This KB explains how to configure an Aggregated Ethernet interface with childs links that have different speed rates.

By default, Junos devices will only create Aggregated Ethernet interfaces when all the child links run on the same speed but some times you might need to build an aggregated link using interfaces that has different speeds.

Here is described how to configure mixed-rate aggregated Ethernet bundle on your device:

Step 1: Specify the number of aggregated Ethernet bundles you want on your device.

set chassis aggregated-devices ethernet device-count number

Step 2: Specify the members you want to include within the aggregated Ethernet bundle.

set interfaces ge-0/0/0 gigether-options 802.3ad ae0

set interfaces xe-0/0/0 gigether-options 802.3ad ae0

Step 3: Specify the mixed speed for the aggregated Ethernet links.

set interfaces ae0 aggregated-ether-options link-speed mixed

Step 4: Specify the minimum bandwidth for the aggregated Ethernet links.

set interfaces ae0 aggregated-ether-options minimum-bandwidth

Step 5: Verify and commit the configuration.

user@host# run show configuration interface ae0

user@host# commit

user@host# run show interface ae0 extensive

Note: Changing the configuration of a mixed aggregated Ethernet link can result in aggregated Ethernet link flapping. If needed, do the change over Maintenance Window time.