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Configuring Aggregated Ethernet Interfaces

Link aggregation of Ethernet interfaces is defined in the IEEE 802.3ad standard. The JUNOS implementation of 802.3ad balances traffic across the member links within an aggregated Ethernet bundle based on the Layer 3 information carried in the packet. This implementation uses the same load-balancing algorithm used for per-packet load balancing. For information about per-packet load balancing, see the JUNOS Routing Protocols Configuration Guide.

NOTE: The JUNOS software does not provide load balancing for multicast traffic on aggregated interfaces. If a link carrying multicast data goes down, another link carries the traffic. This provides redundancy, not more bandwidth.

For information about configuring circuit cross-connects over aggregated Ethernet, see Examples: Configuring Switching Cross-Connects.

You configure an aggregated Ethernet virtual link by specifying the link number as a physical device and then associating a set of ports that have the same speed and are in full-duplex mode. The physical interfaces can be Fast Ethernet, Gigabit Ethernet, Gigabit Ethernet IQ, or 10-Gigabit Ethernet devices. Generally, you cannot use a combination of these interfaces within the same aggregated link; however, you can combine Gigabit Ethernet and Gigabit Ethernet IQ interfaces in a single aggregated Ethernet bundle.

On the aggregated bundle, no IQ-specific capabilities such as MAC accounting, VLAN rewrites, and VLAN queuing are available. For more information about IQ-specific capabilities, see Configuring Gigabit Ethernet Accounting and Policing.

Aggregated Ethernet interfaces can be either tagged or untagged, with LACP enabled or disabled. In all cases, you must set the number of aggregated Ethernet interfaces on the chassis. You can also set the link speed and the minimum links in a bundle, as described in the following sections:

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