Policy needs. Span Groups aid in Span management, much as trunk groups are used for trunk management.
Before you can install Policies on Spans, you must place the Spans into one or more Span Groups. Policies are installed on Span Groups rather than on individual Spans. However, a Span Group may contain only a single Span if appropriate. Only one Policy of each type can be installed on a Span Group.
When you move a Span into an existing Span Group on which user-defined Policies are already installed, the Span automatically receives and begins enforcing those Policies as follows:
• The system checks to see whether all installed Policies will fit on the Span. If all policies do not fit, the move fails and a message appears onscreen.
• If all Policies do fit on the Span, a message dialog presents an alert that this operation may result in one or more Policies being uninstalled prior to installing the new Policy, that is; this operation will result in a Priority Mode installation. You have the option to proceed with the move, or cancel the move. If you choose to proceed with the move, Policy installation occurs automatically, and any current Policy may be uninstalled prior to installation of the new Policy.
IMPORTANT All Spans enforcing the same IPS Policy must be in the same time zone, since IPS Policies apply to time Intervals.
To create a Span Group
1. In the Performance Manager tree pane, right-click Span Groups, and then click Manage Span Groups. The Span Groups dialog box appears.
Span Groups
You must have Access Policy Features permission to create or modify Span Groups.
Objects Used in the ETM® System • 97 2. Click New. The Span Group Name dialog box appears.
3. Type a unique name for the Span Group. For example, you might create a Span Group for all of the PRI Spans at your Houston campus and name it PRI Spans-Houston. The name can consist of up to 50 characters and can include any special characters, spaces, digits, and letters.
4. Click OK. The Span Group appears in the Span Groups dialog box and in the Span Groups subtree of the Performance Manager tree pane. The Span Group is empty until you move one or more Spans to it.
Span Groups appear in the Span Groups subtree of the Performance Manager tree pane. Spans that have not yet been assigned to a Span Group appear under the Unassigned node. Spans that belong to a Span Group appear beneath that Group.
When you move a Span to a Span Group, it automatically receives any user-defined Policies installed on the Span Group. See “Span Groups” on page 96 for more information.
Moving a Span to a Span Group
The Unassigned Span Group contains all Spans that have not yet been specifically assigned to a group.
You cannot install Policies on the Unassigned Span Group. The default Policies are installed on these Spans.
98 • Objects
To move one or more Spans to a Span Group
1. In the Span Groups subtree of the Performance Manager tree pane, do one of the following to select the Span(s) to move:
• Right-click a Span, and then click Move Span(s).
• Hold down CTRL or SHIFT while selecting multiple Spans you want to move to the same Span Group, and then right-click the selection and click Move Span(s)
The Move Span(s) to Span Group dialog box appears.
2. Click the Span Group to which you want to move the Span(s), and then click OK.
To rename a Span Group
1. In the Span Groups subtree of the Performance Manager tree pane, right-click the Span Group and click Edit Span Group Name. The Span Group Name dialog box appears.
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2. In the Span Group name box, type the new name, and then click OK. The name can consist of up to 50 characters and can include any special characters, spaces, digits, and letters.
IMPORTANT All Spans in a Span Group assigned to an IPS Policy must be in the same time zone. An error message appears if you try to move Spans in a different time zone to a Span Group with an installed IPS Policy, and the Spans are not moved.
Renaming a Span Group
Deleting a Span Group
Objects Used in the ETM® System • 99 You cannot delete a Span Group that contains Spans. You must first move the Spans to a different Span Group. You can move them to the
Unassigned Group or a user-defined Group.
To delete a Span Group 1. Do one of the following:
• On the Performance Manager main menu, click Manage | Span Groups.
• In the Performance Manager tree pane, right-click the Span Groups subtree and click Manage Span Groups.
The Span Groups dialog box appears.
2. Click the Span Group you want to delete and click Delete. If delete does not become available when you click the Span Group, the Span Group still contains Spans. Note that you cannot delete the
Unassigned Span Group.
Understanding the Directory Manager • 101