure the normal and stable operation of the entire newspaper company network. Therefore: the design of the network system we adhere to the following five principles:

1 Openness and scalability;

2 technological advancement and economic practicality;

3 high speed and safety reliability;

4 compatibility and system scalability;

5 unified planning, step-by-step implementation, hierarchical management.

3. The choice of network technology

The technical backbone of the newspaper's technical department conducts in-depth research and analysis of today's major network technologies. According to the specific conditions of Shenzhen Commercial Daily, it is believed that Gann Ethernet is most suitable for the newspaper industry. Below we have done several major network technologies. A comparison.

1ATM network technology

ATM (Asynchronous Transfer Mode) is a cell-based, connection-oriented network technology that provides quality of service for real-time applications and is ideal for real-time multimedia applications. However, in traditional data transmission applications (typically IP data), it does not provide guarantee of service quality. When transmitting IP data packets in ATM, if IPOA is used, SVC needs to be established for each data transmission (switched virtual circuit). ), great delay. If PVC is used, a permanent virtual circuit needs to be established for each communication party, and the flexibility is relatively poor. With MPOA, the MPOC Client needs NHRP to resolve to the destination ATM address and then establish a direct SVC to the destination address. The entire process requires NHRP address resolution and SVC establishment. Therefore, this method only works. Suitable for large ATM networks with more hops. When the LANE mode is used, the LEC (LANE Client) resolves the MAC address to an ATM address before sending the data, and then establishes an AMC address to be resolved to an ATM address before sending data, and then establishes an SVC to the destination address with the same delay. Moreover, IP data packets are packed into ATM cells, and about 20% of the data are additional headers. Therefore, low efficiency is also a disadvantage of ATM. For the business system, which is mainly based on data transmission, there is no advantage in terms of performance and price.

2 Gigabit Ethernet Technology

Ethernet technology is a network technology based on competitive transmission and collision detection. Its characteristic is that when the network traffic is low, the data transmission delay is very low, but when the network traffic is relatively high, the network performance drops sharply. Its characteristic is simple, practical. With the adoption of switching technology, Ethernet's shortcomings of low network performance when network traffic is high are completely eliminated, and the simple nature of Ethernet is preserved. Now, Ethernet has passed through switched Ethernet and Fast Ethernet to reach Gigabit Ethernet. The speed is 1Gbps, and due to the development of 802.1Q (VLAN), 802.1P (Priority Control Signaling), IP, QoS, and RSVP technologies, not only traditional data services but also real-time multimedia can be transmitted over Ethernet. Application is a network technology with broad development prospects. For the specific case in which Shenzhen Commercial Daily adopts data applications, the adoption of Gigabit Ethernet technology is applicable both technically and economically.

3 Other network technologies

Such as FDDI technology, due to high cost, complex structure, for the backbone of the enterprise LAN is no longer considered.

4. The choice of network product manufacturers

For the choice of network product manufacturers, we finally use a Cisco network product. Here we compare several large network manufacturers:

BayNetwork: BarNetwork's network product performance is relatively high, but its poor manageability, not easy to use, and after the acquisition, the prospect is unknown.

3Com: 3Com's network products have advantages in its low-end products, and its high-end products have no advantage in terms of performance and manageability.

Cisco: Cisco is the world's largest network product company. Its high-end switches, routers, and switching routers all have the largest market share. Its products have high performance and good manageability, especially its IOS (Internet operating system) penetration. Its entire network product line provides users with functions such as security management, performance optimization, system management, and application services, and is unmatched by other products.

5. network management

1 Selection of stations for network management work

The network management workstations provide long-distance management of the entire network system. Therefore, the network management workstations have higher security, reliability, and ease of operation. In terms of device selection, we use SUNULTRA5 as a network management workstation.

The configuration is: Ultra 5 configured as a 333MHz UltraSparc II processor, 9.1GB 7200RPM internal Fast/Wide SCSI-2 hard drive, 128MB RAM, Sun Creator 3D graphics accelerator, 21" color monitor.

