Route Refresh helps minimize the memory footprint of BGP (Border Gateway Protocol) by not storing the original BGP route path attributes from a neighbor that advertises route refresh capability in an OPEN message. Whenever you execute the command configure bgp neighbor [remoteAddr | all] {addressfamily [ipv4-unicast | ipv4-multicast]} soft-reset in, BGP sends a route refresh message to its peer if that peer had advertised route refresh capability in its OPEN message. In response to the route refresh message, the neighbor sends its entire RIB-OUT database for the requested address family. This helps reapply the inbound neighbor policy, if there are any changes.
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