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In RSTP there is no TCN field exist then how switch will no if there is any change in the topology ?

author
rocky a
,
ZAP

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Can You answer this question?
author
Mr. Mohit Bhalla

if you see closely the new bpdu has used bit 0 for topology change , 

it is used for the same purpose as tcn field in the later one. but the behavior of rstp's topology change is different 

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