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Beginner

single cable connected to same switch.

Hello Guys,

 

What will happen if we connect single cable on two different port (port 1 and port 2) of same switch.

 

1st condition

1-> both port are in same vlan 10 and PVST is working.

2->both port are in different vlan (10 & 20) and pvst is working.

 

2nd condition

 

1->on both port port fast  and bpdu gaurd is enabled.

 

my assumption are:

1st condition 

1-> it will not form loop. pvst will block one port

2-> it will form loop as both vlan will be having diferent stp instance and they       wont be able to know

 

2nd condition

1- it will not form loop as bpdu gaurd on one of port will drop the bpdu

 

can any one help on this

 

 

Everyone's tags (5)
2 REPLIES 2
Beginner

Re: single cable connected to same switch.

This wouldn't be a good thing as this could cause network instability in your environment.  This happened years ago at one of my remote offices and it caused problems. I'm assuming this is a lab.

Beginner

Re: single cable connected to same switch.

hi dialerstring,

Thanks for replying i am curious to know what will happen, not implementing anywhere.

What will be the output ??
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