OPERATIONAL DEFECT DATABASE
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Some versions of mGig Catalyst 9300 do not link up with various 100Mbit devices. This has been observed at 50-meter and above link lengths, but may also occur at lesser lengths. There is no specific length that the issue will or will not occur - it can vary depending on the end device, and cabling infrastructure.
Have a 100Mbit device that will not link up with the specified Catalyst 9300s. In observed cases, a cable of longer (around 50 Meters, possibly less) length was needed to create the issue. A shorter patch cable resolved the issue. However, this is not guaranteed to be a consistent set of conditions. The same 100Mb device will work on other Catalyst 9300 versions (with boardID NOT listed below), or in some cases on the same switch on the uplink module (again, models NOT listed below), at the same link length with no issue - this condition is the most significant. To check board ID for an affected switch version, issue command "show romvar" and look for "BOARDID=" C9300-24UX - Board ID 28754, 57426, 28786 C9300-48UXM - ID 28761, 57433, 28793 C9300X-48HX - ID 37009 C9300X-24HX - ID 37010 C9300X-48HXN - ID 37012 C9300X-12Y - ID 37013 C9300X- 24Y - ID 37014 C9300LM-48UX - ID 37034 , 41130 Uplink module possibly affected: C9300X-NM-8M
For the affected models, a shorter length cable or unaffected uplink module can sometimes be used to work around the issue until a software upgrade is performed. However - it is recommended to upgrade to a fixed release for any link interoperability issues with 100Mbit devices and the listed switch versions. Other switches versions not listed in this defect are not impacted by this specific issue, and thus, the device may link up successfully with those, particularly at longer link lengths.
This defect has a software fix to improve compatibility with other devices for 100-BaseTX Ethernet in conditions where signal quality is marginal, when using the listed switches, particularly at longer link lengths. If you have symptoms that match those presented or are similar, a software upgrade to a fixed version for this defect could resolve the issue. If it does not, contact Cisco TAC for assistance. If you experience a similar issue at different link speeds, with different switch models / board IDs, or with different physical media such as Fiber or Direct Attach Copper (DAC), this defect will not apply.
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