Cisco PXM Version 1.1 User's Guide download pdf (Page 96)

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Cisco Media Gateway Manager 5.0 User Guide

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Chapter 4 Building the Network

How Do I Synchronize the Network?

4.6.1 Discovering NEs

The network discovery service in Cisco MGM collects information from individual NEs, discovers new

NEs added to the network, and computes network-level information, such as physical topology, and

discrepancies.

When you add a new NE to Cisco MGM, the discovery process starts. When the process finishes, all of

the NE information (such as inventory, configuration, physical topology, and discrepancies) is collected

and Cisco MGM is updated.

4.7 How Do I Synchronize the Network?

The Cisco MGM server and managed nodes must be synchronized with the same date and time. If the

Cisco MGM server and managed nodes do not have the same date and time, there might be

inconsistencies in retrieving time-sensitive data.

This section contains the following information:

• 4.7.1 Viewing Clocking Sources

4.7.1 Viewing Clocking Sources

Cisco MGM supports manual clock configuration. This configures both a primary and secondary clock

source, which are distributed throughout the network. The secondary clock source takes over if the

primary clock source fails. You can configure a network setup with one master clock source, and a

secondary to ensure network clock stability.

On Cisco MGX 8850 (PXM45) switches, clock source configuration is done on a PXM45 card, and clock

sourcing information is passed to other nodes over AXSM lines.

Clock synchronization is done directly on the Cisco MGM8880 using the CLI.

These topics are used to manage and configure clocking sources:

• 4.7.1.1 Configuring Global Clocking

• 4.7.1.2 Displaying the List of Available Clock Sources

• 4.7.1.3 Displaying the List of Manual Clock Sources

• 4.7.1.4 Creating a Manual Clock Source

4.7.1.1 Configuring Global Clocking

To configure global clocking:

Step 1 In the Domain Explorer Hierarchy pane, right-click the node and choose Configuration >

MGX8880/8850 MGX > Configuration Center.

Step 2 Drag and drop the node from the Hierarchy pane to the right hand pane.

Step 3 Click the Elements tab to display the Configuration Window for Elements.

Step 4 Click the Clocking tab to display Global Clocking Configuration window. See Figure 4-3.

Step 5 Choose Global Clocking Configuration from the Category drop-down arrow.

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