Cisco Systems 78-16845-01 manual Discovering CTC-Based NEs, Discovering ONS 155xx NEs, 3-51

Chapter 3 Building the Network

3.8.1 Discovering CTC-Based NEs

Note The Discovered Network Elements group can be viewed only by users who have all NEs assigned to them. Therefore, in the Add New NE wizard, the grouping option “Group discovered NEs in the Discovered Network Elements Group” is not available.

3.8.1 Discovering CTC-Based NEs

When a CTC-based NE is added as a GNE, all NEs that are DCC-connected to the GNE are automatically discovered. The discovered NEs are added automatically to CTM. The location of the new NE depends on what you set up in the discovery wizard.

3.8.2 Discovering ONS 155xx NEs

When you add a new ONS 155xx NE to CTM, the discovery process starts. When the process finishes, all of the NE information (such as inventory, configuration, physical topology, logical circuits, and discrepancies) is collected and CTM is updated. In addition, neighbors of the added NE are discovered. To discover new neighbors, the discovery service relies on CDP neighbor information and topology neighbor information obtained from NEs.

The CTM ONS 155xx discovery service uses the following measures to keep the NE and network information in CTM synchronized with the NEs themselves:

•Periodic rediscovery based on the resync interval. Periodic rediscovery brings the information in CTM up to date for all ONS 155xx NEs in the network and rediscovers any new neighbors. The resync interval can be viewed and reset in the Control Panel. (For information about resetting the resync interval, see 3.8.4 Resetting the Resync Interval, page 3-53.) If at least one ONS 155xx is already in the system, the first periodic rediscovery starts when the ONS 155xx NE service starts. The NE service usually starts when the CTM server is restarted. If no ONS 155xx NEs are in the system when CTM restarts, the first periodic discovery starts when the first ONS 155xx is added.

•Event-triggered rediscovery launched by certain changes to ONS 155xx NEs. Event-triggered discovery incrementally updates CTM with the new information. New neighbors of the affected NE are discovered. The device changes that trigger rediscovery include, but are not limited to, the following: reboot, CPU switchover, patch and topology changes, and insertion and removal of physical components.

•User-requested rediscovery. Users can request rediscovery of selected ONS 155xx NEs or the entire ONS 155xx network at any time. This updates CTM with information about the NEs. For more information about using rediscovery commands, see 3.8.3 Rediscovering ONS 155xx, CRS-1, and XR 12000 NEs, page 3-52.

Note Only active NEs (NEs that are in the In Service or Under Maintenance states) can participate in the rediscovery process.

3.8.2.1 Discovery Information Table

The Discovery Information table displays discovery information for both individual devices for the main discovery. The main discovery includes the discovery of individual devices plus network-level computations for topology, discrepancies, and logical circuits. The Discovery Information table shows

Cisco Transport Manager Release 6.0 User Guide

78-16845-01 3-51