hi every body!
I have some confusions about the alternate port and back up port.
Cisco documents define " a backup port receives more useful bpdu from the same bridge it is on and is a port blocked"
That means backup port can only exists on the switch which has designated port,connected to shared medium.
But does it not mean that back port can not be on the same switch which has alternate port connected to shared medium?
So we have a switch which has two ports are connected to shared medium, one of the port is alternate port , what would be the other port?
Thanks a lot!
nice point this
yes the second port is put in blocking state.
the backup exists for the designated port on the shared medium so in your scenario the second port on the switch that loses the designated port election is simply put in blocked state.
It makes sense.
Hope to help