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Call Admission Control in MPLS Network RRS feed

  • Question

  • I'm about to deploy Call Admission Control for a customer with a large MPLS network. I have seen the following article and have some questions regarding the specifics of MPLS. This article suggests that no Central Site is needed when deploying CAC in an MPLS based network. However, the customer has two large DataCenters in the cloud that essentially mimic a Central Site in the sense that all Lync servers are in the one DataCenter. All satellite sites connect to the central DataCenter for everything. In the future, they may extend the Lync servers to the second DataCenter. What is the real purpose of the Central Site in Lync? Should I specify the main DataCenter as a central site in this config? I could see specifying the Network Region as NorthEast (or whatever) and then specifying the Primary DataCenter as the Central Site. Note that no client will connect to Lync from the DataCenter subnets. All Lync connections will come from subnets outside of the Primary DataCenter.

    MCITP Exchange 2010 | MCTS Exchange 2007 | MCITP Lync Server 2010 | MCTS Windows 2008 | MCSE 2003

    Wednesday, June 27, 2012 12:22 AM

Answers

  • In Lync CAC you can define the Sides as you will, because you will define the subnets as you Need. You can work with one Region and define all other sides as different Lync sites, so you can configure the bandwidth between this sides. You should configure a site where you also have a media gw for PSTN breakout, so you can also use media bypath and PSTN reroute

    regards Holger Technical Specialist UC

    • Proposed as answer by Sean_Xiao Monday, July 2, 2012 3:30 AM
    • Marked as answer by Sean_Xiao Friday, July 6, 2012 6:31 AM
    Wednesday, June 27, 2012 6:14 AM

All replies

  • In Lync CAC you can define the Sides as you will, because you will define the subnets as you Need. You can work with one Region and define all other sides as different Lync sites, so you can configure the bandwidth between this sides. You should configure a site where you also have a media gw for PSTN breakout, so you can also use media bypath and PSTN reroute

    regards Holger Technical Specialist UC

    • Proposed as answer by Sean_Xiao Monday, July 2, 2012 3:30 AM
    • Marked as answer by Sean_Xiao Friday, July 6, 2012 6:31 AM
    Wednesday, June 27, 2012 6:14 AM
  • The "central site" referenced in that article is not the same thing as the Central Site in a CAC Region.  Note the lack of capital letters, indicating it is just a common term, not specific to CAC configuration.

    Look at the documentation for New-CsNetworkRegion: Central Site =

    The central site running the bandwidth policy service. This service must be enabled in order to use CAC. This service runs on the Front End Server or the Standard Edition server.

    I have no idea why that is required, but in your case, it is clearly going to be the Site that contains your FE pool servers.  Keep in mind the Lync reports use these Sites and Regions names, so as long as a network subnet can include an endpoint for a Lync connection (including Lync servers), you should put them in the CAC Site list.

    Wednesday, June 27, 2012 10:27 PM
  • Hi, 

    Two questions related to the above. 

    1. Two Lync Enterprise pools serving one company and all sites using these pools are connected via the same MPLS provider. Defining a NetworkSite requires, region, and region requires,  a Central Site  Example: EMEA Pool and AMR pool.  Now, when Lync CAC is created for a site in EMEA  example London: SiteLondon (with it's subnets), EMEA region using the EMEA Central site is created.  For sites in AMR the AMR central site and region will be used.

    Now this being MPLS, and if i want to treat all sites hosted in the two pools connect via MPLS directly, will the above setup suffice?  

    2. If a re-route over PSTN (without media bypass) is required, is it necessary to create a site for the PSTN gateway or  the users have a PSTN gateway configured as part of their DialPlan (PSTNUsage ...) and Lync will automatically try to use the PSTN gateway associated with the user's dialplan?

    Many thanks.

    Farnelo

    Sunday, October 21, 2012 1:44 PM
  • 1.  Since you have two Regions, you need to add a Region Link and a Region Route.  Here is my example for you:

    Existing EMEA region - EMEA Central Site (EMEA pool)
    -sites in EMEA region

    Existing AMR region - AMR Central Site (AMR pool)
    -sites in AMR region

    Add Region Link:
    MPLS1: EMEA region & AMR region

    Add Region Route:
    MPLS1: EMEA region & AMR region

    2.  If you use CAC, you want to have a Site for every subnet.  Since your PSTN gateway is on your subnet, and every subnet has a Site, you would automatically create a Site for that PSTN gateway.  I know you asked if you needed to create a Site for the PSTN gateway, but I don't think the question is valid, since you have to create the Site anyway.  Make sense?

    Monday, October 22, 2012 4:23 PM