#4 Migrate BridgeAssurance -> AutoIsolate

[Vitalii Demianets]

802.1Q-2011 has a nice feature named "AutoIsolatePort" (see chapter 13.21 "Fragile bridges") which is aimed to do the work currently implemented as NetworkPort/ba_inconsistent logic in mstpd.
It is only logical to do it in standard-compliant way. So, we should implement AutoIsolate/isolate feature of the 802.1Q-2011 instead of the self-invented NetworkPort/ba_inconsistent.

[Vitalii Demianets]

• Description has changed:

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 802.1Q-2011 has a nice feature named "AutoIsolatePort" (see chapter 13.21 "Fragile bridges") which is aimed to do the work currently implemented as NetworkPort/ba_inconsistent logic in mstpd.
 It is only logical to do it in standard-compliant way. So, we should implement AutoIsolate/isolate feature of the 802.1Q-2011 instead of the self-invented NetworkPort/ba_inconsistent.
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-There is only one difference: currently NetworkPort is not only the port which checks for the incoming BPDUs at regular intervals, but also sends out BPDUs at regular intervals even when not required by standard. We sould consider if we want to preserve this behaviour. If not - then we could remove NetworkPort setting completely.