Configuring a Global Variable Set

A global variable set is a group of frequently used values that are defined as global variables. Global variables can be referenced by all route-filters configured on a device. This section describes how to configure global variable sets.

Context

The data type of each value in a global variable set may vary with the route-filter that references the set.

The global variables on a device must be unique. A new global variable will override an existing global variable with the same name.

To enable a route-filter or a set to reference a global variable, enter $+variable name, for example, $globvar.

Procedure

Configure a global variable set using the paragraph editing mode.
1. Run the edit xpl global-value command to enter the global variable set paragraph editing interface view.
2. Press i to enter the text editing mode.
  
  Sets or route-filters can be configured only in the text editing mode. If you exit from the text editing mode, you can perform shortcut key operations only.
3. Configure a start clause (xpl global-value) for a global variable set.
4. Configure set elements in the format of variable name+'value', for example, aaa '12', bbb'34', ccc '1.2.3.4'. Separate every two neighboring elements with a comma (,).
5. Configure an end clause (end-global-value) for the global variable set.
6. Press Esc to exit from the text editing mode.
7. Press :wq and Enter to save the configurations and exit from the global variable set paragraph editing interface view.
  
  A message is displayed for you to confirm whether to commit the configurations when you attempt to exit from the global variable set paragraph editing interface view. To commit the configurations, press Y.
  
  To exit from the global variable set paragraph editing interface view without saving the configurations, press :q! and Enter.
Configure a global variable set using the line editing mode.
1. Run the system-view command to enter the system view.
2. Run the xpl global-value command to enter the global variable set view.
3. Configure elements in the format of variable name+'value' in the global variable set view, for example, aaa'12', bbb'34', and aaa'1.2.3.4'. Separate every two neighboring elements with a comma (,).
4. Run the end-global-value command to conclude the configuration of the global variable set.
5. Run the commit command to commit the configuration.

Example

If only paragraph editing is used as an example, the corresponding line editing is similar. To use the line editing mode, perform the operations described in paragraph editing.

For detailed set and route-filter configuration steps, see Configuration Procedures of Sets and Route-Filters Using the Paragraph Editing Mode. For details about XPL clauses, see XPL Paragraph Editing Clauses.

Objective	Configure a global variable set that includes two values: 100 and ip-prefix.
Configuration Example	<HUAWEI> edit xpl global-value xpl global-value aaa '100', bbb 'ip-prefix', end-global-value The global variable set includes a set named aaa with value 100 and another set named bbb with value ip-prefix.
Objective	Configure a route-filter to permit only the routes with the MED value less than 100 and the routes that match the IPv4 prefix set named bbb.
Reference Example	<HUAWEI> edit xpl ip-prefix-list r1 xpl route-filter r1 if ip med le $aaa then approve elseif ip route-destination in $bbb then approve else refuse endif end-filter The route-filter r1 uses two global variables (aaa and bbb), in which aaa represents a MED value and bbb represents an IPv4 destination address prefix set. The route-filter permits only the routes with the MED value less than 100 and the routes that match bbb.