cnp3-ebook

protocols/ethernet

French

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Assume now that `Switch9` boots and immediately receives `Switch1` 's `BPDU` on port 1. `Switch9` computes its own `BPDU = <1,1,9,1>` (resp. `BPDU = <1,1,9,2>`) on port 1 (resp. port 2) and port 1 becomes the `Root` port of this switch. The `BPDU` is sent on port 2 of `Switch9` and reaches `Switch4`. `Switch4` compares the priority vectors. It notices that the last computed vector (i.e., `V[2] = <1,2,9,2,2>`) is better than `V[1] = <1,3,1,1,1>`. Thus, `Switch4`'s `BPDU` is recomputed and port 2 becomes the `Root` port of `Switch4`. `Switch4` compares its new `BPDU = <1,2,4,p>` with the last `BPDU` received on each port (except for the `Root` port). Port 1 becomes a `Blocked` port on `Switch4` because the `BPDU=<1,0,1,1>` received on this port is better.

4 years ago

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