Layer 3 Issue on RTN

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Hi Aung, Please try this, I hope it works for you.

If the parent and an AS are connected across a Layer 2 network, run the undo uni-mng enable command on the AS to restore the standalone mode.
If the parent is directly connected to an AS, run the undo uni-mng enable command on the AS to restore the standalone mode. Before that, ensure that the cable between the AS and parent is set to Down state. Otherwise, after the AS restarts, it registers with the parent again and enters the AS mode. A configuration example is as follows:
1. On the parent, view SVF network topology information based on the device name.
[Parent]display uni-mng topology information by-name
The topology information of the uni-mng network is as follows:
<-->: direct link : indirect link
T: Trunk ID *: independent AS
---------------------------------------------------------------------------------
Local Dev Hop Local Port T || T Peer Port Peer Dev
---------------------------------------------------------------------------------
Parent 0 GE4/0/2 1 <-->0 GE0/0/42 as1
---------------------------------------------------------------------------------
Total items displayed : 1
The physical interface of the parent connected AS 1 is GE4/0/2.

2. Shut down GE4/0/2 on the parent.
[Parent] interface gigabitethernet 4/0/2
[Parent-GigabitEthernet4/0/2] shutdown

3. Enter the console port of the AS and run the undo_uni-mng_enable command to restore the standalone mode.

Hello dear!

Can you share how you change the AS number? You'll need to modify the AS number in the BGP global attribute:

1. Log in to the NE.

2. Click Route Management > BGP > Global Attribute.

3. Choose the BGP AS number and double-click to modify the AS number:

Thank you all