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Configure Aggregated SONET/SDH Interfaces

The JUNOS software enables link aggregation of SONET/SDH interfaces; this is similar to Ethernet link aggregation, but is not defined in a public standard. The JUNOS software balances traffic across the member links within an aggregated SONET/SDH 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 Internet Software Guide: Routing and Routing Protocols.

You configure an aggregated SONET/SDH virtual link by specifying the link number as a physical device and then associating a set of physical interfaces that have the same speed.

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.

By default, no aggregated SONET/SDH interfaces are created. You must define the number
of aggregated SONET/SDH interfaces by including the device-count statement at the [edit chassis aggregated-devices sonet] hierarchy level:

[edit chassis aggregated-devices sonet]

    device-count number;

    

The maximum number of aggregated interfaces is 16, and the assigned number can range from 1 through 16. For more information, see the JUNOS Internet Software Guide: Getting Started.


SONET aggregation is proprietary to the JUNOS software and might not work with other software.

To configure aggregated SONET/SDH interfaces, assign a number for the aggregated SONET/SDH interface asx at the [edit interfaces] hierarchy level:

[edit interfaces]

asx {

...

}

The following example shows an aggregated SONET/SDH configuration:

[edit interfaces]

as0 {

    aggregated-sonet-options {

        minimum-links 1;

        link-speed oc3;

    }

    unit 0 {

        family inet {

            address 10.2.11.1/32 {

                destination 10.2.11.3;

            }

        }

    }

}

You also need to specify the constituent physical interfaces by including the aggregate statement at the [edit interfaces interface-name sonet-options] hierarchy level; for more information, see Configure SONET Link Aggregation. You can optionally specify other physical properties that apply specifically to the aggregated SONET interfaces; for details, see Configure SONET/SDH Physical Interface Properties. For a sample configuration, see Example: Configure Aggregated SONET/SDH Interfaces.

To remove the configuration statements related to asx and set the aggregated SONET/SDH interface to down state, delete the interface from the configuration:

[edit]

user@host# delete interfaces asx

However, the aggregated SONET/SDH interface is not deleted until you delete the chassis aggregated-devices sonet device-count configuration statement.

You can configure the following aggregated SONET/SDH properties:

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