BGP (Border Gateway Protocol) uses access lists to control which prefixes are advertised to its peers or which peers are allowed to receive updates for specific prefixes.
In BGP, access lists are used in two main ways:
1. Prefix filtering: BGP access lists can be used to filter out specific prefixes from being advertised to peers. This filtering can be based on IP address ranges, subnet masks, or specific destinations.
1. Peer filtering: BGP access lists can also be used to control which peers are allowed to receive updates for specific prefixes. This filtering can be based on peer IP address, AS number, or other criteria.
Access lists in BGP can be configured using various syntaxes, including standard and extended access lists, prefix lists, and route maps. The specific syntax used will depend on the network topology and the specific requirements for prefix and peer filtering.
