Disabling mlag ports and removing mlag config to add or delete ports from LAG, drops packets are observed
To add / delete ports from LAG, which is an MLAG port, you need to disable LAG ports, removing mlag config, add / delete ports to the LAG and enabling the ports and mlag config. Traffic gets dropped during this operation. There should be no traffic drops, as the packets should get switched via the mlag peer.
With higher numbers of 10G ports (i.e. 12 port LAG), you able to observe 10+sec of traffic drops consistently.
Black Diamond X8
It is known issue documented under CR xos0062190.
Use the below MLAG enhancement to dynamically add/delete ports from LAG CR xos0063465: "Ability to add/delete port to load shared MLAG port without disabling MLAG"
The enhancement been released with next EXOS releases