[Bridge] how bridge do the state transfer from learing to forwarding

[Chris Healy]

Minor correction to my previous statement:

INCORRECT
Provided there is no topology change that would result in the logic taking
the port back to DISABLED

CORRECT
Provided there is no topology change that would result in the logic taking
the port back to BLOCKING


On Mon, Apr 14, 2014 at 7:18 PM, Chris Healy <cphealy at gmail.com> wrote:

> 1) The initial state of a port if it is running STP is disabled.  Once
> there is link, it will transition to blocking.  After that point, depending
> on the state of the rest of the network, it will either stay blocking or
> attempt to transition to forwarding.
>
> 2) If a port state is in learning, that means that the bridge has
> determined that it is OK for the port to go to forwarding, but it has not
> been in the learning state for a long enough period of time. (learning is a
> transitionary time period in the STP when a port will learn mac addresses
> but will not forward traffic.)  Provided there is no topology change that
> would result in the logic taking the port back to disabled, the local port
> state should go from learning to forwarding after 1x the forward delay.
> (This assumes the link does not go down, in which case the port state will
> go to disabled.)
>
> Hope that helps,
>
> Chris
>
>
> On Mon, Apr 14, 2014 at 7:08 PM, longguang.yue <kernelluck at 163.com> wrote:
>
>> hi,all
>> 1.
>> if the initial state of port is learning?
>>
>> 2.
>> in what case, state trandfers from learing to forwarding, what is the
>> condition?
>>
>>
>> thanks
>>
>>
>>
>
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