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.

Tasks to configure 802.3ad link aggregation interfaces are:

•  Configuring an Ethernet Physical Interface
•  Configuring a LAG Bundle
•  Configuring IP for a LAG Bundle
•  Configuring a VLAN Subinterface for a LAG Bundle
•  Configuring a PPPoE Subinterface for a LAG Bundle
•  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

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 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

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

You can also configure a PPPoE subinterface over a VLAN subinterface over a LAG bundle. For an example of this configuration, see Example: Configuring a PPPoE Subinterface over a VLAN for a LAG Bundle.

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

interface lag

• Use to create an IEEE 802.3ad LAG interface, also known as a LAG bundle, or a subinterface for the LAG bundle.
• Examples

  host1(config)#interface lag boston

  host1(config)#interface lag boston.2

  host1(config)#interface lag boston.2.1

• Use the no version to delete the LAG bundle.
• See interface lag.

lacp

• Use to configure whether an Ethernet link in a LAG bundle participates actively or passively in the LACP.
• Use the active keyword to indicate that the Ethernet link participates in the protocol regardless of whether its Partner member link is set to active or passive LACP PDU participation.
• Use the passive keyword to indicate that the Ethernet link to transmit LACP PDUs only when it receives LACP PDUs from its Partner member link.
• By default, Ethernet links in a LAG bundle do not send LACP PDUs.
• Example

  host1(config-if)#lacp active

• Use the no version to restore the default behavior.
• See lacp.

lacp port-priority

• Use to set the priority for an Ethernet link in a LAG bundle.
• The member with the lowest value has the highest priority, and is selected to join the LAG bundle first.
• Valid values are in the range 0–65535.
• Example

  host1(config-if)#lacp port-priority 100

• Use the no version to restore the default value of 32768.
• See lacp port-priority.

member-interface

• Use to add a Fast Ethernet interface or Gigabit Ethernet interface, also known as a bundle member, to a LAG bundle.
• Example

  host1(config-if)#member-interface fastEthernet 4/0

• Use the no version to remove the specified Ethernet link from the bundle.
• See member-interface.

mpls

• Use to enable, disable, or delete MPLS on an interface. MPLS is disabled by default.
• Example

  host1(config)#mpls

• Use the no version to halt MPLS on the interface and delete the MPLS interface configuration.
• See mpls.

mtu

• Use to specify the MTU for a LAG bundle.
• Specify a value in the range 64–9188 bytes. The range for FE-8 I/O modules is 64–9042 bytes.
• This command does not work for the Fast Ethernet port on the SRP module.
• Example

  host1(config-if)#mtu 9000

• Use the no version to specify the default, 1518.
• See mtu.

pppoe subinterface lag

• Use to create a PPPoE subinterface on a LAG bundle.
• Example

  host1(config-if)#pppoe subinterface lag boston.1

• Use the no version to remove the PPPoE subinterface from the LAG bundle.
• See pppoe subinterface.

virtual-router

• From Global Configuration mode, use this command to create a virtual router or access the context of a previously created virtual router or a VRF.
• Example

  host1(config)#virtual-router boston

• Use the no version of the command only to delete the VR and return the router to the default VR.
• See virtual-router.

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