Single Port Attached State Rules

By default, a LAG must contain two or more actor and partner port pairs for the LAG to be initiated by this device. A feature exists to allow the creation of a single port LAG that is disabled by default. If single port LAG is enabled, a single port LAG can be created on this device. If single port LAG is disabled, a single port LAG will not be initiated by this device. If a peer device is able to form a single port LAG and advertises its willingness to do so, a single port LAG can form.

There are three conditions under which a single port LAG can exist and the LAG member can be moved to the attached state:

• The single port LAG feature is enabled.

  or,

• The single port LAG feature is disabled, but the peer device is able and willing to form a single port LAG.

  or,

• An already existing LAG configuration persists through a device or module reset. If upon reset there is only a single port active for an already existing LAG, that single port will move to the attached state regardless of the single port LAG setting.