Definition

Node management on the U2000 includes subnet management and NE management.

Benefits

The physical root view intuitively shows service relationships between network-wide NEs in terms of functional services by using NEs, links, and subnets.

Subnet

On the U2000, a large network can be divided into several smaller networks based on a specific rule (for example, by region), for the convenience of network management. On the U2000, these smaller networks are called subnets. Subnets are located in the physical view and custom view.

l  A subnet is created only to simplify the user interface and has no impact on the NEs.

l  Common subnets are created in thePhysical RootorClock View. Logical subnets are created in theCustom view.

l  The NMS supports the creation of a maximum of 20 layers of subnets.

 NE

NEs are used to identify concrete entity devices, such as switches and routers.

l  NE can be grouped into physical NEs and virtual NEs based on whether they communicate with the U2000 actually or abstractly.

−      Physical NEs: These NEs are directly managed by the U2000.

−      Virtual NEs:

−      A virtual NE is an abstraction of an NE or a network that cannot be directly managed by the U2000. If an NE that is not managed by the U2000 exists in the network and there are trails created on the NE, the equipment can be represented by creating a virtual NE on the U2000. Virtual NEs represent the topological relationships between NEs that the U2000 manages directly and the equipment the U2000 manages indirectly on the topology.

−      Currently, virtual NE concept applies to just the SDH series and PTN series NEs, and the virtual NEs can only simulate the SDH NE features.

−      Different from actual NEs, a virtual NE does not need to be hardware-specific. It can be used to represent any unknown equipment. On the U2000, it is usually used to simulate the equipment that cannot be directly managed by the U2000, such as the third-party equipment.

−      You can customize the boards in a virtual NE on the U2000. The process of creating and deleting a virtual NE is similar to that of an actual NE.

−      Virtual NEs are not restricted by the license. The license does not define the maximum number of virtual NEs on the U2000. Virtual NEs, however, occupy CPU and memory resources, decreasing the management capacity of the U2000.

l  NEs can be grouped into gateway NEs and non-gateway NEs based on whether they communicate with the U2000 directly through the network.

The U2000 communicates with the NEs through the network to manage the network NE. This type of NE that communicates directly with the U2000 through the network is called gateway NE (GNE). The other NEs that communicate with the U2000 through the GNE are called non-gateway NEs.

The GNE and non-gateway NE concept applies to the MSTP series, WDM series, WDM (NA) series, RTN series, PTN series and marine series NEsRTN series NEs.

−      GNE

−      The U2000 manages the network NE through the GNE. The communication protocol of GNE is IP or OSI.

−      Each U2000 must connect to at least one GNE. NEs that directly communicate with the U2000 are GNEs.

−      If the number of non-gateway NEs that connect to a GNE is more than 50, an alarm is reported to the U2000.

−      Non-Gateway NE

−      The non-gateway NE communicates with the GNE by using the ECC or the extended ECC. Therefore, it can communicate with the U2000.

−      The recommended number of non-gateway NEs (including non-gateway NEs that connect to the GNE by using the extended ECC) that connect to each GNE is fewer than 50.

l  Optical NE

−      An optical NE represents a type of WDM series NEs, for example, OTM. The WDM series NEs belong to an optical NE and each optical NE can contain multiple WDM series NEs. The optical NE concept applies to the WDM series NEs only.

−      Optical Network Element (ONE) is the transport entity that implements the NE functions (terminal multiplexing, add/drop multiplexing, cross-connection and regeneration) in a DWDM layer network.

−      The locating of an ONE is equivalent to that of a common NE. In a view, an ONE is displayed with an icon, like a common NE and its alarm status can be displayed with colors. Logically, an ONE consists of different subracks.

−      As an NE, an ONE cannot be expanded or entered like a sub-network. Similar to a common NE, an ONE provides a list of the subracks that form the NE to display the board layout.

−      The U2000 manages the WDM series NEs by means of optical NEs. The WDM series NEs is no longer referred to as NE, but as a subrack. The SDH series NEs has only one subrack. Hence, the NE layer does not need to be distinguished from the subrack layer.

−      There are four types of optical NEs, which are WDM_OTM, WDM_OLA, WDM_OADM and WDM_OEQ.

Currently, the OptiX OSN 1800, OptiX OSN 1832, OptiX OSN 6800, OptiX OSN 8800 series, OptiX OSN 9800 series NE can be managed both separately as an NE and in an optical NE.