Enabling DOM / troubleshooting QSFP issue

[Stuart Patton]

Hi,

I am troubleshooting an issue with an L3OUT that is bouncing/flapping periodically.  It looks to me to be a physical issue but I am struggling slightly.  The ACI switch is a Nexus 93180YC-FX which is connected to my core which is C9500-48Y4C.  Both ends are using genuine Cisco QSFP-40/100-SRBD and short (eg 10-15m) OM4 patch cable directly between the two switches.

On my core switch, I see some odd TX optical levels on lane 1 and 2 but DOM is not enabled on my fabric so I can't see the RX values on the ACI end.

Is it impactive to enable DOM in the fabric, ie will ports bounce at all?

Aside from that, does anyone with experience of multi-lane optics know if this is a clear fault with the transceiver?

Thanks,

Stuart

[M02@rt37]

Hello @Stuart Patton 

DOM simply provides additional monitoring capabilities for optical transceivers, allowing you to view parameters like optical power levels and temperature ; so it shouldn't inherently cause ports to bounce or disrupt traffic.