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Even Load Balance for Eth-Trunk

Latest reply: Jan 3, 2019 21:08:12 776 2 1 0 0

A popular way of load balancing is creating eth-trunk interfaces, but many times this is done without considering this little fact, when adding interfaces to the eth-trunk it is important to remember that if the number is the nth power of 2, the load balance will be more even. Here is a simple and effective way to check if the eth-trunk contains an nth power of 2 number of interfaces.

Checking Whether the Number of Member Interfaces is the nth Power of 2


<HUAWEI> display eth-trunk 1 verbose

Eth-Trunk1's state information is:


LAG ID: 1                   WorkingMode: LACP

Preempt Delay Time: 1       Hash arithmetic: According to SIP-XOR-DIP

System Priority: 32768      System ID: 0018-82d4-04c3

Least Active-linknumber: 1  Max Active-linknumber: 2

Operate status: up          Number Of Up Port In Trunk: 2


ActorPortName                     Status       PortType     PortPri PortNo PortKey PortState Weight

GigabitEthernet0/0/2           Selected   1GE          10          262      2609    10111100   1

GigabitEthernet0/0/3           Selected    1GE          10          263      2609    10111100   1

GigabitEthernet0/0/4             Unselect     1GE          32768    264      2609    10100000  1


Method for identifying the selected Eth-Trunk member interface:


In LACP mode (the value of WorkingMode is LACP), the value of Status of the interface is Selected.


In manual load balancing mode (the value of WorkingMode is NORMAL), the value of Status of the interface is Up.

  • x
  • convention:

terae7 Created Jan 15, 2019 15:00:04 (0) (0)
For sure we usually forget that point, and it is important to remember it in order to achieve the best load balance performance.
So, if we take that into account as well as establishing an optimal load profile balance in the EthTrunk, it can work pretty 
Created Jan 3, 2019 21:08:12

Is good to know that, in order to improve load balance in a Eth-Trunk, the number of member interfaces should be a Nth power of 2. Thanks for sharing!!
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  • x
  • convention:


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