Symptom
On a Nexus 9000 switch when you have Fabric Extender (FEX) attached you are limited to a maximum of 75 vlans allowed per port as documented in the scalability guide here:
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/93x/scalability/guide-938/cisco-nexus-9000-series-nx-os-verified-scalability-guide-938.html
This should be monitored by default by the ICAM feature to alert when you get close to the scale limits. Exceeding 75 vlans per port can result in undesired behavior.
Conditions
- Nexus 9000
- Fabric Extender (FEX)
- Trunk ports to attached hosts with more than 75 VLANS allowed on a single port.
