This time we briefly introduce the configuration of LACP，Basic skills of CCIE necessary for network engineers. In LACP, the establishment of Eth-Trunk and the joining of member interfaces are through auto-negotiation.
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The basic configuration of Eth-Trunk is as follows:
Add member interfaces to the aggregation group in the Eth-Trunk interface view
[SW2]interface Eth-Trunk 12 //Enter Eth-Trunk interface view
[SW2-Eth-Trunk12] trunkport Ethernet 0/0/21 to 0/0/22 // Divide interfaces into groups
[SW2-Eth-Trunk12]mode lacp-static //Set lacp mode
[SW2-Eth-Trunk12] load-balance src-dst-mac //Set load sharing mode
[SW2-Eth-Trunk12]least active-linknumber 1 //Configure the lower threshold of the number of link aggregation active interfaces, the default is 1
[SW2-Eth-Trunk12]max active-linknumber 2 //Configure the lower threshold of the number of link aggregation active interfaces, the default is 1
[SW2-Eth-Trunk12]lacp preempt enable // enable preemption function
Add member interfaces to the aggregation group in member interface view
[SW2]interface Ethernet 0/0/21
[SW2-Ethernet0/0/21]eth-trunk 12 //Add member interface to the group
[SW2-Ethernet0/0/21]lacp priority 32768 // Set the lacp priority value, the default is 32768
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After adding member interfaces to the Eth-Trunk, you need to pay attention to the following issues:
An Ethernet interface can only be added to one Eth-Trunk interface. If you need to add another Eth-Trunk interface, you must first exit the original Eth-Trunk interface.
When a member interface is added to an Eth-Trunk, the MAC address or ARP address is learned according to the Eth-Trunk instead of the member interface.
When deleting an aggregation group, you must first delete the member interfaces in the aggregation group.
This is an important point you should master to tek CCNA/CCNP/ CCIE exams.
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