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Configuring Aggregated Ethernet LACP

For aggregated Ethernet interfaces, you can configure the Link Aggregation Control Protocol (LACP). LACP is one method of bundling several physical interfaces to form one logical interface. You can configure both VLAN-tagged and untagged aggregated Ethernet with or without LACP enabled.

LACP exchanges are made between actors and partners. An actor is the local interface in an LACP exchange. A partner is the remote interface in an LACP exchange.

LACP is defined in IEEE 802.3ad, Aggregation of Multiple Link Segments.

LACP was designed to achieve the following:

Automatic addition and deletion of individual links to the aggregate bundle without user intervention
Link monitoring to check whether both ends of the bundle are connected to the correct group

The JUNOS implementation of LACP provides link monitoring but not automatic addition and deletion of links.

The LACP mode can be active or passive. If the actor and partner are both in passive mode, they do not exchange LACP packets, which results in the aggregated Ethernet links not coming up. If either the actor or partner is active, they do exchange LACP packets. By default, LACP is in passive mode on aggregated Ethernet interfaces. To initiate transmission of LACP packets and response to LACP packets, you must enable LACP active mode.

To enable LACP active mode, include the lacp statement at the [edit interfaces interface-name aggregated-ether-options] hierarchy level, and specify the active option:



[edit interfaces interface-name aggregated-ether-options]

lacp {
active;
}

To restore the default behavior, include the lacp statement at the [edit interfaces interface-name aggregated-ether-options] hierarchy level, and specify the passive option:



[edit interfaces interface-name aggregated-ether-options]

lacp {
passive;
}

For more information, see the following sections:

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