the Precautions of configuring Link aggregation

Feature	Precautions
Link aggregation	Before you configure the operation mode of an Eth-Trunk interface, check whether the Eth-Trunk interface contains member interfaces. If the Eth-Trunk contains member interfaces, you cannot change the operation mode of the Eth-Trunk interface. To delete member interfaces from the Eth-Trunk interface, run the undo eth-trunk command in the member interface view or run the undo trunkport interface-type interface-number command in the Eth-Trunk interface view. If one of the specified member interfaces cannot be added to the Eth-Trunk, interfaces following this interface cannot be added to the Eth-Trunk. The maximum number of active interfaces must be larger than or equal to the minimum number of active interfaces. The maximum number of active interfaces on the local switch can be different from that on the remote switch. If the two values are different, the smaller one is used. To ensure normal running of an Eth-Trunk interface, enable or disable LACP preemption on both ends of the Eth-Trunk interface. The LACP packet statistics cannot be restored after you clear them. Debugging affects the performance of the system. Therefore, run the undo debugging all command to disable debugging immediately after the debugging is complete. The S3700HI does not support load balancing of unknown unicast packets on an Eth-Trunk. After you run the lacp timeout command, the local end informs the peer end of the timeout interval through LACP packets. If the fast keyword is used, the interval for sending LACP packets is 1 second. If the slow keyword is used, the interval for sending LACP packets is 30 seconds. The timeout interval for receiving LACP packets is three times the interval for sending LACP packets. In other words, when the fast keyword is used, the timeout interval for receiving LACP packets is 3 seconds. When the slow keyword is used, the timeout interval for receiving LACP packets is 90 seconds. You can select different keywords on the two ends. However, it is recommended that you select the same keyword on both ends to facilitate the maintenance. The maximum number of interfaces that determine bandwidth of the Eth-Trunk interface on the local switch can be different from that on the remote switch. If the two values are different, the smaller one is used. The minimum number of active interfaces on the local switch can be different from that on the remote switch. If the two values are different, the larger one is used. A CSS is a logical device formed by connecting two switches with stack cables. Interfaces in a CSS are named in the format of chassis ID/slot ID/subcard number/interface number. For example, the number 2 in GE 2/1/0/1 is the chassis number. An inter-chassis Eth-Trunk interface contains member interfaces on both CSS member switches. When a switch or a physical member interface fails, traffic can be transmitted between chassis through stack cables. This ensures reliable transmission and implements device backup. Before configuring an Eth-Trunk interface to preferentially forward local traffic, ensure that the outbound bandwidth of Eth-Trunk member interfaces is sufficient for forwarding local traffic. If the outbound interface bandwidth is insufficient, some packets are dropped.

Feature

Precautions

Link aggregation

Before you configure the operation mode of an Eth-Trunk interface, check whether the Eth-Trunk interface contains member interfaces. If the Eth-Trunk contains member interfaces, you cannot change the operation mode of the Eth-Trunk interface. To delete member interfaces from the Eth-Trunk interface, run the undo eth-trunk command in the member interface view or run the undo trunkport interface-type interface-number command in the Eth-Trunk interface view.

If one of the specified member interfaces cannot be added to the Eth-Trunk, interfaces following this interface cannot be added to the Eth-Trunk.

The maximum number of active interfaces must be larger than or equal to the minimum number of active interfaces.
The maximum number of active interfaces on the local switch can be different from that on the remote switch. If the two values are different, the smaller one is used.

To ensure normal running of an Eth-Trunk interface, enable or disable LACP preemption on both ends of the Eth-Trunk interface.

The LACP packet statistics cannot be restored after you clear them.

Debugging affects the performance of the system. Therefore, run the undo debugging all command to disable debugging immediately after the debugging is complete.

The S3700HI does not support load balancing of unknown unicast packets on an Eth-Trunk.

After you run the lacp timeout command, the local end informs the peer end of the timeout interval through LACP packets. If the fast keyword is used, the interval for sending LACP packets is 1 second. If the slow keyword is used, the interval for sending LACP packets is 30 seconds.
The timeout interval for receiving LACP packets is three times the interval for sending LACP packets. In other words, when the fast keyword is used, the timeout interval for receiving LACP packets is 3 seconds. When the slow keyword is used, the timeout interval for receiving LACP packets is 90 seconds.
You can select different keywords on the two ends. However, it is recommended that you select the same keyword on both ends to facilitate the maintenance.

The maximum number of interfaces that determine bandwidth of the Eth-Trunk interface on the local switch can be different from that on the remote switch. If the two values are different, the smaller one is used.

The minimum number of active interfaces on the local switch can be different from that on the remote switch. If the two values are different, the larger one is used.

A CSS is a logical device formed by connecting two switches with stack cables. Interfaces in a CSS are named in the format of chassis ID/slot ID/subcard number/interface number. For example, the number 2 in GE 2/1/0/1 is the chassis number.
An inter-chassis Eth-Trunk interface contains member interfaces on both CSS member switches. When a switch or a physical member interface fails, traffic can be transmitted between chassis through stack cables. This ensures reliable transmission and implements device backup.

Before configuring an Eth-Trunk interface to preferentially forward local traffic, ensure that the outbound bandwidth of Eth-Trunk member interfaces is sufficient for forwarding local traffic. If the outbound interface bandwidth is insufficient, some packets are dropped.

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