I have 3 questions about RSTP:
1. In STP durring max-age time (20s) ports are in blocking state. Durring that time root-bridge election occurs (for diameter 7 it will take at most 14s), then root/designated/non-designated port are choosen.
And how does the root-bridge election looks in RSTP ? How long does it take ? Do we also need 20s for that ?
(i've read http://cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml but there is nothing about root-bridge election)
2. RSTP convergention: when will it end ?
Let's suppose we have S1-S2-S3-S4-S5. S3 is root bridge. Now let's connect S1 with S5.
Do i understeand correctly that synchronisation will be only between S1 and S5 ? After setting designated port from one side and alternate port from the other synchronisation will end ? Or maybe it will spread across whole network ?
3. In stable topology hello BPDU are send only to designated(forwarding) ports. Durring root election process they are send to all (blocking) ports. When is this logic changed ? When switch knows that is should start sending BPDU hello only on designated ports ? (in RSTP) ?
2) I made an error in writing I wanted to mean if there is no change in root port in S1 and S5 then no other switches are involved.
I should have written "if the answer is false to first answer then ..."
Sorry for confusion
Hope to help