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Configuring 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 Routing Protocols Configuration Guide.

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. Channelized OC IQ and IQE PICs do not support SONET aggregation.

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. The aggregated SONET/SDH interfaces are numbered from as0 through as15. For more information, see the JUNOS Services Interfaces Configuration Guide.

Note: SONET/SDH 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 Configuring SONET/SDH Link Aggregation. You can optionally specify other physical properties that apply specifically to the aggregated SONET/SDH interfaces; for details, see Configuring SONET/SDH Physical Interface Properties. For a sample configuration, see Example: Configuring 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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