How to determine the number of member interfaces in an Eth-Trunk

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To ensure normal forwarding of burst traffic on an Eth-Trunk, the total bandwidth of the Eth-Trunk must be higher than the bandwidth of an interface that forwards normal traffic. To ensure that member interfaces of an Eth-Trunk evenly load balance traffic, you can use two, four, or eight member interfaces.

Other related questions:
How to determine active interfaces among member interfaces of an Eth-Trunk in LACP mode
When the status of member interfaces of an Eth-Trunk is different, the switch determines active interfaces according to interface priorities. Check LACP priorities of member interfaces on the Actor. A smaller LACP priority indicates a higher priority of the member interface. By default, LACP priorities of member interfaces are 32768. If member interfaces have the same LACP priority, check interface numbers of member interface. A smaller interface number indicates a higher priority of the member interface.

Setting the number of Eth-Trunk member interfaces on CE switches
Except that each Eth-Trunk on the CE5810EI supports a maximum of eight member interfaces, the maximum number of member interfaces on other switch models is configured using commands. For the CE12800 and CE6870EI: Run the assign forward eth-trunk mode { 256 | 512 | 1024 } command in the system view to set the number of Eth-Trunk member interfaces supported by the switch. By default, a maximum of 512 interfaces can be added to an Eth-Trunk on the switch. When 256 is specified, the switch allows a maximum of 256 LAGs and each LAG supports a maximum of 64 member interfaces. When 512 is specified, the switch allows a maximum of 512 LAGs and each LAG supports a maximum of 32 member interfaces. When 1024 is specified, the switch allows a maximum of 1024 LAGs and each LAG supports a maximum of 16 member interfaces. For CE8800&7800&6800&5800 series switches: Run the assign forward eth-trunk mode { 64 | 128 | 256 | 512 | 1024 } command in the system view to set the number of Eth-Trunk member interfaces supported by the switch. By default, a maximum of 128 interfaces can be added to an Eth-Trunk on the switch. When 64 is specified, the switch allows a maximum of 64 LAGs and each LAG supports a maximum of 32 member interfaces. When 128 is specified, the switch allows a maximum of 128 LAGs and each LAG supports a maximum of 16 member interfaces. When 256 is specified, the switch allows a maximum of 256 LAGs and each LAG supports a maximum of 8 member interfaces. When 512 is specified, the switch allows a maximum of 512 LAGs and each LAG supports a maximum of 4 member interfaces. When 1024 is specified, the switch allows a maximum of 1024 LAGs and each LAG supports a maximum of 2 member interfaces. Description: After the assign forward eth-trunk mode command is used to change the number of Eth-Trunk member interfaces supported by the switch, restart the switch to make the configuration take effect.

What is the maximum number of Eth-Trunks supported on S series switches
Hi, I cannot answer this question. For details about product specifications, please dial 4008229999 to consult Huawei technical support.

Number allocation of Eth-Trunk member interfaces on stacked S series switches
After you configure an Eth-Trunk on stacked S series switches (except the S1700), the member interface number remain unchanged even if you split the stack and stack the switches again.

How Do I Add Member Interfaces to an Eth-Trunk?
Before adding a new member interface, ensure that the type of the new member interface is the same as that of other member interfaces and there is no configuration on the new member interface. Run the shutdown command in the interface view to configure the new member interface in Down state. If the new member interface that joins the Eth-Trunk is not configured to be Down, a temporary loop may occur. As a result, services are affected. Run either of the following commands to add the new member interface to the Eth-Trunk. Run the eth-trunk trunk-id command in the interface view. Run the trunkport interface-type { interface-number1 [ to interface-number2 ] } &<1-8> command in the Eth-Trunk interface view. After member interfaces at both ends join the Eth-Trunk, run the undo shutdown command in the interface view to enable the new member interfaces.

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