bfd: Require bfd control packet received in forwarding_if_rx mode.

[sliver-openvswitch.git] / vswitchd / vswitch.xml

diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
index aa9168d..7f2fd58 100644 (file)
--- a/vswitchd/vswitch.xml
+++ b/vswitchd/vswitch.xml
@@ -1968,10 +1968,13 @@
        </column>
 
        <column name="bfd" key="forwarding_if_rx" type='{"type": "boolean"}'>
-          True to consider the interface capable of packet I/O as long as it
-          continues to receive any packets (not just BFD packets).  This
-          prevents link congestion that causes consecutive BFD control packets
-          to be lost from marking the interface down.
+          When <code>true</code>, traffic received on the
+          <ref table="Interface"/> is used to indicate the capability of packet
+          I/O.  BFD control packets are still transmitted and received.  At
+          least one BFD control packet must be received every 100 * <ref
+          column="bfd" key="min_rx"/> amount of time.  Otherwise, even if
+          traffic are received, the <ref column="bfd" key="forwarding"/>
+          will be <code>false</code>.
        </column>
 
        <column name="bfd" key="cpath_down" type='{"type": "boolean"}'>