Configuring a Layer 2 dynamic aggregation group

Prerequisites

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

Procedure

Create a Layer 2 aggregate interface and access the Layer 2 aggregate interface view by entering:
```
switch(config)# interface lag <ID>
```
The range of the LAG interface ID is 1 to 256.

While creating the Layer 2 aggregate interface, the system automatically creates a Layer 2 dynamic aggregation group numbered the same.
Set the operational state of every interface in the LAG to up by entering:
```
switch(config-lag-if)# no shutdown
```
NOTE:
This command does not impact the administrative state of the member interfaces because the command was entered at the level of the LAG. To change the administrative state of a member interface, enter the command at the interface level. For example:
```
switch(config)# interface 1/1/2
switch(config-if)# no shutdown
```
On the 8320, 8325, and 8400, disable routing by entering:
```
switch(config-lag-if)# no routing
```
See the Command-Line Interface Guide for your switch and software version for more information about the no routing command.

NOTE:
On the 6200 Switch Series, routing is not supported on physical interfaces.

On the 6300 and 6400 Switch Series, routing is disabled by default.

Configure the aggregation group to operate in dynamic mode by entering:

switch(config-lag-if)# lacp mode {active | passive}

For example:

switch(config-lag-if)# lacp mode active

Configure the aggregation group to operate in fast or slow mode by entering:
```
switch(config-lag-if)# lacp rate {fast | slow}
```
For example:
```
switch(config-lag-if)# lacp rate fast
```

Assign a native VLAN ID to a trunk interface by entering:

switch(config-lag-if)# vlan trunk native <VLAN-ID>

For example:

switch(config-lag-if)# vlan trunk native 1

Use the following steps to add a maximum of eight interfaces to the LAG:
1. To assign an interface to the LAG:
```
switch(config-lag-if)# interface <PORT-ID>
```
  To assign a range of interfaces to a LAG:
```
switch(config-lag-if)# interface <PORT-ID>-<PORT-ID>
```
  For example:
```
switch(config-lag-if)# interface 1/1/1-1/1/4
```
  See the Command-Line Interface Guide for your switch and software version for more information about the interface <PORT-ID> command.
2. Assign an ID to the LAG:
```
switch(config-if)# lag <ID>
```
  For example:
```
switch(config-if-<1/1/1-1/1/4>)# lag 20
```
3. Set the administrative state of the member interface to up:
```
switch(config-if-<1/1/1-1/1/4>)# no shutdown
```

View the configuration by entering:

For 6200, 6300, and 6400 switch series:

switch(config-if-<1/1/1-1/1/4>)# show running-config

Current configuration:
!
vlan 1
interface lag 20
    no shutdown
    vlan trunk native 1
    vlan trunk allowed all
    lacp mode active
    lacp rate fast
interface 1/1/1
    no shutdown
    lag 20

switch(config-if-<1/1/1-1/1/4>)# show lacp aggregates

Aggregate name   : lag100
Interfaces       : 1/1/3 1/1/1 1/1/4 1/1/2
Heartbeat rate   : Fast
Hash             : l3-src-dst
Aggregate mode   : Active

For 8320, 8325, and 8400 switch series:

switch(config-if-<1/1/1-1/1/4>)# show running-config

Current configuration:
!
vlan 1
interface lag 20
    no shutdown
    no routing
    vlan trunk native 1
    vlan trunk allowed all
    lacp mode active
    lacp rate fast
interface 1/1/1
    no shutdown
    lag 20

switch(config-if-<1/1/1-1/1/4>)# show lacp aggregates

Aggregate name   : lag100
Interfaces       : 1/1/3 1/1/1 1/1/4 1/1/2
Heartbeat rate   : Fast
Hash             : l3-src-dst
Aggregate mode   : Active