Managing prefix lists

The table of prefix lists is displayed in the CPE template and on the CPE device:

• To display the table of prefix lists in a CPE template, go to the SD-WAN → CPE templates menu section, click the CPE template, and select the Routing filters → Prefix lists tab.
• To display the table of prefix lists on a CPE device, go to the SD-WAN → CPE menu section, click the CPE device, and select the Routing filters → Prefix lists tab.

Information about prefix lists is displayed in the following columns of the table:

• Name is the name of the prefix list.
• Inherited indicates whether the prefix list is inherited from the CPE template:
  • Yes
  • No

  This column is displayed only on the CPE device.

• Sequence is the sequence number of the rule in the prefix list. The rule with the lowest sequence number is the first to be applied to the IPv4 prefix by the prefix list.
• Network is the IPv4 prefix to which the prefix list applies the rule.
• Action is the action that the rule performs on the IPv4 prefix:
  • Permit allows the IPv4 prefix.
  • Deny blocks the IPv4 prefix.
• Greater or equal is starting value of the prefix length range to which the prefix list applies the rule.
• Less or equal is the ending value of the prefix length range to which the prefix list applies the rule.
• Management contains the actions that can be performed on the prefix list.

Creating a prefix list

You can create a prefix list in the CPE template or on a CPE device. A prefix list created in the CPE template is automatically created on all CPE devices that use this CPE template.

To create a prefix list:

1. Create a prefix list in one of the following ways:
   • If you want to create a prefix list in a CPE template, go to the SD-WAN → CPE templates menu section, click the CPE template, and select the Routing filters → Prefix lists tab.
   • If you want to create a prefix list on a CPE device, go to the SD-WAN menu section, click the CPE device, select the Routing filters → Prefix lists tab, and select the Override check box.

   A table of prefix lists is displayed.

2. Click + Prefix list.
3. This opens a window; in that window, in the Name field, enter the name of the prefix list. Maximum length: 50 characters. Do not use spaces in this field.
4. Create a rule in the prefix list:
   1. Click + Rule.
   2. In the Sequence field, enter the sequential number of the rule. The rule with the lowest sequence number is the first to be applied to the IPv4 prefix by the prefix list. Range of values: 1 to 4,294,967,295.
   3. In the Network drop-down list, select the type of the rule:
      • Any network for a rule that allows or denies all IPv4 prefixes.
      • IP/mask for a rule that allows or denies the specified IPv4 prefix. Default value. If you select this value, enter the IPv4 prefix in the field that is displayed.
   4. In the Action drop-down list, select the action that the rule performs with the IPv4 prefix:
   5. In the Greater or equal field, enter the starting value of the prefix length range to which the prefix list applies the rule. Range of values: 0 to 32.
   6. In the Less or equal field, enter the ending value of the prefix length range to which the prefix list applies the rule. Range of values: 0 to 32.

   The rule is created. You can create multiple rules or delete a rule. To delete a rule, click the delete icon next to it.

5. Click Create.

   The prefix list is created and displayed in the table.

6. In the upper part of the settings area, click Save to save the settings of the CPE template or CPE device.

Editing a prefix list

You can edit a prefix list in a CPE template or on a CPE device. An prefix list edited in the CPE template is automatically modified on all CPE devices that use this CPE template.

To edit a prefix list:

1. Edit a prefix list in one of the following ways:
   • If you want to edit a prefix list in a CPE template, go to the SD-WAN → CPE templates menu section, click the CPE template, and select the Routing filters → Prefix lists tab.
   • If you want to edit a prefix list on a CPE device, go to the SD-WAN menu section, click the CPE device, select the Routing filters → Prefix lists tab, and select the Override check box.

   A table of prefix lists is displayed.

2. Click Edit next to the prefix list that you want to edit.
3. This opens a window; in that window, if necessary, edit the settings of the prefix list. For a description of the settings, see the instructions for creating a prefix list.
4. Click Save.

   The prefix list is modified and updated in the table.

5. In the upper part of the settings area, click Save to save the settings of the CPE template or CPE device.

Deleting a prefix list

You can delete a prefix list in a CPE template or on a CPE device. A prefix list deleted in the CPE template is automatically deleted on all CPE devices that use this CPE template.

Deleted prefix lists cannot be restored.

To delete a prefix list:

1. Delete a prefix list in one of the following ways:
   • If you want to delete a prefix list in a CPE template, go to the SD-WAN → CPE templates menu section, click the CPE template, and select the Routing filters → Prefix lists tab.
   • If you want to delete a prefix list on a CPE device, go to the SD-WAN → CPE menu section, click the CPE device, select the Routing filters → Prefix lists tab, and select the Override check box.

   A table of prefix lists is displayed.

2. Click Delete next to the prefix list that you want to delete.
3. In the confirmation window, click Delete.

   The prefix list is deleted and is no longer displayed in the table.

4. In the upper part of the settings area, click Save to save the settings of the CPE template or CPE device.