Cisco Active Network Abstraction Administrator’s Guide, 3.5
Page 88 Cisco Systems, Inc.
After Sheer DNA Manage installs and runs the process, samples the device
and collects the data a VNE (Managed Element) is created. The VNE
includes tables and physical inventory, and this Managed Element can be
accessed using Sheer NetworkVision.
6.7.1 VNE Status
The status of VNEs is affected by Admin and Oper mode. Admin mode is the
administrative instructions that are sent to the VNE. Oper mode is the actual
status of the VNE, for example, Up. For more information about Admin and
Oper modes, refer to page 89.
When moving a VNE, its status, for example, Up or Down, has a bearing on
whether the VNE is reloaded (Up) or not (Down). For more information
about moving VNEs, refer to page 105. For more information about starting
and stopping VNEs, refer to page 104.
A VNE can have only one of the following statuses at a time:
• Up: The VNE (process) is reachable and was loaded and started. When a
Start (command) option is issued, and no problems are encountered,
such as an overloaded server, the VNE is running (has been loaded and
started), and its status is Up.
• Down: The VNE (process) is reachable and was stopped. When a Stop
(command) option is issued, Sheer DNA issues instructions to shutdown
all of the processes. When all of the processes have been stopped, the
status of the VNE is Down.
• Unreachable: The VNE cannot be managed by Sheer DNA and its
status is defined as Unreachable. When an option (command) is issued
that cannot be executed by Sheer DNA, the status of the VNE is
Unreachable.
• Starting Up: When a Start or upload (command) option is issued, and
for example, the Server cannot execute it due to the fact that it is busy or
overloaded, the status of the VNE is Starting Up.
• Shutting Down: When a Stop (command) option is issued, and while
the command is being executed (some processes may still be running),
the status of the VNE is Shutting Down.
In addition to the statuses described, the VNE can be placed in maintenance
mode, for example, a VNE’s status can be Up and in maintenance mode. NEs
often undergo maintenance operations and planned outages. The Sheer DNA
platform supports such maintenance operations without affecting the overall
functionality of the active network.
