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Configuring Link Aggregation on Satellite Devices in a Junos Fusion Enterprise

Link aggregation, as defined by IEEE 802.3ad, allows users to bundle multiple Ethernet interfaces into a single logical interface. An aggregated Ethernet interface, also known as a link aggregation group (LAG), balances traffic across its member links within the aggregated Ethernet bundle and effectively increases the uplink bandwidth. Aggregated Ethernet interfaces also increase high availability, because an aggregated Ethernet interface is composed of multiple member links that can continue to carry traffic when one member link fails.

In a Junos Fusion Enterprise, you can configure aggregated Ethernet interfaces using extended port member links to increase uplink bandwidth and high availability for endpoint devices connected to a satellite device. These aggregated Ethernet interfaces can be configured to use Link Aggregation Control Protocol (LACP).

LACP is a subcomponent of the IEEE 802.3ad standard that simplifies management of LAGs. LACP automates the addition and deletion of individual links to the LAG without user intervention, and can also prevent communication failures by detecting misconfigurations within a LAG. LACP-enabled devices exchange LACP protocol data units (PDUs) to monitor links between LAG peers. You can configure Ethernet links to actively transmit LACP PDUs, or you can configure the links to passively transmit them, sending out LACP PDUs only when they receive them from another link.

LAG and LACP configuration on extended ports in a Junos Fusion Enterprise is identical for a standalone EX Series switch. The following guidelines apply to link aggregation in a Junos Fusion Enterprise:

  • The member links must be located on the same satellite device.

  • Up to 1000 LAGs are supported, with up to 16 members per LAG.

  • LAGs are numbered from ae0 through ae4091.

  • The LAG must be configured on both sides of the link.

  • The interfaces on either side of the link must be set to the same speed and be in full-duplex mode.

To configure link aggregation in a Junos Fusion Enterprise:

  1. Configure the maximum number of aggregated Ethernet interfaces:
  2. Create and name the aggregated Ethernet interface:
    Note:

    Specify the aggregated Ethernet interface name as aex, where x is the interface instance number. The instance number can be from 0 through 4091.

  3. Assign interfaces to the aggregated Ethernet interface:

    For example:

  4. Enable LACP for the aggregated Ethernet interface:

    For information on configuring LACP parameters, see Configuring Aggregated Ethernet LACP.

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