any defined controllers forever.</dd>
</dl>
</p>
- <p>If this value is unset, the default is implementation-specific.</p>
+ <p>
+ The default is <code>standalone</code> if the value is unset, but
+ future versions of Open vSwitch may change the default.
+ </p>
+ <p>
+ The <code>standalone</code> mode can create forwarding loops on a
+ bridge that has more than one uplink port unless STP is enabled. To
+ avoid loops on such a bridge, configure <code>secure</code> mode or
+ enable STP (see <ref column="stp_enable"/>).
+ </p>
<p>When more than one controller is configured,
<ref column="fail_mode"/> is considered only when none of the
configured controllers can be contacted.</p>
<column name="other_config" key="cfm_interval"
type='{"type": "integer"}'>
- The interval, in milliseconds, between transmissions of CFM heartbeats.
- Three missed heartbeat receptions indicate a connectivity fault.
- Defaults to 1000.
+ <p>
+ The interval, in milliseconds, between transmissions of CFM
+ heartbeats. Three missed heartbeat receptions indicate a
+ connectivity fault.
+ </p>
+
+ <p>
+ In standard operation only intervals of 3, 10, 100, 1,000, 10,000,
+ 60,000, or 600,000 ms are supported. Other values will be rounded
+ down to the nearest value on the list. Extended mode (see <ref
+ column="other_config" key="cfm_extended"/>) supports any interval up
+ to 65,535 ms. In either mode, the default is 1000 ms.
+ </p>
+
+ <p>We do not recommend using intervals less than 100 ms.</p>
</column>
<column name="other_config" key="cfm_extended"