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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
ptp clock ordinary domain 20 hybrid
time-properties gps timeScaleTRUE currentUtcOffsetValidTRUE leap59FALSE leap61FALSE 35
clock-port SLAVE slave
transport ipv4 unicast interface Lo17
clock source 17.17.1.1
Use the show ptp clock running domain command to display the sample output.
Router# show ptp clock running domain
PTP Ordinary Clock [Domain 20] [Hybrid]
State Ports Pkts sent Pkts rcvd Redundancy Mode
PHASE_ALIGNED 1 27132197 81606642 Track all
PORT SUMMARY
PTP Master
Name Tx Mode Role Transport State Sessions Port Addr
SLAVE unicast slave Lo17 Slave 1 17.17.1.1
Use the show platform ptp channel_status command to display the sample output after PTP is in
normal state.
Router#show platform ptp channel_status
Configured channels : 2
channel[0]: type=0, source=0, frequency=0, tod_index=0, freq_prio=5
time_enabled=y, freq_enabled=y, time_prio=1 freq_assumed_QL=0
time_assumed_ql=0, assumed_ql_enabled=n
channel[1]: type=6, source=17, frequency=0, tod_index=0, freq_prio=2
time_enabled=n, freq_enabled=y, time_prio=0 freq_assumed_QL=0
time_assumed_ql=0, assumed_ql_enabled=n
Channel 0: Frequency Time
---------------------------------------
Status OK OK
Weight 0 100
QL 9 9
---------------------------------------
QL is not read externally. Fault status: 00000000
Channel 1: Frequency Time
---------------------------------------
Status OK Disabled
Weight 100 0
QL 9 9
---------------------------------------
QL is not read externally. Fault status: 00000000
SSM and PTP Interaction
PTP carries clock quality in its datasets in the structure defined by the IEEE 1588 specification. The
Ordinary Clock (OC) master carries the Grand Master (GM) clock quality in its default dataset which is
sent to the downstream OC slaves and Boundary Clocks (BC). The OC slaves and BCs keep the GM
clock quality in their parent datasets.