Configuring an IPv6 Prefix Set

IPv6 prefix sets apply to all dynamic routing protocols and can be used to match source, destination, and next hop IPv6 addresses. This section describes how to configure IPv6 prefix sets.

Procedure

Configure an IPv6 prefix set using the paragraph editing mode.
1. Run the edit xpl ipv6-prefix-list ipv6-prefix-list-name command to enter the IPv6 prefix 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 ipv6-prefix-list ipv6-prefix-list-name) for an IPv6 prefix set.
4. Configure elements (IPv6 addresses with masks, 2001:db8:0:1::64 for example) for the set and separate every two neighboring elements with a comma (,). You can use eq, ge, or le to specify the mask length.
5. Configure an end clause (end-list) for the IPv6 prefix 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 an IPv6 prefix set using the line editing mode.
1. Run the system-view command to enter the system view.
2. Run the xpl ipv6-prefix-list ipv6-prefix-list-name command to enter the IPv6 prefix set view.
3. Configure elements (IPv6 addresses with masks, such as 2001:db8:0:1::64) for the set and separate every two neighboring elements with a comma (,). You can use eq, ge, or le to specify the mask length.
4. Run the end-list command to conclude the configuration of the IPv6 prefix set, exit the IPv6 prefix set view, and return to the system view.
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 an IPv6 prefix set to match the routes in network segments 2001:db8:0:1::/64, 2001:db8:1:1::/64, and 2001:db8:1:2::/64.
Configuration Example 1	<HUAWEI> edit xpl ipv6-prefix-list aaa xpl ipv6-prefix-list aaa 2001:db8:0:1:: 64, 2001:db8:1:1:: 64, 2001:db8:1:2:: 64 end-list The IPv6 prefix set aaa includes three elements and matches the routes in network segments 2001:db8:0:1::/64, 2001:db8:1:1::/64, and 2001:db8:1:2::/64.
Objective	Configure an IPv6 prefix set to match the routes in network segment 2001:db8:0:1::/64 with the mask length ranging from 96 to 100 bits, the routes in network segment 2001:db8:1:1::/64 with the mask length greater than or equal to 100 bits, and the routes in network segment 2001:db8:1:2::/64 with the mask length of 96 bits.
Configuration Example 2	<HUAWEI> edit xpl ipv6-prefix-list aaa xpl ipv6-prefix-list aaa 2001:db8:0:1:: 64 ge 96 le 100, 2001:db8:1:1:: 64 le 100, 2001:db8:1:2:: 64 eq 96 end-list The IPv6 prefix set bbb includes three elements and matches the routes in network segment 2001:db8:0:1::/64 with the mask length ranging from 96 to 100 bits, the routes in network segment 2001:db8:1:1::/64 with the mask length greater than or equal to 100 bits, and the routes in network segment 2001:db8:1:2::/64 with the mask length of 96 bits.
Objective	Configure a route-filter to deny the routes that match IPv6 prefix set bbb and the routes that match neither IPv6 prefix set aaa nor bbb and permit the routes that do not match bbb but match aaa and increase their MED values by 10.
Reference Example	<HUAWEI> edit xpl route-filter r1 xpl route-filter r1 if ip route-destination in bbb then refuse elseif ip route-destination in aaa then apply med + 10 else refuse endif end-filter The route-filter r1 references two IPv6 destination address prefix sets (aaa and bbb), denies the routes that match IPv6 destination address prefix set bbb, permits the routes that do not match bbb but match aaa and increases their MED values by 10, and denies all other routes.