How to choose appropriate fourth layer exchange

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1) speed Cisco 3750V2 In order to in the enterprise network effectively, the fourth layer exchange must provide performance with third layers of line rate router can match. That is to say, the fourth layer exchange must operate in full medium speed on all ports, even in a plurality of Gigabit Ethernet connection and so. Gigabit Ethernet speed equal to the maximum speed of routing per second to 1488000 packets (assuming the worst, that all packages as well as the minimum size, network defined length 64 bytes). 2) server capacity balance algorithm On the basis of the desired capacity equilibrium interval size, layer fourth switches will be allocated to the application server algorithm has many kinds, a detection loop simple nearest connection, closed-loop detection loop delay or detection server itself. In all the forecasts, closed loop feedback to provide the most accurate test of existing server traffic. 3) table capacity It should be noted that the fourth layer switch, switch to differentiate and store a large amount of sending items ability. Switches, especially in the core of an enterprise network. The number of second / three layer switch tendency and network devices transmit table is proportional to the. Fourth - layer switch, this number must be multiplied by the number of the use of network in different application protocol and session. Hence the number of sending the size of the table with the endpoint device and application types of growth and rapid growth. The fourth layer switch designers need design the product when considering the table in this growth. The big table capacity is crucial for manufacturing support line-speed transmitting fourth layer flow in high performance switches. 4) redundancy The fourth layer switch internal support redundant topology function. In the network card to connect with double link fault tolerance, it is possible to build from one server to the network card, fully redundant system link Cisco Catalyst 3750 and the server.