Customer might notice when configuration change resulted in LAG members flapped.

Interface flap seen post family inet6 has been added.

labroot@jtac-acx710-dc-r2014# set interfaces ae1 unit 1277 family inet6

After adding above command, customer noticed below logs.

Jan 29 11:04:26 jtac-acx710-dc-r2014 mgd[13303]: UI_CFG_AUDIT_OTHER: User 'riaanv2' set: [interfaces xe-0/0/23 unit 1275 family inet6]
Jan 29 11:04:26 jtac-acx710-dc-r2014 mgd[13303]: UI_CFG_AUDIT_OTHER: User 'riaanv2' set: [interfaces ae1 unit 1277 family inet6] 

Jan 29 11:04:34 jtac-acx710-dc-r2014 kernel: lag_bundlestate_ifd_change: bundle ae1: bundle IFD minimum bandwidth or minimum links not met, Bandwidth (Current : Required) 0 : 1 Number of links (Current : Required) 0 : 1 

Jan 29 11:04:34 jtac-acx710-dc-r2014: if_pfe_ge_ifdpointchange_tlv: Child IFD xe-0/0/0 not found to be part of any LAG bundle

Jan 29 11:04:34 jtac-acx710-dc-r2014: if_pfe_ge_ifdpointchange_tlv: Child IFD xe-0/0/1 not found to be part of any LAG bundle

Jan 29 11:04:34 jtac-acx710-dc-r2014: if_pfe_ge_ifdpointchange_tlv: Child IFD xe-0/0/2 not found to be part of any LAG bundle

No issues with child link interfaces.

After investigated logs, tried the same behavior in lab and did not find the issue.

labroot@jtac-acx710-dc-r2014> show interfaces ae1 

Physical interface: ae1, Enabled, Physical link is Up

 Interface index: 129, SNMP ifIndex: 569

 Link-level type: Flexible-Ethernet, MTU: 9192, Speed: 60Gbps, BPDU Error: None, Ethernet-Switching Error: None, MAC-REWRITE Error: None,

 Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled, Minimum links needed: 1, Minimum bandwidth needed: 1bps

 Device flags : Present Running

 Interface flags: SNMP-Traps Internal: 0x4000

 Current address: 58:70:7f:4a:5f:40, Hardware address: 58:70:7f:4a:5f:40

 Last flapped: 2025-02-04 11:06:13 IST (00:07:59 ago)

 labroot@jtac-acx710-dc-r2014> configure 

Entering configuration mode

[edit]

labroot@jtac-acx710-dc-r2014# rollback 1 

load complete

[edit]

labroot@jtac-acx710-dc-r2014# show | compare 

[edit interfaces ae1 unit 1277]

+   family inet6;

[edit]

labroot@jtac-acx710-dc-r2014# commit 

commit complete

[edit]

labroot@jtac-acx710-dc-r2014# run show system commit 

0  2025-02-04 11:15:05 IST by labroot via cli

labroot@jtac-acx710-dc-r2014> show interfaces ae1 extensive 

Physical interface: ae1, Enabled, Physical link is Up

 Interface index: 129, SNMP ifIndex: 569, Generation: 132

 Link-level type: Flexible-Ethernet, MTU: 9192, Speed: 60Gbps, BPDU Error: None, Ethernet-Switching Error: None, MAC-REWRITE Error: None,

 Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled, Minimum links needed: 1, Minimum bandwidth needed: 1bps

 Device flags : Present Running

 Interface flags: SNMP-Traps Internal: 0x4000

 Current address: 58:70:7f:4a:5f:40, Hardware address: 58:70:7f:4a:5f:40

 Last flapped: 2025-02-04 11:06:13 IST (00:12:05 ago) >>>>> No flaps seen

Also, tested same changes in customer lab device and did not find the issue.

So, concluded this as one time issue and which occurred rarely when committing configuration.