
78
D14049.07
March 2010
Grey Headline
(continued)
TANDBERG
VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
Introduction
Overview and
status
System
configuration
VCS
configuration
Zones and
neighbors
Clustering and
peers
Call
processing
Bandwidth
control
Firewall
traversal
Appendices
Applications
Maintenance
Clustering overview
A VCS can be part of a cluster of up to six VCSs. Each VCS in the cluster is a peer of every other
VCS in the cluster. Clusters are used to:
•
increase the capacity of your VCS deployment compared with a single VCS
•
provide redundancy in the rare case that a VCS becomes unavailable (for example, due to a
network or power outage).
Peers have identical configuration, and share information with each other about their use of
bandwidth, registrations, and FindMe users. This allows the cluster to act as one large VCS Local
Zone.
The diagram opposite shows two separate clusters, both being monitored by TMS.
About the configuration master
All peers in a cluster must be configured identically for subzones, zones, links, pipes,
authentication, bandwidth control and call policy. To achieve this, you define a cluster name and
nominate one peer as the configuration master. Approximately every minute, all the other peers in
the cluster request updated configuration information from the master, and overwrite their existing
configuration with these new settings.
”Alternate” is an H.323 term for a system used to provide redundancy to a Primary
gatekeeper, and prior to version X3.0 the VCS supported Alternates. From X3.0 onwards,
redundancy (along with other features) is provided by clusters of peers, which support both
H.323 and SIP and work as equals. However, peers may sometimes be referred to as Alternates.
Also note that some versions of TMS refer to peers as "members".
About clustering
LOCAL
ZONE
Traversal
Subzone
Default
DNS
Zone
ENUM
Zone
Neighbor
Zone
Traversal
Client
Zone
Subzone
Default
Zone
Peer 1
Cluster Subzone
VCS Cluster South
Subzone
Peer 2
Peer 3
Peer 4
LOCAL
ZONE
Traversal
Subzone
Default
DNS
Zone
ENUM
Zone
Neighbor
Zone
Traversal
Client
Zone
Subzone
Default
Zone
Cluster Subzone
VCS Cluster North
Subzone
Peer 2
Peer 3
Peer 4
Peer 1
Peer 5
Peer 6
TANDBERG
Management
Suite
(TMS)