Committing CoS change from AE interface to its member link interface fails at 'commit check'

While implementing migration from an aggregate Ethernet (AE) interface to an XE(GE) interface as member link change, Junos reports failure of check-out. This occurs while committing a class of service (CoS) change from AE interface to its member link interface. This article describes the issue and suggests a two-phase commit sequence.

1. Initial Configuration:

user@re0-router# show class-of-service interfaces ae17 | display inheritance no-comments 
output-traffic-control-profile Qos-control-profile-test;  <<<<< Base_line config
[snipping...]

user@re0-router# show interfaces ae17 
aggregated-ether-options {
    minimum-links 1;
    lacp {
        active;
    }
}
unit 0 {
    family inet {
        address 192.168.1.1/30;
    }
}

user@re0-router# show interfaces xe-5/2/3 
gigether-options {
    802.3ad ae17;
}

2. Remove member link from AE interface:

user@re0-router# load override remove-xe-interface.conf
load complete

[edit]
user@re0-router# show interfaces xe-5/2/3 
unit 0 {
    family inet {
        address 192.168.1.1/30;
    }
}

[edit]
user@re0-router# show interfaces ae17 
disable;

[edit]
user@re0-router# show class-of-service interfaces ae17 | display inheritance no-comments 

[edit]
user@re0-router# show class-of-service interfaces xe-5/2/3 | display inheritance no-comments 
output-traffic-control-profile Qos-control-profile-test;  <<<< Issue
[snipping...]

3. Commit verification:

user@re0-router# commit check 
[edit class-of-service interfaces xe-5/2/3]
  'output-traffic-control-profile'
    config not allowed on interface xe-5/2/3
error: configuration check-out failed

When a member-link (for example, xe-5/2/3) is removed from the AE bundle and CoS configuration is added to the interface (xe-5/2/3), the commit command fails:

The root cause is that cosd determines if the integrated field diagnostic (IFD) is a member of the AE bundle from the kernel information. When a member-link (for example, xe-5/2/3) is removed from the AE bundle and CoS configuration is added to the interface (xe-5/2/3) with the same commit command, then AE membership information is not updated until the commit command executes; at this point the commit fails.

The solution is to perform the commit in two phases.

Remove the member-link (for example, xe-5/2/3) from the AE bundle and execute the commit.
Add the CoS configuration to the interface (for example, xe-5/2/3) and execute the commit.

Committing CoS change from AE interface to its member link interface fails at ‘commit check’

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