I have various MS225 switches that are connected to a Cisco 9300 via Multimode Fiber SC connections. They use GLC-SX-MMD 1Gb transceivers on each switch. The 9300 is using the same on it's TenGigabit Interface, a 1Gb GLC-SX-MMD. When we perform an firmware update on the Meraki's or when the Meraki's shut down due to a long term power outage, then I have to reset the GigTen ports on the 9300 for the 2 switches (9300 to MS225) to communicate. The logs on the 9300 state a Dec 26 18:54:24: %UDLD-4-UDLD_PORT_DISABLED: UDLD disabled interface Te1/1/4, aggressive mode failure detected Dec 26 18:54:24: %PM-4-ERR_DISABLE: udld error detected on Te1/1/4, putting Te1/1/4 in err-disable state. Any ideas? Do I have a bad SFP or cable? We have tried changing them with newer fiber cables and SFP but they still do this when I have an upgrade or power outage. Otherwise, once they work, after multiple port reset, they stay on permanently or until they get restarted. Thoughts?
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