trunking and bpdu

[liju1488]

Consider three switches two of them are connected as trunk link back to back and third switch two connections going to each of the other two switches. will there be a loop?

[Julio E. Moisa · Accepted solution]

Hi

 if the spanning tree is running properly on the three switches you will not have any layer 2 loop problem, one of the interface will be put in blocking to avoid make a loop. 

These links could be useful:

http://www.techiereader.com/2016/06/21/understanding-stp/

http://packetlife.net/blog/2009/oct/15/stp-your-friend/

Hope it is useful

:-)

[liju1488]

thank you julio, just in case if two switches are stacked and then from another switch two ports connecting to two ports on the stack switch.. there also if stp is default working means no loop correct?