局域网如何限速（LAN speed limit）.doc

局域网如何限速（LAN speed limit）How is the LAN speed,or by limiting software using the router? This is qualified as a network administrator如何破解局域网限速, not only to maintain the smooth running of the local area network, control network is aggression, to ensure that the entire network environment can uninterrupted operation, but also on the network resource allocation is reasonable, can not slack in the traffic control based on the entire network may not each use of each port traffic demand, network administrators need to do on the basis of the use of the practice needs to allocate resources to flow, control in port traffic throughput, to avoid the "blocked" image and "grab speed" of the situation。

First, LAN speed limit conditionsIn the LAN speed before practice, we first want to do traffic monitoring in LAN, as long as the flow of each port in the LAN (AC machine and all kinds of network application) know is a full, can draw up a detailed implementation plan and specification limit。 For example, we will use the grass network management software () amount to one or a group of users are a clear know that after the investigation, which obtains the user traffic, bandwidth usage, be able to draw up plans for speed。

Two, the LAN speed limit detailed completion methodDetailed completion methods are divided into two major categories。 One is the speed limit of the port after the speed limit of the AC machine, the other is through the restriction of some specific network speed limit (for example, BT and Internet TV are specially used)。(1) according to the speed limit of the AC machine;1 、 speed limit of access layer AC machineThe access layer of AC machine is also called Louzhuang AC machine or desktop AC machine, the bottom of which is located in network, direct access to the user terminal (family or work users), generally speaking this kind of machine is the exchange sale, no management function, but also have some communication with our machine can limit the demand of port (of course, the price is slightly higher point)。

This type of AC port speed limit is often very direct, and some can even go through graphical interfaces, in the form of drop-down menus, it is intuitive to set dozens of K to 100M port speed2 、 convergence layer AC machineFriends may ask, is the access layer of the AC machine has power port rate limit done very well, then we all use AC machine such network do not, the answer is, we still need to use in the convergence layer, higher level of AC machine。 In addition to the stability of the AC machine operating in the convergence layer, there is also an important technical indicator, that is, the backplane bandwidth, which determines whether this AC machine can complete the wire speed forwarding。

If the AC machine backplane bandwidth discrimination enough? Calculation methods are as follows: the port number * corresponding port rate *2 (full duplex form), for example, AC machine 24, ports are required to work in the 100M, then the backplane bandwidth of at least demand: 24*100*2=2。4G, and backplane bandwidth CISCO29 series AC machines are in the 8G above, with line speed forwarding is no problem。 But at the moment, we haven't found a way to speed up the port on the CISCO29 series。

3 、 central layer AC machineThe AC machine center layer in addition to support VLAN, TRUNK, ACL and so on the function, its function is to ensure that the center of each port between the rapid data forwarding, thus limiting them port often is not simple to set up a numerical OK, the whole process should be divided into four:1) set up a call control list (ACL);2) set up a class (CLASS) and cite the newly established call control list (ACL) on this class;3) set up a strategy (POLICY), specify the appropriate bandwidth on this strategy, and quote the appropriate classes;4) apply this strategy to detailed ports。

When we do this well, the bandwidth usage within the local area will be bound by an order of magnitude, for example, the bandwidth usage of the usual 8 and 90M will drop to 6 and 70M。Of course, we can also explore the high-end use of the center layer AC machine,For example, after the port after constraint some way to restrain some network use (for example, but the practice of thunder download) bound function is not too good, because such programs actually use thunder messy network protocol, but some port constraints is very difficult to fix, so still rely on professional flow control equipment。

(two) speed limit based on local area network;According to the professional flow control equipment to speed limit flow control equipment this paper takes a test before we clarify the method, the device is located between the US Bureau of hardware firewall and broadband user management equipment, can use for a certain kind of speed, for example, we want to in the whole network P2P download a limited band。 You can do it this way。1,select "P2P download constraint" in the "strategic settings""。

You can see that the P2P download contains many applications如何破解局域网限速, such as the "Thunderbolt", "eDonkey" and so on。2, in the "flow control" set up and down flow constraints。3, also can set up bandwidth to assign our network。The practice shows that the use of the network according to the speed limit is useful, we are only in the network constraints P2P download this kind of use, not do port constraints of AC machine, is also the success of the bandwidth usage is reduced, and then ensure the normal reading, "send and receive mail application。

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