Access Rules

Overview:

Filtering is used for both input and output of the routing information. Once a filter is defined, it can be applied in any direction.

Functionality:

Route Filters can be divided into 2 categories

1) Access Lists
2) Prefix Lists

Access List entries determine if networks are allowed or denied. Each Access List entry includes an action element (permit or deny) and a filter element. The filter element is based on criteria such as: source address, destination address, protocol, and protocol-specific parameters. Access lists are used for packet filters.

Detailed information on each parameter is beyond the scope of the document as is part of understanding Filtering. Information on different configuration parameters can be found http://docs.frrouting.org/en/stable-7.3/filter.html

Configuration Parameters

Add an Access list

Use Cases:

Access and Prefix Lists are mainly used in context with BGP and OSPF.