A multicast group communications
protocol is used to communicate among middle-tier SAS applications
in a single SAS deployment (the set of applications connected to the
same SAS Metadata Server). During installation, the SAS Deployment
Wizard supplies you with a default multicast address and port number
that it generates based on the machine's (metadata server) IP address.
The combination of multicast IP address and multicast UDP port should
be different for each SAS deployment and also different from those
used by other multicast applications at your site.
The IP address and multicast
UDP port number for the multicast host must match the values in the
Web application server's start-up script (for example,
SASServer1.bat)
and the
environment.properties file
located in the
SAS-config-dir\Lev1\Web\Applications\RemoteServices directory.
The multicast group
communication includes all information needed to bootstrap SAS middle-tier
applications. Because this includes sending the SAS environment credentials
(such as the sasadm account name and its password), scoping and encryption
options are provided in the SAS Deployment Wizard. The defaults are
most appropriate for deployments in the firewall, isolated data center
environment. After installation, if you choose to modify the scoping
or encryption options, you can do so by specifying the options for
the
-Dmulticast.security parameter
for your Web application server.