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¿Qué se está ejecutando en el controlador? ¿Ha intentado escribir "snmp version v2c enable? Encontré un problema similar. Tuve que actualizar el código que vino en el controlador a 8.2. Eso resolvió el problema.
A star topology should be fine. Just make sure your running spanning-tree on all of your switches to prevent loops.Sent from Cisco Technical Support iPhone App
It looks like you do not have a image to load from on the flash. If you can get to the flash card try putting a image file from cisco on it and power it down and back up.Sent from Cisco Technical Support iPhone App