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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
Note The hybrid clock (HC) relies on an external clock source for frequency recovery while phase is recovered
through PTP. Once the HC reaches the normal or phase aligned state, and if the external frequency
channel is active and traceable to PRC, then the HC moves into the phase aligned state even when the
PTP link is down.
Verifying Hybrid modes
Use the show running-config | section ptp command to display the sample output.
Router# show running-config | section ptp
Step 4
clock-port
port-name
slave
Example:
Router(config-ptp-clk)# clock-port
SLAVE slave
Sets the clock port to PTP slave mode and enters the clock
port configuration mode. In slave mode, the port exchanges
timing packets with a PTP master clock.
Step 5
transport ipv4 unicast interface
interface-type
interface-number
[negotiation]
Example:
Router(config-ptp-port)# transport
ipv4 unicast interface Loopback 0
negotiation
Sets port transport parameters.
• interface-type—The type of the interface.
• interface-number—The number of the interface.
• negotiation—(Optional) Enables dynamic discovery
of slave devices and their preferred format for sync
interval and announce interval messages.
Step 6
clock source
source-address
Example:
Router(config-ptp-port)# clock
source 133.133.133.133
Specifies the address of a PTP master clock.
Step 7
clock-port
port-name
master
Example:
Router(config-ptp-port)# clock-port
Master master
Sets the clock port to PTP master mode. In master mode,
the port exchanges timing packets with PTP slave devices.
Note The master clock-port does not establish a clocking
session until the slave clock-port is phase aligned.
Step 8
transport ipv4 unicast interface
interface-type
interface-number
[negotiation]
Example:
Router(config-ptp-port)# transport
ipv4 unicast interface Loopback 1
negotiation
Sets port transport parameters.
• interface-type—The type of the interface.
• interface-number—The number of the interface.
• negotiation—(Optional) Enables dynamic discovery
of slave devices and their preferred format for sync
interval and announce interval messages.
Step 9
exit
Example:
Router(config-ptp-port)# exit
Exits clock port configuration mode.
Command or Action Purpose