I have configured minimum links to 1 in both side.
When one link get down, the AE is still Up linke this :
****@GHSR02> show interfaces terse | match ae0 ge-0/2/1.0 up up aenet --> ae0.0 ge-1/1/0.0 up down aenet --> ae0.0 ae0 up up ae0.0 up up inet 172.26.255.118/30
set chassis aggregated-devices ethernet device-count 5
set interfaces ge-1/1/0 gigether-options 802.3ad ae0
set interfaces ge-0/2/1 gigether-options 802.3ad ae0
set interfaces ae0 aggregated-ether-options minimum-links 1 set interfaces ae0 aggregated-ether-options link-speed 1g
set interfaces ae0 mtu 4470 set interfaces ae0 unit 0 description Towards_MRSR02 set interfaces ae0 unit 0 family inet mtu 1522 set interfaces ae0 unit 0 family inet address 172.26.255.118/30 set interfaces ae0 unit 0 family mpls
But the peers are not seeing each other. I just wanted to highlight that the media in between are FO.
And that no lacp is set. Cause the peers are not seeing each other when I set lacp active in one side.
I am wondering whether it makes sens to configure LAG between routers since all the posts I am seeing are between Routers and Switches.
"set interfaces ae0 aggregated-ether-options link-speed 1g" is not require. "ae" bundle set/adjuest link-speed as per available members/child links.
I can not comment why you configure "inet mtu". As a standard practice mtu should set on "ae" bundle globle hierarchy.
Comming to your actual issue,
Is there any intermediate NEs are in between like transmission device or any L1/L2 devices. If Yes, then member links can not goes off (down) physically. Due to which router understand link is UP and he push the traffc on all members links which cause traffic impact. To avoid such condition, I recommand to configure LACP "active" on both devices.
Remaining configuration looks fine at Juniper side, however, I cannot confirm the other end device configuration as that is not posted in forum.