in RSTP,if shutdown root port , can trigger P/A process?

[fly]

Dear Sir/Madam,

   i test it, if i shutdown root port can cause designated port go into designated discard state, and send proposal bit.

    I know for RSTP if root port transfer to other new root port,such as a new line comes up,  old root port will go into designated discard state and trigger P/A

     if i shutdown old root port ,   there is no root port at this moment,   Does this trigger P/A process on other designated port ?

     I haven't find any official  document to say this detail.

     Thank you!

J

[paul driver · Accepted solution]

Hello
When you shut down a root port on a switch that has dual paths to the root then RSTP will just transition the blocked port into a forwarding state and will become the root without any P/A

However when you enable one of these point-point ports RSTP PA would be initated

res
Paul

[fly]

HI paul

  I tested it ,thank you!

Tom