On 1/18/16, Saku Ytti <s...@ytti.fi> wrote: > On 18 January 2016 at 10:57, Michele Bergonzoni <berg...@labs.it> wrote: > > Hey, > >> So the dispute does half of what UDLD does, if I got it right. > > Ethernet with autonegotiation on should detect unidirectional links > automatically and go down on both ends at RTT/2 delay.
I remember 100Mb fiber connections on cat5500s could have unidirectional links, but a quick search gives me this http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10591-77.html Most recently, fiber FastEthernet hardware implementations have Far End Fault Indication (FEFI) functions in order to bring the link down on both sides in these situations. so apparently 100Mb fiber doesn't have that problem any more. I don't think 1 or 10Gb fiber ever did.. Lee _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
