A question about using 'update keyspace with strategyoptions' command

[Lu, Boying]

Hi, All,

I want to run 'update keyspace with strategy_options={dc1:3, dc2:3}' from 
cassandra-cli to update the strategy options of some keyspace
in a multi-DC environment.

When the command returns successfully, does it mean that the strategy options 
have been updated successfully or I need to wait
some time for the change to be propagated  to all DCs?

Thanks

Boying