I am having some difficulties to understand the spanning-tree protocol. When this protocol mentions that the maximum diameter is 7, does that means that a maximum of 7 or 8 bridges allowed in a spanning-tree domain.
If we consider that the Message_age_overestimate is = (dia – 1) x overestimate_per_bridge (1 as per Cisco standard) = dia – 1 = 6
End-to-end_BPDU_propa_delay = ((lost_msg + 1) x hello) + ((BPDU_Delay x (dia – 1)) = ((3 + 1) x hello) + ((1 x (dia – 1)) = 4 x hello + dia – 1 = 4 x 2 + 6 = 14 sec
My question is how can used the value 6 as Message_age_overestimate with 7 bridge when the age between the root bridge and the first bridge is 0, the max age when reaching the last switch should be set to 5 not 6.
I am also trying to understand why the 6 seconds for the BPDU propagation delays since the worst case scenario is when we loose the first root switch and only BPDU must only go through 5 switches to reach the last switch, BPDU propagation delay should correspond to 5 switches. I have attached a pdf drawing just to clarify my question.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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