I'm going to replace my core switch from C6509E to C9500-24Q. Using MS350-48FP, stack of 3, L2 config
This is my test setup:
Cabling: Internet -- C6509 -- MS350 -- C9500
All ports at VLAN 100 (Class C)
C9500 and MS350:
- 1 port (10G-SX)
- No aggregation
- no STP (as told be Meraki Support)
As long the C6500 port is in access mode and MS350 is in access or trunk:
- Connection is established (L1)
- all devices are pingable
- Meraki cloud is reachable (White indicator/green in dashboard)
When changing the C9500 port to trunk and MS350 is in access or trunk:
- Connection is established (L1)
- C9500 is isolated. No ping though MS-350
- MS-350 couldn't reach the Meraki cloud (amber indicator/red in dashboard)
Test also with STP, but no loop, same result.
Any idea what went wrong?
Regards Joerg