[#643,!421] Added a note about shareable and non-shareable config in DHCP.

diff --git a/doc/guide/dhcp4-srv.xml b/doc/guide/dhcp4-srv.xml
index 880e1e621a414acceb2be9f77a1d9a1cb3653494..a2d8d0f8b8d21b01b50d913074991903f1ef1d5e 100644 (file)
--- a/doc/guide/dhcp4-srv.xml
+++ b/doc/guide/dhcp4-srv.xml
@@ -5673,6 +5673,17 @@ autogenerated IDs are not stable across configuration changes.</para>
         (<command>option-data</command>) is performed using the
         <command>remote-option4-global-set</command>.</para>
 
+        <para>The <xref linkend="cb-sharing"/> explains the concept of shareable
+        and non-shareable configuration elements and the limitations for
+        sharing them between multiple servers. In the DHCP configuration (both DHCPv4
+        and DHCPv6) the shareable configuration elements are: subnets and shared
+        networks. Thus they can be explicitly associated with multiple server tags.
+        The global parameters, option definitions and global options are not shareable
+        and they can be associated with only one server tag. This rule does not apply
+        to the configuration elements associated with "all" servers. Any configuration
+        element associated with "all" servers (using "all" keyword as a server tag) is
+        used by all servers connecting to the configuration database.</para>
+
         <para>
           <table frame="all" xml:id="dhcp4-cb-parameters">
             <title>List of DHCPv4 Parameters Supported by the Configuration Backend</title>