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

fly
Level 2
Level 2

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

1 Accepted Solution

Accepted Solutions

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



Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

View solution in original post

2 Replies 2

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



Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

HI paul

  I tested it ,thank you!

Tom

Review Cisco Networking for a $25 gift card