Events such as soft reconfiguration and policy modifications can trigger the BGP internal state to change. To ensure state consistency between active and standby BGP processes during such events, the concept of post-it is introduced that act as synchronization points.
source: Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
-> Outstanding Postits: 0, should mean BGP state changes are in sync
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