Cisco Systems OL-7396-01 Configuring Network Clocking with NCDP

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ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter3 Initially Configuring the ATMSw itch Router
Configuring Network Clocking
The following example shows the switch clock source configuration with the n etwork clock module
installed:
Switch# show network-clocks
Network clocking information:
---------------------------------------
Source switchover mode: revertive
Netclkd state: Active
Source selection method: provisioned
NCLKM hardware status: installed & usable
NCLKM status: software enabled
Primary clock source: ATM0/0/0
Secondary clock source: not configured
Present clock source: NCLKM Stratum 3 osc (0)
The following example shows the clock source configuration stored in the running configuration:
Switch# more system:running-config
!
<information deleted>
!
network-clock-select revertive
network-clock-select 1 ATM0/0/0
<information deleted>
Configuring Network Clocking with NCDP
The Network Clock Distribution Protocol (NCDP) provides a means by which a network can
synchronize automatically to a primary reference source ( PRS). To do so, NCDP constructs and
maintains a spanning network clock distribution tree. This tree structure is superimposed on the network
nodes by the software, resulting in an efficient, synchronized network suitable for transport of traffic
with inherent synchronization requirements, such as voice and video.
The following sections provide instructions for configuring NCDP. For a description of how NCDP
works, refer to the Guide to ATM Technology.
Note The NCDP is intended for use on ATM switch routers equipped with FC-PFQ or with the network clock
module.