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[netdevice] Add a generic concept of a "blocked link"
When Spanning Tree Protocol (STP) is used, there may be a substantial delay (tens of seconds) from the time that the link goes up to the time that the port starts forwarding packets. Add a generic concept of a "blocked link" (i.e. a link which is up but which is not expected to communicate successfully), and allow "ifstat" to indicate when a link is blocked. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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