Configuring 802.3ad Link Aggregation

To configure link aggregation on Ethernet interfaces, you must configure the Ethernet interface, create the LAG bundle, and add the Ethernet interface as a member link in the LAG bundle. Optionally, you can then configure IP, a VLAN subinterface, a PPPoE subinterface, or MPLS for the LAG bundle.

For more information about specifying LAG interfaces and subinterfaces on E Series routers, see Interface Types and Specifiers in JunosE Command Reference Guide.

Tasks to configure 802.3ad link aggregation interfaces are:

Configuring an Ethernet Physical Interface

To configure a member link, perform the following steps:

Specify a Fast Ethernet or Gigabit Ethernet interface for which you want to create a member link.
host1(config)#interface gigabitEthernet 2/0
Configure LACP in passive or active mode.
host1(config-if)#lacp active
Specify the speed and the duplex mode for the Ethernet interface.
host1(config-if)#speed 100 host1(config-if)#duplex full
Specify the MTU.
host1(config-if)#mtu 9000
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:

Create the LAG bundle.
host1(config)#interface lag bundleBoston
Add a member link to the LAG bundle.
host1(config-if)#member–interface gigabitEthernet 2/0
(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:

Specify the LAG bundle.
host1(config)#interface lag bundleBoston
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:

Specify the LAG bundle.
host1(config)#interface lag bundleBoston
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:

Specify VLAN as the encapsulation method.
host1(config-if)#encapsulation vlan
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
Assign a VLAN ID for the subinterface.
host1(config-if)#vlan id 203
Assign an IP address and mask.
host1(config-if)#ip address 192.168.1.1 255.255.0.0
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:

Specify PPPoE as the encapsulation method.
host1(config-if)#encapsulation pppoe
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
Specify PPP as the encapsulation method on the PPPoE subinterface.
host1(config-if)#encapsulation ppp
Assign an IP address and mask.
host1(config-if)#ip address 192.168.1.2 255.255.0.0
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:

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