Adding a multilink or LACP trunk

Perform this procedure to add a multilink or LACP trunk.

About this task

Important

Ensure that all ports that belong to the same MLT/LACP group use the same port speed, for example, 1 Gbit/s, even if autonegotiation is used. This requirement is not enforced by the software.

When you add a VLAN to a dynamic MLT, only the active ports of the MLT are added as port members of the VLAN. Ports configured with the same aggregation key, but not active, are not added to the VLAN. If these inactive ports become active later, the system does not automatically add them to the VLAN port member list.

You must add all inactive ports to the VLAN. If you do not add the inactive ports to the VLAN, when they become active later, hashing can result in choosing a newly active port for traffic forwarding. Because the port is not a port member of the VLAN, traffic will be dropped. When you add the VLAN to the MLT, also add the inactive aggregation ports to the VLAN. You may have to disable LACP on the inactive ports before you can add them to the VLAN. Because the ports are inactive, disabling LACP does not cause a traffic interruption.

Similarly when you remove a VLAN from a dynamic MLT, all active ports of the MLT are removed from the VLAN port member list but the inactive members are not removed. You must remove the inactive aggregation members from the VLAN.

If you later configure a port for the same aggregation, you must add this port to all VLANs that are members of the MLT.

Procedure

In the navigation tree, expand the following folders: Configuration > VLAN.
Click MLT/LACP.
Click the MultiLink/LACP Trunks tab.
Click Insert.
In the Id box, type the ID number of the MLT.
In the PortType section, select access or trunk.
In the Name box, type a name for the MLT, or accept the default.
In the PortMembers box, click the (...) button.
In the Port Editor: PortMembers dialog box, select the desired ports.
Click Ok
In the VlanIdList box, click the (...) button,
In the VlanIdList dialog box, select the desired VLANs.
Click Ok.
In the MltType section, select the MLT type.
In the Aggregatable box, select enable or disable.
In the PrivateVlanTypebox, select trunk, isolated, or promiscuous.
Click Insert.

The MLT is added to the MultiLink/LACP Trunks tab in the MLT_LACP box.

MultiLink/LACP Trunks Field Descriptions

Use the data in the following table to use the MultiLink/LACP Trunks tab


Name	Description
Id	Specifies a unique value for this MLT.
PortType	Specifies the value to access or trunk port. If the aggregatable field is set to enable, this field is read-only. The default value is access.
Name	Configures the name given to the MLT.
PortMembers	Assigns ports to the MLT. All ports in an MLT must have the same settings for speed and duplex, but can have different media types. All untagged ports must belong to the same STG. Up to eight same-type ports can belong to a single MLT. If the aggregatable field is set to enable, this field becomes read-only. Important: Ensure that all ports that belong to the same MLT/LACP group use the same port speed, for example, 1 Gbps, even if autonegotiation is enabled.
VlanIdList	Indicates to which ports the VLANs belong. If the aggregation field is set to enable, this field is read-only.
MltType	Specifies the type of MLT normalMLT (default) istMLT splitMLT
RunningType	Specifies the MLT running type.
IfIndex	Specifies the interface of the trunk.
ClearLinkAggregate	Clears the link aggregate, disabling and reenabling the trunk.
DesignatedPort	Specifies the designated port of this trunk.
Aggregatable	Enables or disables link aggregation. The default value is disable.
AggOperState	Specifies the aggregation state of the trunk.
AggTimeOfLastOperChange	Specifies the time value since the interface entered its current operational state.
PeerPortMembersList	Specifies the peer ports connected to the local ports of this trunk.
EntryOwner	Defines the owner of the MLT.
DatapathProgrammingState	Defines the datapath programming state of the MLT.
PrivateVlanType	Specifies the type of private VLAN for the MLT.
FlexUniEnable	Specifies whether the Flex UNI is enabled or disabled on the port. The default value is disable.