Problems with switch trunk configuration

What exactly is trunk? What are the advantages of using the trunk function to us in the application? And how to switch trunk configuration in a specific switch product, let's take a look at these areas of knowledge. In the performance parameters of the two-tier switch.

often mentions an important metric: TRUNK, many of the two-tier switch products, when describing their performance, refer to the ability to support TRUNK capabilities, which can provide better transport performance between interconnected switches. What the hell is a trunk? What are the application advantages of the

using the trunk feature? There is also how to switch trunk configuration in specific switch products. Let's take a look at these aspects of knowledge.

One, what is trunk? The

Trunk is the meaning of a port convergence by configuring software settings to combine 2 or more physical ports into a logical path that increases bandwidth between the switch and network nodes, merging the bandwidth that belongs to these ports. The

provides the port with a high bandwidth that is several times the exclusive port. Trunk is a packaging technology that is a point-to-point link where both ends of the link can be switches, switches and routers, and can be hosts and switches or routers. Based on port aggregation (Trunk) functionality.

allows switches and switches, switches and routers, hosts and switches, and routers to connect concurrently with two or more ports for simultaneous transmission to provide higher bandwidth, greater throughput, and a significant overall network capability. Under normal circumstances.

In the absence of trunk, it is known that the transmission media characteristics of the UTP of Gigabit Ethernet determine that the bandwidth of the two-connected common 10/100 switches is only 100M, and that the maximum bandwidth of the transmission can be up to 200M if the Full-duplex mode is used.

This creates a network backbone and server bottleneck. To achieve a higher data transfer rate, you need to replace the transport media, use gigabit fiber or upgrade to Gigabit Ethernet, which can achieve gigabit bandwidth, but the cost is very expensive (maybe even the switch needs to be replaced). The

is not suitable for low-cost SME and school use. If using trunk technology, four ports are bundled together to achieve 800M bandwidth, which can better solve the contradiction between cost and performance. The specific application of

II, TRUNK

TRUNK (Port aggregation) is a cost-effective way to increase bandwidth between switches and network devices, such as servers, routers, workstations, or other switches. The way to increase bandwidth is to connect between a single switch and a node withoutIt is more effective to meet the load. The primary function of the

TRUNK is to bind multiple physical ports (typically 2-8) to a logical channel, making them work like a channel. When multiple physical links are bundled together, not only does it enhance the bandwidth of the entire network, but the data can also be transmitted through multiple physical links bound by the

, with link redundancy, and the remaining links work when a network failure or other reason disconnects one or more links. However, in VLAN data transfer, various manufacturers use different technologies, such as: Cisco's products are made.

uses its VLAN TRUNK technology, Other manufacturers of products mostly support the 802.1Q protocol hit the tag head, which generated a small giant frame, the need for the same port protocol to identify, small giant frame due to the size of the standard Ethernet frame 1518-byte limit, ordinary network card can not recognize, need to have switch off tag. Considerations for

Switch trunk configuration

in a trunk, the data is always from a specific source point to the destination point, and a single link is designed to handle the broadcast packet or the packets that are not known to the destination. When you configure trunk, you must follow the following rules:

1: The number of ports that trunk is properly selected must be 2,4 or 8.

2: You must use the ports in the same group, the ports on the switch are divided into groups, and all ports of the trunk must come from the same set of

3: Use contiguous ports; trunk ports must be contiguous, such as you can use port 4,5,6 and 7 groups to synthesize a port aggregation.

4: Only one trunk is generated on a set of ports.