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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
The ASR 901 PTP boundary clock has the following capabilities:
• Support for up to 20 clock ports.
• Simultaneous support for static and negotiated clock ports.
• Support for up to 36 slaves and 1 master.
Note If all clock ports created in PTP boundary clock are static, Cisco ASR 901 supports only
1 master port and 19 slave ports. However, if one or more slave ports are configured in unicast
negotiation mode, Cisco ASR 901 can support up to 36 slaves.
• Support for dynamic addition and deletion of clock ports. This capability is supported only on
boundary clock master ports.
• Support for selecting boundary clock as the clock source.
Configuring PTP Boundary Clock
Complete the following steps to configure the PTP boundary clock.
Prerequisites
• Install the 1588BC license before configuring the PTP boundary clock. For more information on
installing the license, see “Installing the License” section on page 2-11.
Note If PTP boundary clock is configured before installing the 1588BC license, remove the boundary
clock configuration and reconfigure the boundary clock after the license installation.
• Configure a different loopback address for each PTP master or slave port before configuring the PTP
boundary clock. For more information on configuring loopback address, see “Configuring PTP in
Unicast Mode” section on page 22-25.
Restrictions
• The loopback address configured for PTP port can be used only for PTP functionality.
• The loopback address configured for PTP port does not respond to pings.
• A clock port once configured as master cannot change to slave dynamically, and vice versa.
• PTP boundary clock can be configured for only one domain.
SUMMARY STEPS
1. enable
2. configure terminal
3. ptp clock boundary domain domain
4. clock-port port-name slave
5. transport ipv4 unicast interface interface-type interface-number [negotiation]
6. clock source source-address
7. clock-port port-name master