EVPN ESI behavior

ACX7024 is DF for a ESI active/standby:  When a underlying IFL is brough down, all IFLs go down as well under the IFD.  Below exmaple has AE7 with 2 IFL.  One is brought down and other that is up goes down as well.
 
labroot@f22-37# run show interfaces ae7 | match ccc   
    Flags: Up SNMP-Traps VLAN-Tag[ 0x8100.10 ]  Encapsulation: VLAN-CCC DF
    Protocol ccc, MTU: 9192
    Flags: Up SNMP-Traps VLAN-Tag[ 0x8100.110 ]  Encapsulation: VLAN-CCC DF
    Protocol ccc, MTU: 9192
 
labroot@f22-37# run show evpn vpws-instance AL01            
Instance: AL01, Instance type: EVPN VPWS, Encapsulation type: MPLS
  Route Distinguisher: 10.100.0.1:65534
  Number of local interfaces: 2 (2 up)
 
    Interface name  ESI                            Mode          Role       Status     Control-Word    Flow-Label-Tx    Flow-Label-Rx
    ae7.10          00:00:00:00:11:22:33:00:01:00 single-active   Primary    Up         No              No               No 
        Local SID: 100010 Advertised Label: 17
        Remote SID: 200010
 
    Interface name  ESI                            Mode          Role       Status     Control-Word    Flow-Label-Tx    Flow-Label-Rx
    ae7.110         00:00:00:00:11:22:33:00:01:00 single-active   Primary    Up         No              No               No 
        Local SID: 100110 Advertised Label: 18
        Remote SID: 200110
  Number of protect interfaces: 0
 
    Fast Convergence Information
    ESI: 00:00:00:00:11:22:33:00:01:00 Number of PE nodes: 1
        PE: 192.168.2.2
            Advertised SID: 200110
            Advertised SID: 200010
 
    DF Election Information for Single-Active ESI
    ESI: 00:00:00:00:11:22:33:00:01:00
    DF Election Algorithm: Preference based
    Primary PE: 10.100.0.1, Preference: 200
    Backup PE: 192.168.2.2, Preference: 100
    Last DF Election: 2024-05-21 14:34:58
 
 
Disable interface ae7.110
 
labroot@f22-37# set interfaces ae7.110 disable
 
[edit]
labroot@f22-37# commit
commit complete
 
 
abroot@f22-37# run show interfaces ae7 | match ccc         
    Flags: SNMP-Traps CCC-Down VLAN-Tag[ 0x8100.10 ]  Encapsulation: VLAN-CCC DF
    Protocol ccc, MTU: 9192
    Flags: Down SNMP-Traps CCC-Down 0x00000004 VLAN-Tag[ 0x8100.110 ]  Encapsulation: VLAN-CCC DF
    Protocol ccc, MTU: 9192
 
 
labroot@f22-37# run show evpn vpws-instance AL01      
Instance: AL01, Instance type: EVPN VPWS, Encapsulation type: MPLS
  Route Distinguisher: 10.100.0.1:65534
  Number of local interfaces: 2 (1 up)
 
    Interface name  ESI                            Mode          Role       Status     Control-Word    Flow-Label-Tx    Flow-Label-Rx
    ae7.10          00:00:00:00:11:22:33:00:01:00 single-active   Backup     Up         No              No               No 
        Local SID: 100010 Advertised Label: 17
        Remote SID: 200010
 
    Interface name  ESI                            Mode          Role       Status     Control-Word    Flow-Label-Tx    Flow-Label-Rx
    ae7.110         00:00:00:00:11:22:33:00:01:00 single-active   Backup     Down       No              No               No 
        Local SID: 100110
        Remote SID: 200110
  Number of protect interfaces: 0
 
    Fast Convergence Information
    ESI: 00:00:00:00:11:22:33:00:01:00 Number of PE nodes: 1
        PE: 192.168.2.2
            Advertised SID: 200110
            Advertised SID: 200010
 
    DF Election Information for Single-Active ESI
    ESI: 00:00:00:00:11:22:33:00:01:00
    DF Election Algorithm: Preference based
    Primary PE: 192.168.2.2, Preference: 100
    Last DF Election: 2024-05-21 14:38:21
 
 
 
Peer:
 
labroot@f23-42# run show interfaces ae7 | match ccc
    Flags: Up SNMP-Traps 0x4000 VLAN-Tag [ 0x8100.10 ]  Encapsulation: VLAN-CCC
    Protocol ccc, MTU: 9192
Flags: Up SNMP-Traps 0x4000 VLAN-Tag [ 0x8100.110 ]  Encapsulation: VLAN-CCC
    Protocol ccc, MTU: 9192
 
labroot@f23-42# run show evpn vpws-instance AL01      
Instance: AL01, Instance type: EVPN VPWS
  Route Distinguisher: 192.168.2.2:65534
  Number of local interfaces: 2 (2 up)
 
    Interface name  ESI                            Mode          Role       Status     Control-Word    Flow-Label-Tx    Flow-Label-Rx
    ae7.10          00:00:00:00:11:22:33:00:01:00single-active   Primary    Up         No              No               No 
        Local SID: 200010 Advertised Label: 17
        Remote SID: 100010
 
    Interface name  ESI                            Mode          Role       Status     Control-Word    Flow-Label-Tx    Flow-Label-Rx
    ae7.110         00:00:00:00:11:22:33:00:01:00single-active   Primary    Up         No              No               No 
        Local SID: 200110 Advertised Label: 20
        Remote SID: 100110
  Number of protect interfaces: 0
 
    Fast Convergence Information
    ESI: 00:00:00:00:11:22:33:00:01:00 Number of PE nodes: 1
        PE: 10.100.0.1
            Advertised SID: 100010
 
    DF Election Information for Single-Active ESI
    ESI: 00:00:00:00:11:22:33:00:01:00
    DF Election Algorithm: Preference based
    Primary PE: 192.168.2.2, Preference: 100
    Last DF Election: 2024-05-21 14:38:22

This is correct behavior. To avoid this you can use ESI/IFL or use ESI active/active.

https://www.juniper.net/documentation/us/en/software/junos/evpn-vxlan/topics/concept/evpn-bgp-multihoming-overview.html