Changing the LAG membership for an interface

Prerequisites

You must be in the global configuration context: switch(config)#

Procedure

Remove an interface from the LAG. Enter:
```
switch(config)# interface <PORT-NUM>
switch(config-if)# no lag <ID>
```
For example:
For 6200, 6300, and 6400 switch series:
```
switch(config)# interface 1/1/1
switch(config-if)# no lag 100
switch(config-if)# show running-config
Current configuration:
!
...
!
vlan 1
interface lag 100
    no shutdown
    vlan trunk native 1
    vlan trunk allowed all
interface 1/1/1
interface 1/1/2
    no shutdown
    lag 100
switch(config-if)#
```
For 8320, 8325, and 8400 switch series:
```
switch(config)# interface 1/1/1
switch(config-if)# no lag 100
switch(config-if)# show running-config
Current configuration:
!
...
!
vlan 1
interface lag 100
    no shutdown
    no routing
    vlan trunk native 1
    vlan trunk allowed all
interface 1/1/1
interface 1/1/2
    no shutdown
    lag 100
switch(config-if)#
```
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.

On 6200 Switch Series, after removing a physical interface from a LAG, the interface associated with the LAG becomes layer 2 ports with default layer 2 configurations and admin status enabled.

Create the LAG to which you want to add the interface:

switch(config-if)# interface lag 10

For example:

For 6200, 6300, and 6400 switch series:

switch(config-if)# interface lag 10
switch(config-lag-if)# no shutdown
switch(config-lag-if)# vlan trunk native 1

For 8320, 8325, and 8400 switch series:

switch(config-if)# interface lag 10
switch(config-lag-if)# no shutdown
switch(config-lag-if)# no routing
switch(config-lag-if)# vlan trunk native 1

Add the interface from Step 1 to the newly created LAG:

switch(config)# interface 1/1/1
switch(config-if)# lag 10

For example:

For 6200, 6300, and 6400 switch series:

switch(config)# interface 1/1/1
switch(config-if)# lag 10
switch(config-if)# show running-config
Current configuration:
!
...
!
vlan 1
interface lag 10
    no shutdown
    vlan trunk native 1
    vlan trunk allowed all
interface lag 100
    no shutdown
    vlan trunk native 1
    vlan trunk allowed all
interface 1/1/1
    lag 10
interface 1/1/2
    no shutdown
    lag 100

For 8320, 8325, and 8400 switch series:

switch(config)# interface 1/1/1
switch(config-if)# lag 10
switch(config-if)# show running-config
Current configuration:
!
...
!
vlan 1
interface lag 10
    no shutdown
    no routing
    vlan trunk native 1
    vlan trunk allowed all
interface lag 100
    no shutdown
    no routing
    vlan trunk native 1
    vlan trunk allowed all
interface 1/1/1
    lag 10
interface 1/1/2
    no shutdown
    lag 100

Notice that interface 1/1/1 in the previous example is still not active, even though it has been added to LAG 10. To change the administrative state of the member interface, enter the no shutdown command at the interface level.

For example:

For 6200, 6300, and 6400 switch series:

switch(config-if)# interface 1/1/1
switch(config-if)# no shutdown
switch(config-if)# show running-config
Current configuration:
!
...
!
vlan 1
interface lag 10
    no shutdown
    vlan trunk native 1
    vlan trunk allowed all
interface lag 100
    no shutdown
    vlan trunk native 1
    vlan trunk allowed all
interface 1/1/1
    no shutdown
    lag 10
interface 1/1/2
    no shutdown
    lag 100

For 8320, 8325, and 8400 switch series:

switch(config-if)# interface 1/1/1
switch(config-if)# no shutdown
switch(config-if)# show running-config
Current configuration:
!
...
!
vlan 1
interface lag 10
    no shutdown
    no routing
    vlan trunk native 1
    vlan trunk allowed all
interface lag 100
    no shutdown
    no routing
    vlan trunk native 1
    vlan trunk allowed all
interface 1/1/1
    no shutdown
    lag 10
interface 1/1/2
    no shutdown
    lag 100