[ovs-dev] [PATCH] cfm: Refine the cfm_extended manual.

Alex Wang alexw at nicira.com
Sat Oct 26 00:18:02 UTC 2013


Commit 348f01e3e3 (cfm: Eight byte MPIDs in extended mode.) allows
eight byte MPIDs when running in extended mode.  This commit explains
this change in the vswitch.conf.db.

Signed-off-by: Alex Wang <alexw at nicira.com>
---
 vswitchd/vswitch.xml |   21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
index c12fd8f..8e4a864 100644
--- a/vswitchd/vswitch.xml
+++ b/vswitchd/vswitch.xml
@@ -1993,11 +1993,18 @@
       </p>
 
       <column name="cfm_mpid">
-        A Maintenance Point ID (MPID) uniquely identifies each endpoint within
-        a Maintenance Association.  The MPID is used to identify this endpoint
-        to other Maintenance Points in the MA.  Each end of a link being
-        monitored should have a different MPID.  Must be configured to enable
-        CFM on this <ref table="Interface"/>.
+       <p>
+         A Maintenance Point ID (MPID) uniquely identifies each endpoint within
+         a Maintenance Association.  The MPID is used to identify this endpoint
+         to other Maintenance Points in the MA.  Each end of a link being
+         monitored should have a different MPID.  Must be configured to enable
+         CFM on this <ref table="Interface"/>.
+       </p>
+       <p>
+         According to the 802.1ag specification, MPIDs can only range between
+         [1, 8191].  However, extended mode (see <ref column="other_config"
+         key="cfm_extended"/>) supports eight byte MPIDs.
+      </p>
       </column>
 
       <column name="cfm_fault">
@@ -2122,8 +2129,8 @@
         with compliant implementations which may be running concurrently on the
         network. Furthermore, extended mode increases the accuracy of the
         <code>cfm_interval</code> configuration parameter by breaking wire
-        compatibility with 802.1ag compliant implementations.  Defaults to
-        <code>false</code>.
+        compatibility with 802.1ag compliant implementations.  And extended
+        mode allows eight byte MPIDs.  Defaults to <code>false</code>.
       </column>
 
       <column name="other_config" key="cfm_demand" type='{"type": "boolean"}'>
-- 
1.7.9.5




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