Specify clearly that the nic parameters depend on the
network-to-nodegroup connection.

Clarify in gnt-network how instance nics are connected to a network.

Signed-off-by: Guido Trotter <ultrot...@google.com>
---
 man/gnt-instance.rst |    5 ++++-
 man/gnt-network.rst  |   12 ++++++++++--
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/man/gnt-instance.rst b/man/gnt-instance.rst
index 91eadac..1ac094b 100644
--- a/man/gnt-instance.rst
+++ b/man/gnt-instance.rst
@@ -117,7 +117,10 @@ link
 network
     derives the mode and the link from the settings of the network
     which is identified by its name. If the network option is chosen,
-    link and mode must not be specified.
+    link and mode must not be specified. Note that the mode and link
+    depend on the network-to-nodegroup connection, thus allowing
+    different nodegroups to be connected to the same network in
+    different ways.
 
 
 Of these "mode" and "link" are nic parameters, and inherit their
diff --git a/man/gnt-network.rst b/man/gnt-network.rst
index fe65e4b..21ca20b 100644
--- a/man/gnt-network.rst
+++ b/man/gnt-network.rst
@@ -14,8 +14,10 @@ Synopsis
 DESCRIPTION
 -----------
 
-The **gnt-network** command is used for network definition
-administration in the Ganeti system.
+The **gnt-network** command is used for network definition and
+administration in the Ganeti system. Each instance nic can be connected
+to a network via the ``network`` nic parameter. See **gnt-instance**\(8)
+for more details.
 
 COMMANDS
 --------
@@ -50,6 +52,12 @@ IPv6 semantics can be assigned to the network via the 
``--network6`` and
 ``--gateway6`` options. IP pool is meaningless for IPV6 so those two
 values can be used for EUI64 generation from a NIC's MAC address.
 
+Note that a when connecting a network to a node group (see below) you
+can specify also the nic mode and link that will be used by instances on
+that group to physically connect to this network. This allows the system
+to work even if the parameters (eg. the VLAN number) change between
+groups.
+
 See **ganeti**\(7) for a description of ``--submit`` and other common
 options.
 
-- 
1.7.10.4

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