Network Synchronization
262 Basic System Configuration Guide
Figure 15: Peer Clocks
For multicast Ethernet operation, the router shall listen for and transmit PTP messages using
the configured multicast MAC address. Neighbor clocks are discovered via the reception of
messages through an enabled Ethernet port. An ordinary clock master, ordinary clock slave,
and a boundary clock support more than one neighbor PTP clock connecting into a single
port. This might be encountered with the deployment of an Ethernet multicast LAN segment
between the local clock and the neighbor PTP ports using an End to end transparent clock or
an Ethernet switch. The Ethernet switch is not recommended due to the introduction of PDV
and the potential degradation of performance but it can be used if appropriate to the
application. Figure 16 shows the relationship of various neighbor clocks using multicast
Ethernet sessions to a 7750 SR configured as a boundary clock. The 7750 SR has three ports
configured for multicast Ethernet communications. Port 1/2/1 of the 7750 SR shows a
connection where there are two neighbor clocks connecting to one port of the 7750 SR
through an end-to-end transparent clock.
Boundary Clock
10.3.1.1
Ordinary Clock
Slave
10.1.1.1
Ordinary Clock
Master
10.3.1.1
Ordinary Clock
Slave
10.2.1.1
7750 S
Boundary Clock
10.0.1.1
Peer 10.3.1.1
Peer 10.0.0.1
Configured Peers
Discovered Peers
OSSG736
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