Configure an IPv4 prefix list

Use the Configure IPv4 Prefix list page to manage prefix list objects. These objects can be used when configuring route maps, policy maps, OSPF filtering, or BGP neighbor filtering.

You can use this object with Firewall Threat Defense devices.

Procedure

Step 1

Select Objects > Prefix Lists > IPv4 Prefix List from the table of contents.

Step 2

Click Add Prefix List.

  1. Enter a name for the prefix list object in the Name field

  2. Click Add.

Step 3

Select the appropriate action, Allow or Block, from the Action drop-down list to indicate the redistribution access.

Step 4

Enter a unique number in the Sequence No. field to specify the position of the new prefix list entry. If the field is left blank, the system assigns a sequence number that is five higher than the largest one currently in use.

Step 5

Specify the IPv4 address in the IP address/mask length format in the IP address field. The mask length must be a valid value between 1 and 32.

Step 6

Enter the minimum prefix length in the Minimum Prefix Length field and the maximum prefix length in the Maximum Prefix Length field.

The minimum prefix length value must be greater than the mask length and less than or equal to the Maximum Prefix Length, if specified.

If the Minimum Prefix Length is present, the maximum prefix length value must be greater than or equal to it. If the Minimum Prefix Length is not specified, the maximum value must be greater than the mask length.

Step 7

Click Add.

Step 8

If you want to allow overrides for this object, check the Allow Overrides check box; see Allow object overrides.

Step 9

Click Save.