What is a route filter?

While a policy can contain multiple route filters, the term "route filter" itself typically refers to a single prefix specification with its matching criteria, not inherently a "list." A "prefix-list" or "address-set" is a separate concept for a collection of prefixes.

A route filter is typically configured *within* a policy statement, not separately as a standalone entity that is then referenced. Separate entities for lists of prefixes are usually called prefix-lists or address-sets.

This describes a prefix-list or address-set, which is a named collection of prefixes, rather than a single route filter which is a specific matching clause.

A route filter is a clause within a routing policy term that specifies a single IP prefix and often a match condition (e.g., exact, longer, up to, or through) to precisely identify a route or set of routes for the policy to act upon. It is directly configured as part of a policy term's `from` statement.