While you attach, detach,
or edit an L2 Service Extension, L3 Service Extension, or Device template Cisco
VTS requires you to preview the template configuration before you proceed with
the desired action.
The Preview Config
button displays the Preview Config Summary popup, which displays the
configuration difference that will be pushed on each device. It also shows the
timestamp at which the preview was run. The Change Summary gives a count of the
number of configuration additions and deletions.
that is added to the device is shown in Green. The configuration that is
removed is shown in Red. A
- sign shows
the additions and deletions respectively. You can click the
> icon to get a preview of the configuration.
Summary shows the configuration difference for all devices, including devices
to which the template was previously attached. Devices to which the template
has already been attached will be preselected and grayed out.
The Red out of
sync icon indicates that the device is not in sync with the VTS database. You
will not be able to attach, detach, or edit a template to the device, if the
device is out of sync. You can perform the attach, detach, and edit operations
only on those devices which are in sync with the VTS database (as indicated by
the Green icon). However, you can still view the configuration difference with
the current VTS database, using the drop-down arrow.
You either need to
go back and deselect the out of sync device, or you need to go to Network
Inventory and sync the device to VTS. Out of sync devices can be synched in
deselect a device to which the template was previously attached, if the device
is currently out of sync with VTS. This is because the UI does not allow you to
deselect a device to which the template was already attached. You need to go to
Network Inventory and sync the device with VTS before you proceed.
To preview the
template configuration while you edit a template, at least one device should be
attached to the template before you edit the template. Otherwise, the option to
preview is grayed out.
When you detach a
template from a device, the Preview Config Summary shows the configuration
difference, which includes the configuration that will be removed from the
device upon template detachment, and the additional configuration that Cisco
VTS adds to the device.
Preview Template Configuration Examples
to see examples of preview config summary for an attach, detach, and edit
If the template
application creates no change in the device configuration, the preview displays
For L2 Service
Extension template, while you attach the template, the configuration summary
shows the port configuration and the device configuration. If you have not
created ports on a device during network creation, the summary will be shown as
No difference for that device. This because the template configuration does not
get pushed to the device unless you do a port attach.
For L3 Service
Extension templates, the configuration summary shows the interface
configuration and device configuration. If an interface is not attached to the
Router, the configuration summary will be shown as No difference.
conditions, for instance, when the commands in the template are invalid, or if
the feature is not supported by the device, the summary displays errors.