https://www.juniper.net/documentation/en_US/junos/topics/usage-guidelines/policy-defining-bgp-communities-and-extended-communities-for-use-in-routing-policy-match-conditions.html
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| route-target | is an extended community ( route distinguisher is part of the route: RD:x.x.x.x ) |
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| no-advertise —Routes in this community name must not be advertised to other BGP peers. "Take it but don't say to anyone" no-export —Routes in this community must not be advertised outside a BGP confederation boundary(or Area). A stand alone autonomous system that is not part of a confederation should be considered a confederation itself. no-export-subconfed —Routes in this community must not be advertised to external BGP peers, including peers in other members’ ASs inside a BGP confederation.
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