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Polycom CMA System Operations Guide
386 Polycom, Inc.
Polycom CMA System Site Topology and Dial Plan Set Up
Site topology information describes your network and its interfaces to other
networks, including the following elements:
• Site — A local area network (LAN) that generally corresponds with a
geographic location such as an office or plant. A site contains one or more
network subnets, so a device’s IP address identifies the site to which it
belongs.
• Network clouds — A Multiprotocol Label Switching (MPLS) network
cloud defined in the site topology. An MPLS network is a private network
that links multiple locations and uses label switching to tag packets with
origin, destination, and quality of service (QOS) information.
Note that MPLS clouds are not associated with an IP address ranges, so
they can be used to group multiple subnets. They could also represent a
service provider.
While links to MPLS clouds have bandwidth and bit rate limitations, the
cloud is infinite. In this way, clouds reflect the way in which businesses
control bandwidth and bit rate.
• Internet/VPN — A entity that represents your network’s connection to the
public Internet.
• Site link — A network connection between two sites or between a site and
an MPLS network cloud.
• Site-to-site exclusion — A site-to-site connection that the site topology
doesn’t permit an audio or video call to use.
• Territory — A grouping of one or more sites for which a CMA system is
responsible.
The site topology you create within the CMA system should reflect your
network design. Consider the following information and best practices when
creating your site topology:
• If possible, connect all sites to an MPLS cloud. MPLS clouds are like
corporate networks, used to connect multiple subnets in multiple sites, but
all servicing a company.
• Avoid cross loops or multiple paths to a site; otherwise a call may have
different paths to a single destination. The more cross, circular, and multi
paths you have, the higher the number of calculations for a conference.
• Link sites that aren’t connected to an MPLS cloud directly to another site
that is connected to an MPLS cloud. Do not create orphan sites.
• Calls are routed through a bridge, so bandwidth and bit rate limits for the
site and subnet apply to all calls made using that bridge.
• Reserve the Internet/VPN “site” for IP addresses that fall outside your
private or corporate network (for example remote workers), because all
calls routed to the Internet/VPN site will be routed through the site on
your private or corporate network that has Internet access.