lag

Syntax

lag <ID>
no lag <ID>

Description

Adds an interface to a specified LAG interface ID.

The no form of this command removes an interface from a specified LAG interface ID. The member loses all of its configuration when removed from the LAG. The member also reaches the default state with an administrative shutdown.

Command context

config-if

Parameters

<ID>

Specifies a LAG interface ID. Range: 1 to 256.

Authority

Administrators

Usage

  • All members of the LAG must have the same speed. If a member comes up late with a different speed, it will not participate in the LAG/LACP. The hardware restriction is applied before adding an interface to LAG. The member belongs to the card type that has the same maximum speed as the reference port card type.

  • To move an interface from LagA to LagB, first remove the interface from LagA and then add it to LagB. When a member is attached to a LAG, the non-default configurations on the member are removed silently.

  • After removing a physical interface from a LAG, the interface associated with the LAG becomes L3 ports with default L3 configurations and administrative down. For example, suppose interface 1/1/1 was part of LAG 3 and you had administratively enabled the interface. If you later remove interface 1/1/1 from LAG 3, the administrative status automatically changes to down. If you want to use the interface again, you must administratively enable it again.

Examples

Adding an interface to a Link Aggregation Group (LAG) represented by an ID of 100:

switch(config)# interface 1/1/1
switch(config-if)# lag 100

Deleting an interface from a Link Aggregation Group (LAG) represented by an ID of 100:

switch(config)# interface 1/1/1
switch(config-if)# no lag 100