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  Working with VLANs
Figure 18-33 Links Between VLAN Elements and Devices
The key point is that a link between a VNE and EFP, switching entity, or network VLAN does not 
represent an association between the VNE and the logical element. Such a link is simply another view 
of the VLAN link.
If the thumbnail view is closed, instead of a link between the VNE and EFP, you will see a link between 
the VNE and the switching entity or network VLAN. 
Displaying VLANs By Applying VLAN Overlays to a Map
You can create an overlay of a specific VLAN on top of the physical network elements displayed in 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. 1The Ethernet topological link between port GigabitEthernet1/1/2 on VNE c7-sw10 and 
GigabitEthernet1/1/2 on VNE c7-sw8.
2The VLAN link between GigabitEthernet1/1/2@c7-sw10 EFP and GigabitEthernet1/1/2@c7-sw8 
EFP.
3Another view of the VLAN link (link 2), shown as a link between GigabitEthernet1/1/2@c7-sw10 
EFP and GigabitEthernet1/1/2@c7-sw8 EFP.
4Another view of the VLAN link (link 2), shown as a link between GigabitEthernet1/1/2@c7-sw10 
EFP and GigabitEthernet1/1/2@c7-sw8 EFP. 
						

							  
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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 that 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 1Display the network map for which you want to create an overlay in the Vision client. 
Step 2In the toolbar, choose Choose Overlay Type > VLAN.
Step 3In 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 overlay. 
The search condition is “contains.” Search strings are case-insensitive. For example, if you choose 
the Name category and enter “net,” the Vision client displays overlays that have “net” in their names. 
The string “net” can be at the beginning, middle, or end of the name, such as Ethernet. 
Choose Show All to view all overlays. 
Step 4Select an overlay, then click OK. 
The network elements and physical links used by the selected VLAN overlay are highlighted in the 
network map. All other network elements and links are dimmed. The VLAN name is displayed in the 
title of the window. See Figure 18-34.  
						

							  
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Figure 18-34 VLAN Overlay Example
NoteThe overlay is a snapshot taken at a specific point in time. As a result, the information in the overlay 
might become stale. To update the overlay, click Refresh the Last Selected Overlay in the toolbar.
The VLAN overlay service also supports multi-chassis devices. If a network element in the overlay is 
dimmed, then all the hosts of the network element along with the Inter Rack Links (IRL) and the Inter 
Chassis Links (ICL) used for transportation will also be dimmed. Apart from these, the chassis that holds 
the configured port will also be dimmed. 
Displaying or Hiding VLAN Overlays
After you create a VLAN overlay, you can hide it by clicking Hide Overlay in the toolbar. All previously 
dimmed network elements and links are displayed. To display the overlay, click Show Overlay. 
NoteThe Overlay icon toggles between Show Overlay and Hide Overlay. When selected, the VLAN overlay 
is displayed and the Hide Overlay tool is active. When deselected, the VLAN overlay is hidden and the 
Show Overlay tool is active.
Removing a VLAN Overlay
To remove a VLAN overlay from a map, choose Choose Overlay Type > None in the toolbar. The 
overlay is removed from the map, and the Show Overlay/Hide Overlay icon is dimmed. 
						

							  
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Viewing VLAN Service Link Properties
See the following topics for information on viewing VLAN service link properties:
Viewing REP Properties for VLAN Service Links, page 18-81
Viewing STP Properties for VLAN Service Links, page 18-84
Viewing Associated Network VLAN Service Links and VLAN Mapping Properties, page 18-74
Viewing REP Information in VLAN Domain Views and VLAN Overlays
You can view REP segment and port information in the Vision client in the map view. The icons 
displayed depend on whether you view the REP information in the VLAN domain view or in a VLAN 
overlay. Table 18-35 describes the icons and badges used to represent REP segment and port 
information.
Table 18-35 REP Icons and Badges in VLAN Domain Views and Overlays
Item Description VLAN Domain View VLAN Overlay
REP identifier—Uses the 
format REP-id where id 
represents the REP segment 
identifier.
The REP identifier is displayed in 
the domain view if the visual link 
represents only one link.
f the visual link represents more 
than one link, no REP identifier is 
displayed. The REP identifier is displayed in a 
VLAN overlay view if all the links 
represented by the visual link are 
from the same source to the same 
destination. 
REP No Neighbor 
segment— Indicates that 
the specified segment has 
no neighbor.
REP identifier for incorrect 
configuration—Indicates 
that the two sides of the link 
are configured differently 
or incorrectly. 
						

							  
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Viewing REP Properties for VLAN Service Links
To view REP properties for a VLAN service link, open the Link Properties window in either of the 
following ways: 
Double-click the VLAN service link.
Right-click the VLAN service link, and choose Properties. 
Figure 18-35 shows an example of the Link Properties window with REP information. Multiple links with badges 
icon—Indicates that one or 
more link is represented by 
the visual link and at least 
one of the links contains a 
badge. The multiple links icon is displayed 
in the domain view if more than one 
link is represented by the visual link 
and at least one of the links contains 
a badge. The multiple links icon is displayed 
in a VLAN overlay view if either of 
the following is true:
More than one link is 
represented by the visual link 
and the links have different 
sources or destinations. 
A badge or REP identifier exists 
on a sublink.
REP primary 
badge—Indicates a REP 
primary port. 
Blocking badge—Indicates 
a REP alternate port. 
Primary and blocking 
badge—Indicates a REP 
primary port that is also 
blocking. 
Table 18-35 REP Icons and Badges in VLAN Domain Views and Overlays (continued)
Item Description VLAN Domain View VLAN Overlay 
						

							  
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Figure 18-35 VLAN Service Link Properties Window with REP Information 
Table 18-36 describes the information that is displayed for REP for each end of the link.
Table 18-36 REP Properties in VLAN Service Link Properties Window
Field Description
Segment ID REP segment identifier.
Port Type Port type: Primary Edge, Secondary Edge, or Intermediate. 
Port Role Role or state of the REP port depending on its link status and 
whether it is forwarding or blocking traffic: Failed, Alternate, or 
Open. 
Port Status Operational link state of the REP port: None, Init Down, No 
Neighbor, One Way, Two Way, Flapping, Wait, or Unknown.  
						

