ODR(on demand routing)

ODR ( IOS 12.0.5T ) enables hub and spoke network structure in the hub router automatically to the spoke router ( also known as the stub site ) to provide a default route, stub site routers do not need to run a dynamic routing protocol, no need to configure any static routing, little system resources occupation, can achieve all the local direct subnet to hub router automatic announcement.

ODR on demand routing

In IOS 11.2, Cisco private.

Configuration command: Router ( config router ODR ) # / * this command only need to use the hub

On-demand routing principles:

Static routing is, must manual configuration, at the same time in the network topology changes after the need to manually update; dynamic routing protocols is, they need to occupy the network bandwidth and router resource. In contains hundreds of branch points in the central branch network, using a static route configuration workload will be very large; and the use of dynamic routing protocols will consume large amounts of resources.

In this case, can be used in third ways: ( ODR ). ODR use Cisco discovery protocol ( CDP ) to the branch router router ( distal ) and central transmission between network information. Compared with dynamic routing protocol, ODR provides the IP routing information with very little overhead; and static routing, ODR manual configuration less.

ODR is only fit for the Central Branch topology. In this topology, each branch and the central router adjacent routers only. The branch router also known as distal router. The distal router may be connected to several LAN, but usually only one to the central router WAN connection. The central router needs to learn each branch router connected to the network, while the branch router requires only one point of the central router default route.

Configure the ODR, distal routers using CDP IP prefix information is sent to a central router. The distal router sends all of its direct interconnection network prefix information. Report of the ODR subnet mask, thus support VLSM ( VLSM ).

ODR relies on the CDP in the Central Branch router router and the transfer of information between routers, therefore in the central and branch router between all link must be enabled for the CDP. By default, Cisco router globally enable CDP, and each interface is enabled on the CDP. However, in some WAN link ( such as ATM ), must be explicitly enabled CDP.

The central router will be a point to their default routing to the branch router, and ODR report of the distal network is added to the routing table, the central router configuration, will make these heavy network distributed dynamic routing protocol. The central ODR router will report the branch router's IP address as the next hop address.

ODR is not a routing protocol to exchange information, because it is limited to the IP prefix and default route. ODR does not report the measure, for the ODR reports of all the central router routing, the metric value is set to 1 jump. However, the use of ODR, can be dynamically informed about the stub network routing information, and there is no dynamic routing protocol overhead requirements; at the same time, without manual configuration, can give the distal router provides a default route.

Requirement specification:

In the large-scale routing in a network, for example in a province - - County - the operating point of the composition of the four remote interconnection routing in a network, how to maintain a lot of business router connected subnet routing and configuration of operating point of the static route became a huge burden. This case illustrates how the use of Cisco On-Demand Routing ( ODR ) technology to optimize the routing network an idea.

Can not be missed eight anti vegetables

Facial muscles occurs when singing rhythmic movement, promote the face blood circulation and nutrient supply, the ruddy face elastic, delaying the skin wrinkle formation. Young tight shiny face is all the people pursue advanced, countless Phytosome product and technology to help people achieve the aspirations of. In fact, do not have to spend big price, in common people table can eat the skin elastic and firm.

Food rich in chondroitin sulfate

Human skin is divided into the epidermis, dermis, subcutaneous layer 3, the impact of beauty is skin leather. The dermis is constituted by the elastic fibers, elastic fiber and the composition of the material is the most important of chondroitin sulfate. The body if this lack of chondroitin sulfate, the skin that has lost its elasticity, the appearance of wrinkles. So, eat rich food containing chondroitin sulfate, can delay the occurrence of skin wrinkles, make skin delicate and maintain flexibility.

The recommended food: pork soup bone soup, goose, chicken soup, all containing cartilage more food is the best source of cartilage.

Foods rich in nucleic acids

Recent studies have found that, nucleic acid supplement foods, can slow the aging process, but also can prevent the emergence of wrinkles. Researchers in 30 women as objects, let them take nucleic acid 800 mg per day and the amount of vitamin C. After a month of observation, 9 individuals on the face of the disappearance of senile plaques, 5 individual wrinkles on the face of the disappearance, 8 rough skin has become more rich, the other people's skin has improved than before.

