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STP edge port feature with TCN

Created: Dec 11, 2020 00:03:28Latest reply: Dec 11, 2020 00:37:21 351 2 0 0 0
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Dears,


As described in the Huawei document the when any incident has happened on port or stp level this will lead to generating BPDU with TCN set toward root switch and root send new BPDU to all downstream switches with TC bit set.




the latest BPDU will help to flush all MAC addresses which have assigned to ports in order to speed up the convergence.


So my Question:

if we enable stp edged-port on a specific port, can this stop the functionality of TCN with flush the MAC addresses on this port or not.


Thank you in advance.


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Popeye_Wang
Admin Created Dec 11, 2020 00:37:21

Hi,

Your understanding is correct. If an interface is set as edge-port, when the interface status changes(down to up), the device will not send TCN BPDU, and when received TCN BPDU, the mac entries of the edge-port will not be flush/deleted.


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  • x
  • convention:

Shark_85
Shark_85 Created Dec 11, 2020 13:36:33 (0) (0)
Thank you for your reply.
just to confirm the direction of TCN:  when a switch receives a TCN from a different port ( not edge ) all edge ports in this switch will maintain the mac addresses and will not flush it ?  
All Answers

Hi,

Your understanding is correct. If an interface is set as edge-port, when the interface status changes(down to up), the device will not send TCN BPDU, and when received TCN BPDU, the mac entries of the edge-port will not be flush/deleted.


View more
  • x
  • convention:

Shark_85
Shark_85 Created Dec 11, 2020 13:36:33 (0) (0)
Thank you for your reply.
just to confirm the direction of TCN:  when a switch receives a TCN from a different port ( not edge ) all edge ports in this switch will maintain the mac addresses and will not flush it ?  

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