Shulou(Shulou.com)06/02 Report--

one。 Technical principle

1) Port aggregation (also known as link aggregation), which physically connects multiple ports on the switch and logically bundles them together to form a port with large broadband, which can achieve load sharing and provide redundant links.

2) Port aggregation uses the EtherChannel feature to provide redundant, high-speed connections from switch to switch. Multiple FastEthernet or GigabitEthernet physical links between two devices are bundled together to form a logical inter-device link to enhance bandwidth and provide redundancy.

3) the speed from the two switches to the computer is 100m. Although there are two 100m physical channels connected between SW1 and SW2, only 100m is available because of spanning tree. The link between the switches is easy to form a bottleneck. Using port aggregation technology, two 100m links are aggregated into a 200m logical link. When one link fails, the other link will continue to work.

Port aggregation configuration commands in global configuration mode:

Interface range interface_name1 to interface_name2

Switchport mode trunk

Channel-group 1 mode on joins link group 1 and turns it on

Switch#show etherchannel summary: displays information about the trunk port group

Parameters:

Interface_name1: aggregation start port

Interface_name2: aggregation end port

Trunk: indicates that the port can forward all Vlan packets, and the trunk mode interface can transmit multiple VLAN messages at the same time.

Trunk mode is often used between two SWITCH and ROUTER and SWITCH and SWITCH.

Channel-group: combines two or more physical ports together to form a logical link, while also forming a logical port port-channel

Switchport mode access: directly connects to the host. The interfaces in the VLAN are all access.

2 Experimental environment (following the previous experiment, an extra network cable was added between the two switches)

Configure sw1,sw2,f1/3-4 port for trunk and port aggregation

Three experimental tests

First use the PC5 normal ping PC6 and then shut down the SW1 F1 port 3 (shutdown command)

Shut down the SW1 f1max 3 port

At this time, PC5 and PC6 communicate normally.

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