The recommended food: fish, shrimp, oysters, mushrooms, fungus, honey.

Foods rich in alkaline

Because a lot of alkaline foods rich in minerals and vitamins, minerals calcium to strengthen the skin, enhance skin resistance, eliminate allergy. At the same time, eat more alkaline food can avoid blood to the acidic transformation, maintain the health of human body weak alkaline environment, ensure the normal human the new supersedes the old. And the circulation of the blood.

The recommended food: the vast majority of vegetables, fruits, seafood and bean products.

Foods rich in collagen

Increase in skin collagen with the water storage function, moisturize the skin, keep the skin cells inside and outside the water balance. Collagen is the skin cell growth is the main raw material, can make the skin plump, delicate, so that wrinkles are reduced or disappear, make people look younger. Collagen is the skin 's support, replenish collagen anti-aging is key.

The recommended food: Pigskin, pig, and so on. According to nutritionists analysis, hectogram skin containing 26.4% protein, is porky 2.5 times, but only 2.27 grams of fat, pork half. Especially in the pork skin protein, collagen is the main component.

Rich in natural female hormone food

Female hormones are important factors to keep young women, but with increasing age, female sex hormone will secrete less and less, and it needs from the food supplement certain female hormone.

The recommended food: soybean and soybean products, such as the root of kudzu vine.

Rich in vitamin and mineral food

Vitamin C, E as antioxidants, can prevent subcutaneous fat oxidation, enhance skin epidermal and dermal cells vitality, the skin to prevent premature aging. Iron and copper can make the blood filling the skin, the skin so that adequate nutrition, avoid wrinkles appear early. Pay attention to a diet rich in vitamin A, C, E and trace elements of iron, copper in food, but also conducive to wrinkle.

The recommended food: vegetables, fruits.

Eat more foods with iron

Skin gloss ruddy needed to supply sufficient blood. Iron constitute the main component of hemoglobin in the blood, therefore should eat rich food.

The recommended food: animal liver, egg yolk, kelp, seaweed and other.

Add enough water

Human tissue fluid in the moisture content reaches 72%, adult body water content for 58%-67%. When the human body moisture reduction occurs when the dry skin, sebaceous gland secretion is reduced so that the loss of skin elasticity and wrinkles. In order to guarantee the water intake in adolescent girls daily water intake should be about 1200 milliliters.

Tips:

1, because the skin of human body is exposed in the outermost layer of tissue, so to avoid external stimuli, summer sun, winter cold wind can make the skin becomes coarse. Must according to seasonal changes to take protective measures. Not too frequent washing of the skin. Such as repeated friction will cause the damaged skin cells not regeneration.

2, use of fruit, vegetable topical wrinkle: after the banana mash, add a half tablespoon of olive oil, stir evenly coated on the face of the wrinkle help; watermelon skin water used to wash the face, can make skin refreshing lubrication; loofah can wrinkle, towel gourd juice mixed alcohol and honey, the juice applied to the face, dry rinse with water. In addition, can wrinkle fruits and vegetables and tomatoes, cucumber, strawberry, orange, chestnut etc..

3, can also drink more tea, honey water, amount of beer, to help wrinkles.

4, exercise facial muscles, but also help to wrinkle.

Whistle whistle can wrinkle:" mobilization" facial muscles full motion, thus reducing wrinkling of the facial skin, received cosmetic efficacy. Whistling can make pulse slow, blood pressure reduction.

Sing: sing facial muscles wrinkle occurrence rhythmic movement, promote the face blood circulation and nutrient supply, the ruddy face elastic, delaying the skin wrinkle formation. The singer to sing every day, face aging than average delay of about 5 years.

Mesh

Mesh network is a wireless mesh network"," it is a wireless multi-hop network, is provided by the ad hoc network development, it is to solve " the last kilometer" problem is one of the key technology. In a next generation network evolution process, wireless is an indispensable technology. Wireless mesh can be associated with other network cooperative communication. Is a dynamic can be continuously extended network architecture, any two equipment can keep the wireless internet.

