TCN acknowlegement in STP

[chandra_rc16]

The Root bridge acknowledges the TCN by sending configuration BPDUs with TCA bit set.

Before to it the designated bridge will acknowledge the bridge that generated a TCN because the bridge that identified the topology change will continue to send TCN until it gets acknowledgement.

Q. As an acknowledgment, what type of BPDU will the designated bridge send to the bridge that identified toplogy change ?

Is it the same BPDU as root bridge sends ?

Regards,

Chandu

[Karthick Murugan · Accepted solution]

Hi Chandu,

The designated bridge acknowledges the TCN by immediately sending back a normal       configuration BPDU with the topology change acknowledgement (TCA) bit set

Hope it helps!!

Thanks

Karthick Murugan

CCIE#39285

[Karthick Murugan]

You can refer to the below CISCO document that explains the same.

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080094797.shtml

Thanks

Karthick Murugan

CCIE#39285