After a Mediation Server Pool has
been installed, there generally is not much configuration left to do.
This section discusses some of the configuration options available to a
Mediation Server and addresses items that administrators should be
aware of when configuring a Mediation Server.
Certificate Requirements
The Mediation Server role in Lync Server 2013
is much like any other role in that it uses certificates both for
communication to other servers and for client services. A single
certificate is required for each server in the Mediation Server Pool.
This certificate is very basic, and has the following requirement:
• Default—The
default certificate is used for MTLS communications between servers,
and for securing SIP signaling in client communications. The
certificate should contain the pool name in the Subject field, each
Mediation Server’s name as a subject alternative name.
High-Availability
Redundancy for the Mediation Server role is
provided in a similar fashion as with Front End Servers and requires
just adding more Mediation Servers to a pool. Load balancing is
achieved via DNS load balancing, by providing multiple IP addresses
that resolve to the pool name of the Mediation Servers. If one IP
address is unavailable, the endpoint will attempt to connect to another
IP address provided for the pool in DNS.
Tip
Plan for high-availability in the environment
from the start, even if multiple Mediation Servers will not be deployed
initially. Completing the planning and configuration for
high-availability simplifies the deployment later and requires nearly
no changes to the existing infrastructure. Adding high-availability to
the environment later simply becomes a matter of adding a new server to
the topology, and creating the DNS records.
Adding Mediation Servers to a Pool
Adding a Mediation Server to a pool is much
like creating the initial pool. The topology must first be updated and
published to reflect the change. Follow the steps described previously
to import the existing topology in Topology Builder, and then follow
these steps to add another pool member:
1. Expand the Mediation Pools node.
2. Right-click the Mediation Pool name and select New Server.
3. Enter the fully qualified domain name of the new Mediation Server.
4. Select either Use
All Configured IP Addresses or Limit Service Usage to Selected IP
Addresses and enter the IP addresses to be used by the Lync Server 2013
services.
5. Optionally, select the IPv6 check box if IPv6 is in use on the network.
6. Click OK when complete.
