Cisco Systems A9014CFD manual Configuring PTP in Unicast Mode, Port Name, Port Role, 22-25

Chapter 22 Configuring Clocking

Configuring PTP for the Cisco ASR 901 Router

Configuring PTP in Unicast Mode

In unicast mode, the slave port and the master port need to know each other’s IP address. Unicast mode has one to one mapping between the slave and the master. One master can have just one slave and vice-versa. Unicast mode is not a good option for scalability.

The command used for configuring Cisco ASR 901 on unicast mode is clock-port.

Command	Purpose
Router(config-ptp-clk)# clock-port	Configures Cisco ASR 901 on unicast mode. The
	following options can be configured with this
	command:
	•	Port Name
	•	Port Role

Before configuring Cisco ASR 901 on different modes, you need to configure the loopback address. The following example shows the configuration of loopback address:

Note This loopback address cannot be used for any protocol other than PTP.

Router(config)#int loopback

Router(config-if)#ip address 8.8.8.2 255.255.255.255

Router(config-if)#no sh

Router#sh run int loopback

Building configuration...

Current configuration : 72 bytes

!

interface loopback

ip address 8.8.8.2 255.255.255.255 end

!

Note Ensure that this loopback interface is reachable (using ICMP ping) from remote locations, before assigning the interface to PTP. Once the interface is assigned to PTP, it does not respond to ICMP pings.

The following example shows the configuration of Cisco ASR 901 on the unicast mode:

Router# configure terminal

Router(config)# ptp clock ordinary domain 0

Router(config-ptp-clk) clock-port SLAVE slave

Router(config-ptp-port)#transport ipv4 unicast interface loopback 10

Router(config-ptp-port)# clock-source 8.8.8.1

Configuring PTP in Unicast Negotiation Mode

In unicast negotiation mode, master port does not know the slave port at the outset. Slave port sends negotiation TLV when active and master port figures out that there is some slave port for synchronization. Unicast negotiation mode is a good option for scalability as one master has multiple slaves.

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		22-25