ILM GALSync with hub-and-spoke architecture

• Monday, June 07, 2010 10:38 PM

   

   
  

  2

  ILM Knowledge Bit

  In case you wish to implement a hub-and-spoke infrastructure for your Global Address List Sync with ILM/FIM, you need to tune the original GALSync setup.
  
  Hub-and-spoke architecture means one master GAL domain which communicates with slave domains, without direct provisioning between slave domains.
  
  
  
  For ease of use, I've put the decision logic in one function (shouldprovision).
  In the GALMV.vb file you need to create a private function (based on VB.NET code):

  Private Function shouldprovision( _   
       ByVal currentMVentry As MVEntry, _   
       ByVal mANAme As String) As Boolean
   
      'The only domain and MA name you need to know is the master domain
      'The master domain name is the FQDN of the AD domain
      'this is compared with the msOriginationForest attribute
      Const masterDomain As String = "g1.local" 'msOriginatingForest format
  
      'The master MA Name is the GALSync MA Name in the ILM GUI
      Const masterMAName As String = "GALSYNC1" 'MA NAME
   
      Dim IsHub As Boolean = _
             currentMVentry(EXCH_ORIGINATING_FOREST).StringValue.Equals(masterDomain)   
  
      Dim IsSpoke As Boolean = (Not mANAme.Equals(masterMAName))   
  
      'Provisioning OK if
            '1. source = hub and target = spoke
            '2. source = spoke and target = hub
   
      'Provisioning NOT OK if 
            'source = spoke and target = spoke  
   
      'Sample configuration with Hub: GAL1, spokes = GAL2,GAL3
         'See Truth table below
  
      'The function who matches this functionality is an inverted XOR
      'More info: http://en.wikipedia.org/wiki/XNOR_gate
   
      Return Not (IsSpoke Xor IsHub)   
  End Function
  

  Truth table:

  'Source MA	Target MA	isHub	IsSpoke	ShouldProvision Result
  GAL1	GAL2	TRUE	TRUE	TRUE
  GAL1	GAL3	TRUE	TRUE	TRUE
  GAL2	GAL1	FALSE	FALSE	TRUE
  GAL2	GAL3	FALSE	TRUE	FALSE
  GAL3	GAL1	FALSE	FALSE	TRUE
  GAL3	GAL2	FALSE	TRUE	FALSE

  In the Sub Provision of the GALMV.vb extension, add a call to the ShouldProvision function, like

  
  /../
  For i = 0 To galMAs.Length - 1
       MA = mventry.ConnectedMAs(galMAs(i).MAName)
       If 0 = MA.Connectors.Count Then
       '
       ' If there were no connectors, then we are going to add one
       '
       '## NEW CODE SNIPPET##>
       If shouldprovision(mventry, galMAs(i).MAName) THEN _ '<## NEW CODE SNIPPET##
       AddOrRenameConnector(MA, galMAs(i), mventry)
  
       ElseIf 1 = MA.Connectors.Count Then
  /../
  

  In this way the provisioning is blocked if not allowed.

  If you wish to convert your VB.NET code snippet to C# quickly (or vice versa), check the Developer Fusion tools.

  Go to the ILM Knowledge Bit Collection

  ---

  Peter Geelen - Sr. Consultant IDA (http://www.fim2010.be)
  
  [If a post helps to resolve your issue, please click the "Mark as Answer" or "Helpful" button at the top of that post. By marking a post as Answered or Helpful, you help others find the answer faster.]

  • Edited by Peter Geelen - MSFTMicrosoft Employee Tuesday, June 08, 2010 6:30 AM
  •