Cisco Systems A9014CFD manual Setting the TimeProperties, ASR901 Negotiation Mechanism, 22-46

Chapter 22 Configuring Clocking

Configuring PTP for the Cisco ASR 901 Router

		SESSION INFORMATION
SLAVE [Lo40] [Sessions 1]
Peer addr	Pkts in	Pkts out	In Errs	Out Errs
4.4.4.3	60023902	20011138	0	0

Setting the TimeProperties

The timeProperties dataset members (except timeTraceable and frequencyTraceable) can be individually set by using the time-propertiescommand.

Caution The time-propertiescommand does not perform any input validation; use this command with caution.

The following is an example of the time-properties command:

Router(config-ptp-clk)#time-properties atomic-clock timeScaleTRUE currentUtcOffsetValidTRUE leap59TRUE leap61FALSE 34

slave#show ptp clock dataset time-propertiesCLOCK [Ordinary Clock, domain 0]

Current UTC Offset Valid: TRUE

Current UTC Offset: 34

Leap 59: TRUE

Leap 61: FALSE

Time Traceable: TRUE

Frequency Traceable: TRUE

PTP Timescale: TRUE

Time Source: Atomic

The values of Time Traceable and Frequency Traceable are determined dynamically.

ASR901 Negotiation Mechanism

The Cisco ASR 901 router supports a maximum of 36 slaves, when configured as a negotiated 1588V2 master. For a slave to successfully negotiate with the Cisco ASR 901 master, it should request sync and announce packet rates that are not greater than the sync and announce rate that are currently set in the master.

For example, if the sync interval on the master is -5 (32 packets/second), and if the slave tries to negotiate a value of sync interval value of -6 (64 packets/second), the negotiation fails.

Static Unicast Mode

A clock destination can be added when the master is configured in the static unicast mode (by configuring the transport without the negotiation flag). The master does not communicate with any other slave, in this configuration.

Router(config-ptp-port)#clock destination 9.9.9.10

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
22-46	OL-23826-09