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Cisco Transport Manager Release 6.0 User Guide
78-16845-01
Chapter 3 Building the Network
3.9.1 Discovering NEs
3.9.1 Discovering NEs
The network discovery service in CTM 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 CTM, the discovery process starts. When the process finishes, all of the NE
information (such as inventory, configuration, physical topology, and discrepancies) is collected and
CTM is updated.
3.10 How Do ISynchronize the Network for Optical and Routing
Devices?
Use the NE Explorer to synchronize the CTC-based NEs in your network. The following sections
describe the synchronization settings in detail.
3.10.1 Synchronization Settings for the ONS 15310, ONS 15327, ONS 15454
SONET, and ONS 15600 SONET
Full Cisco IOS configuration synchronization is performed automatically by CTM to keep the NE and
the CTM Data Provisioning Service synchronized. Full configuration resynchronization might be
delayed depending on the usage of the CTM server.
For more information, see Chapter 7, “Provisioning Services and Connections.”
Synchronization status messaging (SSM) is a SONET protocol that communicates information about the
quality of the timing source. SSM messages are carried on the S1 byte of the SONET Line layer. These
messages enable SONET devices to automatically select the highest quality timing reference and to
avoid timing loops.
SSM messages are either Generation 1 or Generation 2. Generation 1 is the first and most widely
deployed SSM message set. Generation 2 is a newer version. If SSM is enabled, consult the timing
reference documentation to determine which message set to use. Table 3-18 and Table 3-19 show the
Generation 1 and Generation 2 message sets.
Table 3-18 SSM Generation 1 Message Set
Message Quality Description
PRS 1 Primary reference source—Stratum 1
STU 2 Synchronization traceability unknown
ST2 3 Stratum 2
ST3 4 Stratum 3
SMC 5 SONET minimum clock
ST4 6 Stratum 4
DUS 7 Do not use for timing synchronization
RES — Reserved; quality level set by user