Unique AS path count

You can configure a routing policy to determine the number of unique autonomous systems (ASs) present in the AS path. The unique AS path count helps determine whether a given AS is present in the AS path multiple times, typically as prepended ASs. In earlier Junos releases it was not possible to implement this counting behavior using the as-path regular expression policy. This feature permits the user to configure a policy based on the number of AS hops between the route originator and receiver. This feature ignores ASs in the as-path that are confederation ASs, such as confed_seq and confed_set. To configure AS path count, include the as-path-unique-count count (equal | orhigher | orlower) configuration statement at the [edit policy-options policy-statement policy_name from] hierarchy level.