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RSTP Backup Port

AlceoAlceo Member Posts: 80 ■■□□□□□□□□
in CCNA & CCENT
I'm having trouble understanding this port role, can anyone make an example of it?
A diagram in packet tracer will be very appreciated, I'm trying to do it but I only manage to have port in the alternate role.
Thanks.
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    james43026james43026 Member Posts: 303 ■■□□□□□□□□
    I'll start with explaining an alternate port first. A alternate port is a blocking port that provides an alternate path to the root bridge through a different network segment. A backup port is a blocking port that is connected to the same network segment as a designated port or a root port and is a backup since it doesn't change the physical path to the root bridge.
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    AlceoAlceo Member Posts: 80 ■■□□□□□□□□
    I think I've understood it but what about the picture below, is that correct?
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    james43026james43026 Member Posts: 303 ■■□□□□□□□□
    Yes, you are correct in the picture provided. And the other port that is blocking on that same switch, would be an alternate port.
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