Misunderstandings about port aggregation or port Aggregation

Some people often ask me whether port aggregation refers to link aggregation or VLAN trunking? Why did the teacher tell them all about this name? Is it wrong with the teacher or in the book.

After studying the Internet for so long, I have been using these two words in practice. In fact, this is not the same thing.

I checked the definition on Baidu:

Link AggregationIs to combine two or more data channels into a single channel, the channel appears in a single higher bandwidth Logical Link. Link aggregation is generally used to connect one or more devices with high bandwidth requirements, such as servers or Server clusters connected to backbone networks.
Port aggregation is also calledEthernet ChannelEthernet channel). It is mainly used for connection between vswitches. When there are multiple redundant links between two switches, STP will close several of them and keep only one of them. This will avoid the generation of L2 loops. However, the advantage of path redundancy is lost, because STP link switching will be slow, around 50 s. If an Ethernet channel is used, the switch combines a group of physical ports as a logical channel, that is, a channel-group. In this way, the switch considers the Logical channel as a port.
 

TRUNK indicates port aggregation.By Configuring software settings, you can combine two or more physical ports into one logical path to increase the bandwidth between the vswitch and the network node, merge the bandwidth of these ports to provide a high bandwidth that is exclusive to the independent ports several times. Trunk is a encapsulation technology. It is a point-to-point link. both ends of the link can be a switch, a switch, a router, or a host, a switch, or a router. Based on the port aggregation Trunk) function, allows the switch and the switch, the switch and the router, the host and the switch or the router to be concurrently transmitted through two or more ports to provide higher bandwidth and higher throughput, the entire network capability is greatly provided.

I think this Baidu result is wrong!

 

Some VLAN ports are also called TRUNKBut most of them are called TRUNKING, such as CISCO. The so-called TRUNKING is used to connect different switchesEnsure that members of the same VLAN established across multiple switches can communicate with each other. WhereThe port used for interconnection between vswitches is called the TRUNK port.
 

 

Is it true that Baidu's results are confusing. The description is also inaccurate ..

I have defined it myself, which may be inaccurate or complete. You can share it with me.

Link aggregation or port aggregation: Aggregates multiple physical links into one logical link. The bandwidth of this logical link is equivalent to the bandwidth of the physical link, these physical links act as members of this logical channel. Only this logical channel is configured during configuration. These physical ports are working at the same time. If a single port is disconnected, the call will not be affected, but the bandwidth is reduced.

VLAN port aggregation supports multiple VLANs in a physical link, which is equivalent to multiple virtual physical links. VLAN IDs are used to distinguish and interconnect VLAN IDs.
If a single link has one VLAN and 10 VLANs are allocated on the switch, 10 lines need to be connected for Cascade, and the port efficiency is too low. When a switch supports TRUNKING, It's easy. You only need to have a cascade line between the two switches and set the corresponding port to Trunk, this line can carry all VLAN information on the switch. In this way, even if the switch has hundreds of individual VLANs, only one port is used.

 
Link aggregation or port aggregation technology: it is a link problem. It solves the problem that multiple physical links form a logical link, increasing bandwidth and forming a redundant backup. This logical link is a link for us. It can be a trunk port or an access port.

Vlan port aggregation: It generally refers to the synthesis of multiple VLAN channels into one channel. Sharing a link can be a physical link, but also a logical link aggregation or port aggregation port ), as mentioned above, this port is a relay port. This port must be of the TRUNK type.

Vlan port aggregation solves the problem of L2 switches interacting with routers.

If you do not need to use vlan port aggregation, you can only use the following figure: this figure is only configured in the experiment and is basically useless in actual use.

 

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Vlan port aggregation is used as a single-arm route. For example, this solution is the most commonly used method. It is suitable for users who only have one vro and several L2 switches and want to divide VLANs.

 

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The three-layer switch is equivalent to the router routing function and the synthesis result of the multi-interface VLAN Technology of the Two-layer switch, such:

 

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Therefore, we recommend that you use aggregation of physical links, which can be called link ports) aggregation or link ports) aggregation.

VLAN relay aggregation is called vlan aggregation, VLAN aggregation, or trunk!

This article from the "Road to pick up the left-Xiao Xia Tang flying" blog, please be sure to keep this source http://xiaoxia.blog.51cto.com/23357/539485