During the troubleshooting of one of the two fibers that connect mad-5-a72 to mad-1-a71, our supplier has carried out an inversion between the fiber that was functional and that down.
On this POP, we have 4x10G between 2 devices that are actually 2 fibers on which we put 2x10G DWDM (which allows multiplexing).
Part of the POP has been isolated for several seconds.

For information, during the outage that affects half the capacity to mad-1-a71, usually a part of outgoing traffic is redirected through Madrid via Paris.