Timeline for How is the root bridge determined in spanning tree from BPDU perspective?
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| Oct 17, 2017 at 7:12 | comment | added | john | First if you say a is the root that means the election is already over isnt it ? Second switches do not introduce additional computation like what is the ID of the switch they are sending to , so there is no such thing as sending on ports with lower / higher IDs. and No i didnt mix up states. listening leraning are the states of the election. Designated blocked is the role a port under takes after the election. If you are confused becuase i used forwarding for 'roles' than yes it is valid role | |
| Oct 16, 2017 at 6:51 | comment | added | Ram Kumar | i also read that after the election process only the root bridge sends bpdu's unless there is a topology change is this right?? and last part i think u mixed up states(listening,learning,forwarding) with roles(designated,root,blocking) | |
| Oct 16, 2017 at 6:50 | comment | added | Ram Kumar | thanks a lot for the explanation, but when u say untill all devices unanimously agree to which device is the root - when do they actually stop sending bpdu's eg if there are 4 switches abcd connected in circle and if a is the root, a sends to (b,c) and then (b/c) sends to d and by now every switch knows a is the root so do they stop sending bpdu's. my main question is what is the rule for sending bpdu's before/during election process. should u send bpdu to a switch from whom u received a bpdu with a lower bridge id or only on ports where u received a bpdu with higher bridge id. | |
| Oct 15, 2017 at 2:13 | history | answered | john | CC BY-SA 3.0 |