12-05-2022 09:26 PM
Switch is connected to router and on switch ,BPDU guard is enabled globally and on switch port going to router--we have command spanning-tree portfast trunk
and now switch port going to router is in error-disabled state so shall we remove command
spanning-tree portfast trunk?
12-05-2022 09:42 PM
what is the reason for err-disabled. you can se that on console, when plugs the cable between router and switch
12-06-2022 01:49 AM
what spanning tree running, if that is the router (as end device it has no effect)
is this single link or port-channel trunk ? what other config in the port ? (show run interface x/x - post switch and router)
error disable can cause many reasons, so you need to see what is teh reason ? show interfaces status err-disabled
12-06-2022 01:51 AM - edited 12-06-2022 01:51 AM
are you use the ethernet module of router or router-port ?
12-07-2022 12:42 PM
Hi all,
i checked the switch port and we are seeing input errors and CRC errors .also I put command sh interfaces status error-disabled and it is showing reason link flap so Do i have to check physical layer?
12-07-2022 01:07 PM
Yes sure, also check the MTU in both side.
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