							  
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Viewing STP Information in VLAN Domain Views and VLAN Overlays
You can view STP segment and port information in the Vision client in the map view. The icons 
displayed depend on whether you view the STP information in the VLAN domain view or in a VLAN 
overlay. Table 18-37 describes the icons and badges used to represent STP link and port information.
To view additional STP information in a VLAN overlay, right-click an STP link and choose Show 
Callouts. The following STP port information is displayed as shown in Figure 18-36:
Port name
Port role
Port state
Figure 18-36 STP Link Information in a VLAN Overlay Table 18-37 STP Information in VLAN Domain Views and Overlays
Item Description VLAN Domain View VLAN Overlay
The STP root bridge, or root of the STP 
tree, is indicated by an uppercase R. 
An STP root port is the port at the root of 
the STP tree. Each switching entity in the 
network VLAN should have a port 
designated as the root port. 
The STP root port is indicated by an 
uppercase R on the Ethernet flow point 
that is designated the root port.
STP blocks some VLAN ports to ensure a 
loop-free topology. The blocked port is 
marked with a red deny badge on the side 
on which traffic is denied.  
						

							  
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Viewing STP Properties for VLAN Service Links
To view STP properties for a VLAN service link, open the Link Properties window in one of the 
following ways: 
Double-click the VLAN service link.
Right-click the VLAN service link, and choose Properties. 
Figure 18-37 shows an example of the Link Properties window with STP information. 
Figure 18-37 STP Properties in VLAN Service Link Properties Window
Table 18-38 describes the information that is displayed for STP for the VLAN service link. 
Table 18-38 STP Properties in VLAN Service Link Properties Window
Field Description
Port State STP port state: Disabled, Blocking, Listening, Learning, or 
Forwarding, 
Port  Role STP port role: Unknown, Backup, Alternative, Designated, Root, or 
Boundary.  
						

							  
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Viewing VLAN Trunk Group Properties
VTP is a Layer 2 multicast messaging protocol that manages the addition, deletion, and renaming of 
VLANs on a switched network-wide basis. 
The Vision client displays VTP information in the logical inventory. VTP information is shown only for 
Cisco devices that support VTP, and support is provided only for VTP Version 1 and 2. Support for 
Version 3 is limited to the additional attributes that are supported by the version, such as primary and 
secondary server. No support is provided for the display of VTP information at the port (trunk) level.
The Vision client shows all VTP modes: Server, Client, Transparent, and Off. For each mode, the Vision 
client displays the relevant mode information such as VTP domain, VTP mode, VTP version, VLAN 
trunks, and the trunk encapsulation. The Vision client also displays VTP domain information in a view 
that includes a list of all switches that are related to these domains, their roles (server, client, and so on), 
and their VTP properties.
To view VTP properties: 
Step 1In the Vision client, choose Network Inventory > VTP Domains.
Step 2Double-click the VTP domain you want to view.
The VTP Domain Properties window is displayed as shown in Figure 18-38.
Figure 18-38 VTP Domain Properties Window in Logical Inventory 
						

							  
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Table 18-39 describes the information that is displayed in the VTP Domain Properties window. 
Step 3To view the VTP properties at the device, double-click the VTP domain. 
Table 18-40 describes the VTP information that is displayed in the inventory window content pane. 
Table 18-39 VTP Domain Properties Window
Field Description
Managed Element Managed element name, hyperlinked to VTP in logical inventory.
Operating Mode VTP operating mode:
Server—Allows VLAN creation, modification, and deletion, and 
specification of other configuration parameters for the entire VTP 
domain. Server is the default mode. 
Client—Same behavior as VTP server, except VLANs cannot be 
created, changed, or deleted.
Transparent—The device does not participate in the VTP. The 
device does not advertise its VLAN configuration and does not 
synchronize its VLAN configuration based on received 
advertisements. 
However, the device forwards received VTP advertisements out of 
their trunk ports in VTP Version 2. 
Off—The device does not participate in VTP and does not forward 
VTP advertisements.
Process Status Status of the VTP process: Running or Disabled.
Authentication Enabled Whether or not VTP authentication is enabled: True or False. 
Authentication ensures authentication and integrity of switch-to-switch 
VTP messages. VTP Version 3 introduces an additional mechanism to 
authenticate the primary VTP server as the only device allowed to 
change the VLAN configuration on a network-wide basis.
Configuration Revision 32-bit number that indicates the level of revision for a VTP packet.
Each VTP device tracks the VTP configuration revision number that is 
assigned to it. Most VTP packets contain the VTP configuration revision 
number of the sender.
Version VTP version: 1, 2, or 3.
Table 18-40 VTP Properties in Inventory
Field Description
Operating Mode VTP operating mode: Server, Client, Transparent, or Off.
Domain Name VTP domain name.
Version VTP version: 1, 2, or 3.
Pruning Whether or not VTP pruning is enabled: True or False. 
VTP pruning increases available bandwidth by restricting flooded traffic 
to those trunk links that the traffic must use to access the appropriate 
network devices.