Cisco Catalyst 8540 MSR Technical Information download pdf (Page 14)

Chapter 3 Initially Configuring the ATM Switch Router

Configuring Network Clocking

3-14

ATM Switch Router Software Configuration Guide

78-6277-03, Cisco IOS Release 12.0(13)W5(19)

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.

NCDP Network Example

Figure 3-1 shows a network of six ATM switch routers with clocking derived from a stratum 3 PRS.

Node A is configured to receive priority 1 clocking on two of its ports, while node B is configured to

receive priority 2 clocking on one of its ports.

Figure 3-1 Network Conﬁguration for NCDP

Priority 1

Stratum 3

C D

A B

Priority 2

Stratum 3

PRS

source

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Cisco Catalyst 8540 MSR Technical Information Page 14