<ref column="other_config" key="cfm_extended"/> is true, the CFM
module operates in demand mode. When in demand mode, traffic
received on the <ref table="Interface"/> is used to indicate
- liveness. CCMs are still transmitted and received, but if the
- <ref table="Interface"/> is receiving traffic, their absence does not
- cause a connectivity fault.
+ liveness. CCMs are still transmitted and received. At least one
+ CCM must be received every 100 * <ref column="other_config"
+ key="cfm_interval"/> amount of time. Otherwise, even if traffic
+ are received, the CFM module will raise the connectivity fault.
</p>
<p>