We're using a lot of fiberworks 8+1ch CWDM panels. The previous week we had a 10 second (unknown cause) interruption to a link between two sites. We're running 10Gbit on channels 1550, 1570, 1590, 1610, the previous 4 are 1Gbit. The link is about 40km long, but due to multiple CWDM panels on the way we have to use 80km optics. The 10Gigs are also protected by MacSec.
1550nm came back up as expected. C9200
1570nm didnt come back up. C9300
1590nm didnt come back up, and the switch in the switchstack that has the SFP+, a Catalyst 9300 went into some sort of error, all ports were green and orange. The other switch in the stack, also C9300, had one of two regular Gi ports stop passing traffic to a different switchstack (Gi1/0/1+Gi1/0/2 goes to a separate switch, Gi1/0/1 and Gi1/0/2, and Gi1/0/1 stopped, Gi1/0/2 continued).
The optics on the affected switch (1590nm) reports it has a low signal, -25db, threshold being -24db. Only this end and this single switch reports low signal.
To remediate the issue, we booted the lower switch in the stack using 1590nm by taking its power. As soon as the power was taken from it, the 1570nm interface on a separate switch came back up again.
Am I seeing interference / chromatic distortions?
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