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Cisco Bug: CSCvu73789 - PTP c9500 as BC and c9300 as TC with GMC attached: Clock Redundancy not working

Last Modified

Sep 01, 2020

Products (118)

  • Cisco Catalyst 9500 Series Switches
  • Cisco Catalyst 9300-48UXM-A Switch
  • Cisco Catalyst 9410R Switch
  • Cisco Catalyst 9200L-48PXG-2Y Switch
  • Cisco Catalyst IE-3400H-16T Heavy Duty Switch
  • Cisco Catalyst C9500-16X-E Switch
  • Cisco Catalyst 9300L-48UXG-4X-A Switch
  • Cisco Catalyst 9400 Supervisor Engine-1XL-Y
  • Cisco Catalyst 9200L-48P-4X Switch
  • Cisco Catalyst 9300-48H-A Switch
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Known Affected Releases


Description (partial)

In a PTP network with an active and passive GMC, that are attached to c9300 acting as in transparent clock (TC) mode, the switchover from active to passive GMC does not happen. If the GMC goes down, the uplink remains in slave mode. 
This behavior is not observed in a network with all devices in boundary clock (BC) mode.

The PTP network must have devices acting in Transparent Clock mode and GMC (Grand master clocks) must be attached to TC devices.
SW is 17.2.1
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