Editing a prefix list

You can edit a prefix list in a CPE template or on a device. When you edit a prefix list in a CPE template, the prefix list is automatically modified on all devices that are using the 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 template and in the displayed settings area, 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 device, and in the displayed settings area, 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, in the Name field, enter the name of the prefix list. Maximum length: 50 characters. Do not use spaces in this field.
4. Edit a rule in the prefix list:
   1. 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.
   2. 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.
   3. In the Action drop-down list, select the action that the rule performs on the IPv4 prefix:
      • Permit allows the IPv4 prefix. Default value.
      • Deny denies the IPv4 prefix.
   4. In the Greater or equal field, enter the start value of the subnet mask range. Range of values: 0 to 32.
   5. In the Less or equal field, enter the end value of the subnet mask range. Range of values: 0 to 32.
5. If you want to create a rule in the prefix list:
   1. Click + Rule.
   2. Specify rule settings. The rule settings are described at step 4 of these instructions.

   The rule is created. You can add multiple rules; to delete a rule, click the delete icon next to it.

6. Click Save.

   The prefix list is modified and updated in the table.

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