Configuring Eth-Trunk Interface Parameters

Layer 2 and Layer 3 Eth-Trunk interfaces need to be configured with different parameters. Configure the parameters as required.

Procedure

Configure parameters for a Layer 2 Eth-Trunk interface.

Run system-view
The system view is displayed.
Run interface eth-trunk trunk-id
The Eth-Trunk interface view is displayed.
Run portswitch
The Eth-Trunk interface is switched to a Layer 2 interface.

Perform one or more operations shown in Table 1 as needed.

**Table 1** Configuring parameters for a Layer 2 Eth-Trunk interface
Parameter for a Layer 2 Eth-Trunk Interface	Operation
Maximum number of Up member links that determine the Eth-Trunk link bandwidth	Run the max bandwidth-affected-linknumber link-number command.
Maximum number of Up member links	Run the max active-linknumber link-number command. NOTE: To prevent Eth-Trunk link from flapping, you are advised to configure the same upper limit for the two ends of an Eth-Trunk link. If only one end of the Eth-Trunk link is configured, flapping may occur after all the selected member links switchover is triggered.
Minimum number of Up member links	Run the least active-linknumber link-number command.
Minimum bandwidth configured for the member links that are Up on an Eth-Trunk interface	Run the least active-bandwidth bandwidth command. NOTE: Ensure that the least active-linknumber link-number command has not been run when you run the least active-bandwidth bandwidth command because the two commands are mutually exclusive. The minimum bandwidth configured for both ends of an Eth-Trunk must be the same to prevent the Eth-Trunk interface from flapping. After the minimum bandwidth is configured for the member links that are Up on an Eth-Trunk interface, do not run the max active-linknumber link-number command to configure the maximum number of active links. That is because the Eth-Trunk interface will go Down if the total bandwidth of the maximum number of active links is less than the minimum bandwidth.
Load balancing mode	Run the { load-balance { src-dst-mac \| src-dst-ip \| packet-all \| symmetric-hash [ complement ] } command.
Mode in which active member interfaces are selected	Run the lacp selected { priority \| speed } command.
LACP preemption delay	Run the lacp preempt enable command to enable LACP preemption. Run the lacp preempt delay delay-time command to configure an LACP preemption delay. NOTE: To ensure that an Eth-Trunk works properly, you are advised to enable or disable LACP preemption on both ends. The two ends of an Eth-Trunk link can be configured with different LACP preemption delays. If the two ends are configured with different preemption delays, Eth-Trunk uses the greater delay-time value as the preemption delay.
Timeout period for an Eth-Trunk interface to receive LACP packets	Run the lacp timeout { fast [ user-defined user-defined ] \| slow } command. NOTE: The two ends of an Eth-Trunk link can be configured with different timeout periods. To facilitate maintenance, you are advised to configure the same timeout period for both ends.
CollectorMaxDelay field value in LACPDUs to be received by an Eth-Trunk interface	Run the lacp collector delay delay-dtime command to configure the value of the CollectorMaxDelay field in an LACPDU.
An LACP system ID for an Eth-Trunk interface	Run the lacp system-id mac-address command.
LACP negotiation delay for an Eth-Trunk interface	Run the lacp negotiate delaydelay-value command to configure the LACP negotiation delay for an Eth-Trunk interface.
Period that an Eth-Trunk interface waits before changing its state to Down	Run the link-state down-delay-time delay-value command.

Run commit
The configuration is committed.

Configure parameters for a Layer 3 Eth-Trunk interface.

Run system-view
The system view is displayed.
Run interface eth-trunk trunk-id
The Eth-Trunk interface view is displayed.

Perform one or more operations shown in Table 2 as needed.

**Table 2** Configuring parameters for a Layer 3 Eth-Trunk interface
Parameter for a Layer 3 Eth-Trunk Interface	Operation
IP address of the Eth-Trunk interface	Run the ip address ip-address { mask \| mask-length } [ sub ] command.
MAC address of the Eth-Trunk interface	Run the mac-address mac-address command.
MTU of the Eth-Trunk interface	Run the mtu mtu command. NOTICE: The MTUs of two directly-connected interfaces must be the same. After using the mtu mtu command to change the MTU of an interface, change the MTU of the directly-connected interface on another device to ensure that the MTUs of the two ends are the same. Otherwise, services may be interrupted. If IPv6 runs on an Eth-Trunk interface, and the MTU set by using the mtu mtu command on the interface is smaller than 1280 bytes, IPv6 does not properly work on this interface. To prevent such a problem, set the MTU of the interface to a value greater than or equal to 1280 when IPv6 runs on the interface.
Maximum number of Up member links	Run the max active-linknumber link-number command. NOTE: To prevent Eth-Trunk link from flapping, you are advised to configure the same upper limit for the two ends of an Eth-Trunk link. If only one end of the Eth-Trunk link is configured, flapping may occur after all the selected member links switchover is triggered.
Minimum number of Up member links	Run the least active-linknumber link-number command. An Eth-Trunk interface is Up as long as one member interface is Up.
Minimum bandwidth configured for the member links that are Up on an Eth-Trunk interface	Run the least active-bandwidth bandwidth command. NOTE: Ensure that the least active-linknumber link-number command has not been run when you run the least active-bandwidth bandwidth command because the two commands are mutually exclusive. The minimum bandwidth configured for both ends of an Eth-Trunk must be the same to prevent the Eth-Trunk interface from flapping. After the minimum bandwidth is configured for the member links that are Up on an Eth-Trunk interface, do not run the max active-linknumber link-number command to configure the maximum number of active links. That is because the Eth-Trunk interface will go Down if the total bandwidth of the maximum number of active links is less than the minimum bandwidth.
Load balancing mode	Run the { load-balance { src-dst-mac \| src-dst-ip \| packet-all \| symmetric-hash [ complement ] } command.
Mode in which active member interfaces are selected	Run the lacp selected { priority \| speed } command. NOTE: To ensure that an Eth-Trunk works properly, you are advised to configure the Eth-Trunk interfaces on both ends to select active member interfaces in the same mode.
LACP preemption delay	Run the lacp preempt enable command to enable LACP preemption. Run the lacp preempt delay delay-time command to configure an LACP preemption delay. NOTE: To ensure that an Eth-Trunk works properly, you are advised to enable or disable LACP preemption on both ends. The two ends of an Eth-Trunk link can be configured with different LACP preemption delays. If the two ends are configured with different preemption delays, Eth-Trunk uses the greater delay-time value as the preemption delay.
Timeout period for an Eth-Trunk interface to receive LACP packets	Run the lacp timeout { fast [ user-defined user-defined ] \| slow } command. NOTE: The two ends of an Eth-Trunk link can be configured with different timeout periods. To facilitate maintenance, you are advised to configure the same timeout period for both ends.
CollectorMaxDelay field value in LACPDUs to be received by an Eth-Trunk interface	Run the lacp collector delay delay-dtime command to configure the value of the CollectorMaxDelay field in an LACPDU.
An LACP system ID for an Eth-Trunk interface	Run the lacp system-id mac-address command.
LACP negotiation delay for an Eth-Trunk interface	Run the lacp negotiate delaydelay-value command to configure the LACP negotiation delay for an Eth-Trunk interface.
Period that an Eth-Trunk interface waits before changing its state to Down	Run the link-state down-delay-time delay-value command.

Run commit
The configuration is committed.