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Chapter 12 Monitoring Carrier Ethernet Services Working with VLANs
Displaying VLANs By Applying VLAN Overlays to a Map45
You can create an overlay of a specific VLAN on top of the physical network elements d i splay ed i n a
map view. The overlay highlights the network elements and links that the selected VLAN and its
associated VLANs traverse. Network elements and links that are not part of the VLAN are dimmed in
the map view.
The VLAN overlay is a snapshot of the network to help you visualize the network elements and links
connected to a VLAN. The overlay displays STP and REP link and port information.
If you select a network VLAN that is associated with other VLANs, the associated VLANs are included
in the overlay.
The VLAN service overlay allows you to isolate the parts of a network tha t are being used by a particular
service. This information can then be used for troubleshooting. For example, the overlay can highlight
configuration or design problems when bottlenecks occur and all site interconnections use the same link.

Adding a VLAN Overlay

To add a VLAN overlay:
Step 1 Display the network map for which you want to create an overlay in Prime Network Vision.
Step 2 In the toolbar, choose Choose Overlay Type > VLAN.
Step 3 In the Select VLAN Overlay dialog box, do either of the following:
• Choose a search category, enter a search string, then click Go to narrow the selection to a set of
overlays or a specific overl ay.
The search condition is “contains.” Search strings are case-insensitive. For example, if you choose
the Name category and enter “net,” Prime Network Vis ion displa ys ov e rlay s that ha v e “net” in their
names. The string “net” can be at the beginning, middle, or end of the na me, su ch as E the rne t.
• Choose Show All to view all overlays.
Step 4 Select an overlay, then click OK.
The network elements and physical links used by the selected VLAN overlay are highlighted in th e
network map. All other network elements and links are dim med. T he V L AN name is di spla yed i n t he
title of the window. See Figure 12-33.