Thursday, November 14, 2013

CCDP - ARCH - UDLD (UniDirectional Link Detection):

  • Used where there are fibre links between switches (but can also be applied to Copper interfaces)
  • Interface could be seen as Up/Up but due to a mismatch on the tx/rx pairs the comms become unidirectional 
  • UDLD Normal mode error-disabled the end that detected the unidirectional state - default mode
  • UDLD Agressive mode disables both ends - set it with the [agressive] switch
  • Uses 15 sec hello timer
  • Can be applied globally or on the interface

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