If the value is set to 'true', a message is
sent in response to a (Fibre Channel) ELS Echo
frame received from the peer. Some B Port
implementations use ELS Echo request/response frames
as Link Keep Alive.
If it is set to 'false', this response is not
generated.
This object is valid only if the
cfmFcipLinkExtLocalBPortEnable is 'true'.