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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
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Chapter 22 Configuring Clocking
Configuring PTP for the Cisco ASR 901 Router
PTP Hybrid Clock
To improve the clock quality, you can either improve the oscillator class or reduce the number of hops
between the master and the slave. In PTP hybrid mode, the oscillator class is improved by using a
physical layer clock (sourced from a stratum-1 clock) instead of the available internal oscillator. The
PTP hybrid mode is supported for ordinary clock (in slave mode only) and boundary clock.
Configuring a Hybrid Ordinary Clock
Complete the following steps to configure a hybrid clocking in ordinary slave clock mode:
Prerequisites
When configuring a hybrid clock, ensure that the frequency and phase sources are traceable to the same
master clock.
Restrictions
• Hybrid mode is not supported when PTP ordinary clock is in the master mode.
• Hybrid clock is not supported with ToP as network-clock. It needs a valid physical clock source, for
example, Sync-E/BITS/10M/TDM.
SUMMARY STEPS
1. enable
2. configure terminal
3. ptp clock ordinary domain domain [hybrid]
4. clock-port port-name slave
5. transport ipv4 unicast interface interface-type interface-number
6. clock source source-address
7. announce timeout value
8. delay-req interval interval
9. sync interval interval
10. end