When this issue occurs, the bbe-smgd might crash on the backup RE which in-turn could lead to loss of RE redundancy and could also 
affect control plane subscriber services like new DHCP [Dynamic Host Configuration Protocol] requests, request for change in lease 
time for DHCP clients, if the primary RE fails during the daemon recovery.Use the "show system core-dumps" command to check the core file. 
The below logs could be seen in the backup RE when removing the child link from AE interface.

BBE_IFL_DETACH_TARGET_MEMBER_ERR_BAD_DB
BBE_IFL_DETACH_TARGET_MEMBER_ERR_BAD_DB2

These logs can be used to identify the issue, the "show shmlog stats log all" command can also be used to check these logs specifically.
 After observing the above detach logs restart the bbe-smgd process by executing the command "restart smg-service" in the backup 
RE proactively to avoid this issue.
On MX platforms enabled with dynamic-profiles for subscribers and the subscribers are configured over AE [Aggregate Ethernet] interface 
with targeted-distribution.When  the child links of the AE interface are removed and then added, it could lead to bbe-smgd crash in the backup RE. 
This in-turn could affect the control plane subscriber services when the primary RE fails during such event.


This issue might be seen if the following conditions are met:
* On MX platforms
* Dynamic-profiles is enabled for subscribers 
* Targeted-distribution is enabled for AE interface
* Removing and adding the child links of the AE interface

This issue is addressed in PR1633392 and fixed in later junos releases. Check out below PR link for more details:

https://prsearch.juniper.net/problemreport/PR1633392

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