Port aggregation - Introduction to TRUNK technology

Overview


With the continuous development and application of network technology, the speed of the network is getting faster and faster, and the application of the network is more and more complicated. Therefore, in many practical applications, the network speed becomes the bottleneck of various network applications. Increasing network speed through upgrades is an effective solution to the problem, such as from 10M Ethernet to 100M Ethernet to 1000M Ethernet or higher.


However, this method is expensive and requires more equipment. For enterprises and organizations with insufficient funds, how to use existing resources to improve network speed is also an urgent problem to be solved.


As the saying goes, everyone collects firewood high, and Trunk technology is to use multiple links together as a link to increase network speed and meet user needs. This is important in the application of small and medium-sized enterprise switches, and several links can be bundled to complete high-speed transmission tasks without additional investment. And you can also configure the transfer rate according to actual needs. Without the network upgrade, the rate can only be increased by an order of magnitude and cannot be flexibly configured as needed. This is of great value in flexible and efficient high-speed communication between switches and switches, between switches and servers.


Concepts and features


Trunk technology, also known as port aggregation (port Aggregate), link aggregation (multiple link aggregation). The essence is to bind multiple Ethernet ports together as a logical link.


As the user uses this logical link, it seems to use a separate physical link, but the bandwidth of this logical link has increased linearly (for example, if there are four 100M physical ports converged into one trunk, then this The logical link bandwidth is 800M). So we need do more cisco ccnp training.


Pay attention when configuring the trunk:


1. Before forming a trunk, you must make the ports in the group the same type (that is, the same transmission rate is required to be 10M, 100M, and both work in full duplex and the connected media should be the same).


2. The port members that become a trunk should be in the same spanning tree group. At this point, the spanning tree treats the trunk as a spanning tree port.


3. A port member of a trunk should belong to the same VLAN member.


The advantages of Trunk are:


1, can quickly and effectively linearly increase the bandwidth (when conditions permit, you can determine how fast the transmission rate needs to determine how many ports form a trunk according to the needs of the application)


2. The redundancy of the link can be provided. If one of the ports in the aggregation fails, the port can be modified. For example, when the port is the root port of the trunk, the port is disabled in the spanning tree and is in the remaining trunk port. Reselect a port as the root port to ensure the system is running properly. But in the user's opinion, the system has not changed.


3. Load balancing can be implemented on ports in a trunk group.

With the continuous development and application of network technology, the speed of the network is getting faster and faster, and the application of the network is more and more complicated. Therefore, in many practical applications, the network speed becomes the bottleneck of various network applications. Increasing network speed through upgrades is an effective solution to the problem, such as from 10M Ethernet to 100M Ethernet to 1000M Ethernet or higher.


However, this method is expensive and requires more equipment. For enterprises and organizations with insufficient funds, how to use existing resources to improve network speed is also an urgent problem to be solved.


As the saying goes, everyone collects firewood high, and Trunk technology is to use multiple links together as a link to increase network speed and meet user needs. This is important in the application of small and medium-sized enterprise switches, and several links can be bundled to complete high-speed transmission tasks without additional investment. And you can also configure the transfer rate according to actual needs. Without the network upgrade, the rate can only be increased by an order of magnitude and cannot be flexibly configured as needed. This is of great value in flexible and efficient high-speed communication between switches and switches, between switches and servers.



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