All updates that are received from neighboring AS 213 are processed by the route-map, which uses a community-list to find community 387:17. If the community-list matches one of the community attributes, the set command is executed and the route is permitted. If the route does not contain the right community, the route is simply permitted by route-map statement 9999 without changing anything in the update.
The result is that AS 387 prefers other paths to AS 213 because they have a default local preference of 100.
4-112 Configuring BGP on Cisco Routers (BGP) v3.2
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