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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 22 Configuring Clocking
Configuring PTP for the Cisco ASR 901 Router
Configuring PTP for the Cisco ASR 901 Router
Note Before configuring PTP, you should set the system time to the current time. See Setting System Time to
Current Time section for configuration details.
This section contains the following topics:
• Restrictions
• Setting System Time to Current Time
• Configuring PTP Ordinary Clock
• Configuring PTP in Unicast Mode
• Configuring PTP in Unicast Negotiation Mode
• PTP Boundary Clock
• Verifying PTP modes
• Verifying PTP Configuration on the 1588V2 Slave
• Verifying PTP Configuration on the 1588V2 Master
• PTP Hybrid Clock
• SSM and PTP Interaction
• ClockClass Mapping
• PTP Redundancy
• Configuring ToD on 1588V2 Slave
• Troubleshooting Tips
Restrictions
• Only unicast direct and unicast negotiation modes are supported. Multicast mode is not supported.
• PTP slave supports both single and two-step modes. PTP master supports only two-step mode.
• VLAN 4093 is used for internal PTP communication; do not use VLAN 4093 in your network.
• Loopback interface is used in Cisco ASR 901 router instead of ToP interface for configuring 1588
interface/IP address.
• The 1pps output command is not supported on master ordinary clock.
• Sync and Delay request rates should be above 32 pps. The optimum value is 64 pps.
• Clock-ports start as master even when they are configured as slave-only. The initial or reset state of
the clock is master. Therefore, the master clock must have higher priority (priority1, priority2) for
the slave to accept the master.