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Disabling mlag ports and removing mlag config to add or delete ports from LAG, drops packets are observed

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TitleDisabling mlag ports and removing mlag config to add or delete ports from LAG, drops packets are observed
Symptoms
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.
Environment
  • Black Diamond X8
  • EXOS 15.5.4.2
Cause
It is known issue documented under CR xos0062190.
Resolution
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
  • 16.1.3.6-patch1-2
  • 16.2.1
  • 21.1.1.4-patch1-2
  • 22.1.1
Additional notes

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