To create new prefix list, complete the following:
- Name: Enter the name of the IPv4 prefix list. Create a name that does not exceed 64 characters in length. Use numbers, any special characters, uppercase and lowercase letters, and even spaces. Start and end a name with any character but not a space. Leading and trailing spaces will be trimmed off automatically.
- Description: Enter the description for the IPv4 prefix list.
- Click Add and complete the following to add an IPv4 prefix to the list:
- ACTION: Choose the action you want to apply to this IPv4 prefix list. You can either allow or deny traffic to the route that matches the prefix list.
- IPV4 PREFIX: Enter the IPv4 prefix. For example, if you want to permit or deny traffic to 10.0.0.0/8, enter 10.0.0.0/8 here.
- IPV4 PREFIX LENGTH GREAT OR EQUAL: Specifies the prefix length that is greater than or equal to the subnet value. This is the lowest value of the range of the prefix length.
- IPV4 PREFIX LENGTH LESS OR EQUAL: Specifies the prefix length that is less than or equal to the subnet value. This is the highest value of the range of the prefix length.
- SEQUENCE: Enter a number from 1 to 2147483646 to determine the entry point of this IPv4 prefix list among other BGP configurations.
For example, if you set the following configuration: ACTION = Permit, IPv4 PREFIX = 10.0.0.0/8, and IPv4 PREFIX LENGTH LESS OR EQUAL = 19, then all networks that fall within the 10.0.0.0/8 range AND have a subnet mask of /19 or less are allowed through BGP.
- You can also delete a selected IPv4 prefix by clicking Remove.