BGP Filtering Overview
BGP filtering works generally like IGP filtering, particularly like EIGRP. Similar to EIGRP, BGP Updates can be filtered on any router, without the restrictions that exist for OSPF with various area design issues. The filtering can examine the prefix information about each router and both the prefix and prefix length information, in either direction (in or out), on any BGP router.
The biggest conceptual differences between BGP and IGP filtering relate to what BGP can match about a prefix to make a choice of whether to filter the route. EIGRP focuses on matching the prefix/length. Not only can BGP also match the prefix/length, but it can also match a large set of BGP Path Attributes (PA). For example, a filter could compare ...
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