2 Inspection of the network management software

The website workstations are installing SOLARIS operating system and CISCO WORKS 2000 (including CWSI CAMPUS and CISCOVIEW, etc.).
Third, the design of the network system program

1. Core switch

CISCO’s Catalyst 6509 product is used as the core switch of the network. It is designed to meet the growing demand for Gigabit port density, scalability, high availability, and multi-layer switching in the core/distribution layer and server aggregation environments. Has the following characteristics:

1 Scalability: The provided bandwidth reaches 32Gbit/s, can be expanded to 256Gbit/s, throughput can be expanded to 150 million bps. In addition, the module can be expanded to 9 and can support FDDI and ATM. With Gigabit Ether Channel, up to 16Gbps of logical connections can be achieved.

2 to achieve a stronger control and greater flexibility. Logically, VLANs and subnets are used to segment the data stream of the workgroup and provide security. At the physical layer, layer 3 switching is implemented, and the routing speed between VLANs is greatly accelerated.

3 Provide continuous availability. Utilize device and network-level redundancy and recoverability to provide uninterrupted availability for critical operations. The Catalyst 6509 has a mean time between failure (MTBF) of 7 years.

All system units, including power supplies, fans, supervisors, circuit board modules, and switching backplanes, are hot-swappable. SpaningTree spanning tree technology is used to support automatic fault recovery using the Hornet Backup Routing Protocol (HSRP) in case of catastrophic failure. When you can quickly switch to the backup system.

2. Floor exchange

Each floor network switch uses CATALYST5509 and CATALYST5505. It is connected to the core switch through Gigabit fiber. The trunk is four 1000M fiber channels, the bandwidth is 8Gbps (full duplex), and the medium is 4 pairs of multimode fiber; the redundant trunk is 400M fast. EtherChannel has a bandwidth of 800 Mbps (full-duplex) and uses four unshielded twisted-pair cables of five types as the transmission medium.

The 6/F5509 is used as a backup for the core switch 6509, the backup trunk uses 100M bandwidth, and the Cisco 3640 implements inter-VLAN routing.

The original printer file was equipped with a 2948G, which was connected to the 6509 through an outdoor optical fiber.

3. Network VLAN implementation

According to the different applications of different information points, different access rights, and the purpose of network optimization, VLANs are divided. The benefits are as follows:

First, effective bandwidth utilization: By dividing the network into small broadcast domains or subnets, VLANs solve the scalability problems found in large “flat” networks. All data streams, including broadcast or multicast, are restricted to the subnet. In order to enable information to reach different VLANs, routing must be done through Layer 3;

Second, security: VLANs provide security by forcing layer 3 routing between VLANs. If inter-VLAN communication is configured, the router's traditional security and filtering functions can be used.

Third, load balancing multiple paths: VLAN allows Layer 3 routing protocols to intelligently determine the best path to the destination. When there are multiple paths to the destination, load balancing can also be performed.

Fourth, isolation of faulty components: One of the important reasons to implement VLANs is to reduce the impact of network failures. In a "flat" network, a failed device, network loop, or broadcast-intensive application may potentially affect the entire network until it completely fails. One of the most effective measures to solve this kind of network failure is to correctly segment the network and set up routers between the network segments. A router can effectively prevent faults from spreading to other segments or VLANs, and can fuse faults on a limited number of devices on a single VLAN.

1 VLAN division

a. All network devices (switches, routers) on the intranet are VLAN 1, and the network management is also divided into VLAN 1.

b. The server is divided into two VLANs, the database server, Web server VLAN2, OA server VLAN3

c. Each department of the business newspaper can divide the corresponding VLAN according to the actual situation according to the difference of business and authority, the VLAN number is 10-100.

d. The external network does not divide the VLAN.

2 routing implementation

MSM in the Catalyst 6509 is used to implement inter-VLAN routing. Four Gigabit interfaces are combined into a channel-group using the Gigabit Ether channel technology. Then a Port-channel is used as a sub-interface to define the gateway of each VLAN. The inter-route routing protocol uses the eigrp protocol.

4. Internet production

Slightly here, because the internal and external networks of the newspaper adopt a physical isolation method, we have another article about this.
Fourth, the network system topology