[c-nsp] loop guard still useful?

Lee ler762 at gmail.com
Sun Jan 17 16:25:23 EST 2016

I just saw this bit about RSTP detecting unidirectional links:


  Detecting Unidirectional Link Failure

  Using the dispute mechanism included in the IEEE 802.1D-2004 RSTP
standard, the switch checks the consistency of the port role and state
in the received BPDUs to detect unidirectional link failures that
could cause bridging loops.

  When a designated port detects a conflict, it keeps its role, but
reverts to a discarding (blocking) state because disrupting
connectivity in case of inconsistency is preferable to opening a
bridging loop.

So I'm wondering if there's any reason to keep loop guard configured
on a switch?
Any current hardware that doesn't support rapidSTP?  Some other reason??


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