Describes the integration of PTP and DLR that enables transparent clock VLAN changes on Device Level Ring networks.
Precision Time Protocol over Device Level Ring is a network integration feature that
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enables the use of PTP transparent clock to change VLANs on a Device Level Ring (DLR),
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delivers fast convergence in time-sensitive applications while ensuring that neither DLR nor PTP cause synchronization faults during an outage, and
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prevents PTP reconvergence on PTP endpoint devices when there is a DLR fault or recovery.
Feature availability and requirements
Beginning with the Cisco IOS XE 17.13.1 release, when you use Precision Time Protocol (PTP), you can use the transparent clock to change VLANs on a Device Level Ring (DLR). Previously, if you used the transparent clock while using PTP, you could not change VLANs. To change VLANs, you needed to switch to a boundary clock.
This feature is supported only on Cisco Catalyst IE3400 Rugged Series Switches and Cisco Catalyst IE3400 Heavy Duty Series Switches. See Restrictions for multiple VLAN support and PTP over DLR.
This guide provides information about PTP over DLR, including guidelines and configuration steps. For detailed information about PTP and DLR, see the guides on cisco.com:
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The chapter "Precision Time Protocol" in this guide.
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The chapter "Device Level Ring" in Redundancy Protocol Configuration Guide, Cisco Catalyst IE3x00 and IE3100 Rugged, IE3400 Heavy Duty, and ESS3300 Series Switches