VIAVI TestCenter: B2-800G - if ports on the same FEB have one link is up and one is down, and link recovery is enabled on the down port, the port that is up will flap.

Knowledge Base - FAQ

• The customer runs a one port on a Front End Board (FEB) into the DUT to run a "snake test." • The other port on the same FEB is unreserved and is known to be link down (the port on the DUT is administratively down). • The port running the snake test will flap periodically.
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