Configuring 802.3ad Link Aggregation

1. Configuring an Ethernet Physical Interface
2. Configuring a LAG Bundle
3. Configuring IP for a LAG Bundle
4. Configuring IPv6 for a LAG Bundle
5. Configuring a VLAN Subinterface for a LAG Bundle
6. Configuring a PPPoE Subinterface for a LAG Bundle
7. Configuring MPLS for a LAG Bundle

Configuring an Ethernet Physical Interface

To configure a member link, perform the following steps:

1. Specify a Fast Ethernet or Gigabit Ethernet interface for which you want to create a member link.
   host1(config)#interface gigabitEthernet 2/0
2. Configure LACP in passive or active mode.
   host1(config-if)#lacp active
3. Specify the speed and the duplex mode for the Ethernet interface.
   host1(config-if)#speed 100 host1(config-if)#duplex full
4. Specify the MTU.
   host1(config-if)#mtu 9000
5. To configure additional member links, repeat steps 1 through 4.

   Note: All of the member links that you configure must be on the same line module and have the same physical layer characteristics, such as speed, duplex mode, and MTU.

Configuring a LAG Bundle

To configure a LAG bundle and add member links, perform the following steps:

1. Create the LAG bundle.
   host1(config)#interface lag bundleBoston
2. Add a member link to the LAG bundle.
   host1(config-if)#member–interface gigabitEthernet 2/0
3. (Optional) Configure the minimum number of member links required in the LAG bundle for the LAG interface to be considered up.
   host1(config-if)#minimum-links 2

Configuring IP for a LAG Bundle

To configure IP for a LAG bundle, perform the following steps:

1. Specify the LAG bundle.
   host1(config)#interface lag bundleBoston
2. Assign an IP address and mask.
   host1(config-if)#ip address 192.5.127.8 255.255.255.0

Configuring IPv6 for a LAG Bundle

To configure an IPv6 address for a LAG bundle, perform the following steps:

1. Specify the LAG bundle.
   host1(config)#interface lag bundleBoston
2. Assign an IPv6 prefix address to the LAG bundle.
   host1(config-if)#ipv6 address 1::1/64

Configuring a VLAN Subinterface for a LAG Bundle

To configure a VLAN subinterface for the LAG bundle, perform the following steps:

1. Specify VLAN as the encapsulation method.
   host1(config-if)#encapsulation vlan
2. Specify the VLAN subinterface for the LAG bundle by adding a unique subinterface number to the LAG interface identification command.
   host1(config)#interface lag bundleBoston.1
3. Assign a VLAN ID for the subinterface.
   host1(config-if)#vlan id 203
4. Assign an IP address and mask.
   host1(config-if)#ip address 192.168.1.1 255.255.0.0
5. Assign an IPv6 prefix address.
   host1(config-if)#ipv6 address 1::1/64

Configuring a PPPoE Subinterface for a LAG Bundle

To configure a PPPoE subinterface for the LAG bundle, perform the following steps:

1. Specify PPPoE as the encapsulation method.
   host1(config-if)#encapsulation pppoe
2. Specify the PPPoE subinterface for the LAG bundle in either of the following ways:
   • Use the interface lag command to add a unique subinterface number to the LAG bundle name.
     host1(config)#interface lag bundleBoston.2
   • Use the pppoe subinterface lag command to add a unique subinterface number to the LAG bundle name.
     host1(config)#pppoe subinterface lag bundleBoston.2
3. Specify PPP as the encapsulation method on the PPPoE subinterface.
   host1(config-if)#encapsulation ppp
4. Assign an IP address and mask.
   host1(config-if)#ip address 192.168.1.2 255.255.0.0
5. Assign an IPv6 prefix address.
   host1(config-if)#ipv6 address 1::1/64

You can also configure a PPPoE subinterface over a VLAN subinterface over a LAG bundle. For an example of this configuration, see Example: Configuring 802.3ad Link Aggregation.

Configuring MPLS for a LAG Bundle

To configure MPLS for a LAG bundle, perform the following steps:

1. Specify the LAG bundle.
   host1(config)#interface lag bundleBoston
2. Create an MPLS interface.
   host1(config-if)#mpls