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Description of problem:
now you have to save bond/team/bridge to correctly add MASTER=dev to slaves. This cannot be done directly but the nmtui workflow is rather leading to create it the unsupported way. 

Version-Release number of selected component (if applicable):
NetworkManager-1.4.0-17

How reproducible:
always

Steps to Reproduce:
1.nmtui
2.edit a connection
3.Add -> Bond
4.Add-> Ethernet
5.add a device to ethernet
6 OK
7.OK


Actual results:
vbenes@trautenberg:~$ cat /etc/sysconfig/network-scripts/ifcfg-Ethernet_connection_1 
TYPE=Ethernet
NAME="Ethernet connection 1"
UUID=18ead8de-7b86-444f-babb-c1d2b4d0d457
ONBOOT=yes
MASTER=b22b848d-06d3-44a4-91bd-5ad8cba6d556
SLAVE=yes
DEVICE=eth1



Expected results:
vbenes@trautenberg:~$ cat /etc/sysconfig/network-scripts/ifcfg-Ethernet_connection_1 
TYPE=Ethernet
NAME="Ethernet connection 1"
UUID=18ead8de-7b86-444f-babb-c1d2b4d0d457
ONBOOT=yes

MASTER_UUID=b22b848d-06d3-44a4-91bd-5ad8cba6d556
MASTER=nm-bond
^^ these two lines

SLAVE=yes
DEVICE=eth1


Additional info:

This should work since 9cc15d39eb5257f05d3e6633d46a5a428f417917

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2017:2299