Mesh WLAN network than single hop networks is more stable, this is because in data communications, network performance and not rely only on one of the node. In the traditional single hop wireless networks, if the fixed AP fails, then the network in all wireless devices can communicate. In Mesh network in the AP, if a node failure occurs, it can be to choose a AP communication, data can still be high speed to reach their destinations. From the physical point of view, the wireless communication means the communication distance is short, the communication effect will be better. Because as the communication distance of growth, wireless signal will not only weaken but will interfere with each other, thereby reducing the data communication efficiency. In Mesh network, so a shorter wireless network connection instead of long distance connection, thereby ensuring data with high rate between nodes in rapid transfer . Mesh technology can make the WLAN installation deployment of network expansion, many manufacturers are more convenient. Introduced a feature-rich Mesh products, thus making the deployment of large-scale carrier grade wireless metropolitan area networks become possible. ( specific Mesh techniques that can refer to the relevant manufacturers of technical documentation. ) for example: Strix D The MA protocol ( Strix Dynamic Mesh Architecture TM, dynamic mesh architecture ), so that a wireless access point with automatic configuration of the network, and the network efficiency characteristics. With self-organization, self-healing, updating dynamic network connection, ensuring network security and so on.

Wireless mesh network ( WMN ) based on IP access technology is facing new wireless mobile communication technology, suitable for regional environmental coverage and high speed broadband wireless access. Wireless Mesh networks based on distributed wireless access point to the many mutual cooperation and coordination, with high speed and high spectral efficiency advantage, with dynamic self organization, self configuration, maintenance and other prominent features, therefore, the wireless Mesh technology and the network of research and development and application of wireless mobile communication, becomes the current hot topic, particularly in the future mobile communication system in long-term evolution ( LTE ), the wireless Mesh technology and the network became the center of attention. Ansinet access network wireless Mesh network technology has the following advantages of many there is nothing comparable to this:

A, no single point of failure

Two, fast, flexible networking networking

In three, high performance and non line of sight propagation

In four, high-speed mobile support

In five, with the existing network fusion

Front Side Bus(FSB)

Front side bus "is the name of the AMD launched K7 CPU concept, but has been all mistaken this noun is but another name for intel. What we call the FSB is CPU connected with the motherboard speed, this concept is based on a digital pulse signal based on the shock velocity, while the front side bus speed is the speed of data transmission, the data transmission bandwidth depends on all the while transmitting the data width and transmission frequency, i.e. data bandwidth = ( bus frequency x data ) / 8. The current PC machine can reach the front bus frequency is 266MHz, 333MHz, 400MHz, 533MHz, 800MHz, 1066MHz, 1333MHz, front side bus frequency is higher, representing the CPU and memory transfers data between a larger amount of CPU function.

FSB = Front Side BUS

Line

FSB means CPU and Beiqiao between the chip data transmission bus, also known as the front side bus.

For P4, FSB = CPU * 4 FSB frequency.

This parameter refers to the front bus frequency, it is a processor and motherboard data exchange channel, since it is a channel, which is the bigger the better, now the mainstream in the highest FSB is 1333M, 800M, 533M, 400M downwardly and 333M several, their price is decreasing.

The FSB is most easy overclocking and one of the most common methods. FSB CPU and other parts of the system is connected to the speed. It also affects the memory clock, that is memory speed. In general, the FSB and memory clock both higher is better. However, in some cases it is not established. For example, let the memory clock run faster than FSB does not really help. Similarly, in the AthlonXP system, let FSB run at higher speeds and forced the memory and FSB dyssynchrony ( use will be discussed later in the memory dividers ) on the properties of the block will be run at lower FSB and synchronous memory under a much more serious.

FSB in Athlon and P4 system relates to a different method. On the Athlon side, it is DDR bus, means that if the actual clock is 200MHz, that is running under 400MHz. On the P4, it is "four core", so if the actual clock is the same as the 200MHz, on behalf of the 800MHz. This is the Intel marketing strategy, because of general users, higher is better. Intel" FSB four core" is actually a real advantages, it is less performance loss allows P4 chip with the memory synchronization operation. Each clock higher cycle speed makes it more chance for memory cycle and CPU cycle overlap, it is equivalent to the better performance

FSB decided CPU operating speed, FSB can be achieved by overclocking to improve!

FSB high computer speed will be improved!