HP Network Direr Software Products manual Undiscovered Subnets, Subnet Icon’s Name

170CHAPTER 5: WORKING WITH THE MAP

between subnets and routers or layer-3 switches are shown as physical links. For more information see “Navigating Between Submaps and the Top-Level Map” on page 184.

If a router or layer-3 switch in your network has two or more IP interfaces configured on a single port then the subnets that those IP interfaces belong to will be grouped together into a single submap. This helps represent the fact that these subnets exist on the same physical LAN segment. Such a configuration is sometimes known as "one-armed routing".

In such a case the submap will contain the devices in all associated IP subnets. The subnet icon’s name will include all of the IP subnets that it represents:

Figure 58 Subnet Icon’s Name

Undiscovered Subnets

If 3Com Network Director discovers a device that has an IP interface on a subnet that 3Com Network Director has not recognized, then an undiscovered subnet icon will be added to the top-level map and linked to the device. Undiscovered subnet icons represent areas of the network that have not yet been discovered by 3Com Network Director, and give you a convenient way to visualize and progressively map your entire network. Double-clicking on an undiscovered subnet allows you to launch a Network Discovery operation against the IP subnets represented by the Undiscovered subnet icon. For more information about network discovery see “Discovering the Network” on page 91.

If you do not wish to see the undiscovered subnets in your top-level map then turn off the View > Show Undiscovered Subnets option. This will simplify the contents of your map by hiding all of the undiscovered subnets. If you turn off this option then you may also wish to relayout your map. For more information see “Modifying the Map Layout” on page 200.