nodetool disablegossip 

Disables the gossip protocol.

Disables the gossip protocol.

Synopsis 

$ nodetool <options> disablegossip
Options
Short Long Description
-h --host Hostname or IP address.
-p --port Port number.
-pwf --password-file Password file path.
-pw --password Password.
-u --username Remote JMX agent username.
-- Separates an option from an argument that could be mistaken for a option.

Description 

This command effectively marks the node as being down.