BGP community propagation
By default, BGP communities are not shared between BGP neighbors. If you want to exchange these, you have to use the neighbor send-community command.
You can enable this for standard or extended communities:
neighbor send-community [standard | extended | both]
- standard - only standard communities will be sent
- extended - only extended communities will be sent
- both - both standard and extended communities will be sent
For more information about BGP community types, take a look at BGP community types