Elaborate on the core switch TRUNK _ V Fourth Space.

TRUNK in the end what is it? .TRUNK function in the end with which applications can bring us the advantage? .There are products in specific how to configure the switch TRUNK, let's look at these aspects of knowledge. .Performance parameters of the switch in the second floor, often referred to an important indicator: TRUNK, many of the story switches to introduce its performance, will be referred to support TRUNK capabilities, which can provide more interconnection between switches .good transmission performance. .TRUNK it in the end what is it? .TRUNK function in the end with which applications can bring us the advantage? .There are products in specific how to configure the switch TRUNK. .Let's look at these aspects of knowledge. .First, what is the TRUNK? .TRUNK port aggregation is the meaning, that is, by configuring the software settings, two or more physical ports together into a logical path in order to increase the switch and the network bandwidth between nodes, will belong to the bandwidth of these ports .merger, to the port several times to provide a separate port in exclusive high-bandwidth. .Trunk is a packaging technology, it is a point to point link, both ends of the link to all switches, it can be switches and routers, and switches can also be a host or router. .Port-based aggregation (Trunk) feature allows the switch and switches, switches and routers, between the host and the switch or router ports through the parallel connection of two or more simultaneous transmission in order to provide higher bandwidth, more throughput, to provide the substantial .network capacity. .Under normal circumstances, when not in use TRUNK, we all know, Fast Ethernet, twisted pair transmission medium characteristics of this decision in two ordinary 10/100 switch interconnect bandwidth is only 100M, if it is used .full-duplex mode, then the maximum transmission bandwidth maximum 200M, thus forming a network backbone and server bottlenecks. .To achieve higher data transfer rates, you need to replace the transmission medium, the use of Gigabit fiber or upgrade a Gigabit Ethernet, although such a bandwidth can be achieved in gigabit, but the cost is very expensive (they may even need to switch .replace a piece), but this is not suitable for low-cost, small and medium enterprises and schools. .If you use TRUNK technology, by tying together the four ports to achieve 800M bandwidth, this would better solve the contradiction between cost and performance. .Second, TRUNK specific application TRUNK (port aggregation) is between the switch and network equipment more economical way to increase bandwidth, such as servers, routers, workstations, or other switches. .This method to increase bandwidth between nodes when a single switch and the connection can not meet the load is more effective. .TRUNK main function is to multiple physical ports (typically 2-8) bound to a logical channel, it works like a channel the same. .Bundle multiple physical links, not only enhance the entire network bandwidth, and data can be bound simultaneously by multiple physical link transmission, with a link redundant role in the network failure or other .Disconnect the reasons for which one or more links, the rest of the link can work. .However, VLAN data transmission, all manufacturers use different technologies, such as: Cisco's product is the use of its VLANTRUNK technology, most of the other vendors to support 802.1q TAG agreement marked the first, thus generating a little giant frames, require the same port protocol .to identify, little giant frames as Ethernet frames larger than the standard 1518-byte limit, ordinary network card is not recognized, need to switch off the TAG. .TRUNK features more suitable for specific applications in the following areas: 1, TRUNK capabilities associated with the server, the server offers exclusive high-bandwidth. .2, TRUNK capabilities for switches between the cascade, the number of ports to the expense of data exchange between a switch to provide bundled high-bandwidth, improve network speed, breaking the network bottleneck, significantly improve the network performance. .3, Trunk can provide load balancing and fault tolerance. .Trunk balance the real-time interface to all switch ports and server traffic, once a port failure, it will automatically Trunk group failed to withdraw from the port, and then redistribute the flow of each Trunk Port in order to achieve system fault tolerance. .<wbr> Third, how to set the TRUNK? .TRUNK need to specify a set as a trunk port, such as the 2 / 24, such as a port set to Trunk mode, the command is as follows: set trunk mod / port [on | off | desirable | auto | nonegotiate] [vlan_range] [isl | .dot1q dot10 | lane | negotiate]. .This command can be divided into the following four parts: mod / port: Specifies the user that you want to run Trunk port; Trunk mode of operation, respectively: on | off | desirable | auto | nonegotiate. .To the Fast Ethernet and Gigabit Ethernet automatically recognizes Trunk, you must ensure that in the same VTP domain. .On or Nonegotiate can also use the model to force a port from the Trunk, regardless of whether in the same VTP domain. .Carrying the VLAN range. .By default is 1 ~ 1005, can be modified, but there must TRUNK agreement. .TRUNK used, the adjacent port on the agreement to be consistent. .Also in the center of the switch and the following need to be connected to the switch port set to TRUNK, so the following VLAN on multiple switches through a communication link and a central switch. .Fourth, when configured TRUNK TRUNK in a note, the data is always from a particular source to the destination point, a single link is designed to handle broadcast packets or do not know the destination of the package. .TRUNK in the configuration, you must follow these rules: 1: The right choice TRUNK port number must be 2,4 or 8. .2: You must use the same set of ports on the switch port into several groups, TRUNK all ports must be from the same set of <wbr> <wbr> <wbr> 3: use of continuous port; TRUNK port on the .must be continuous, as you can use ports 4,5,6 and 7 combined into a port aggregation. .<wbr> <wbr> <wbr> <wbr> 4: In a group of port only produce a TRUNK;.