Clustering Overview; About Clustering; About The Configuration Master - Cisco TelePresence Administrator's Manual

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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 Cisco 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 Cisco TMS refer to peers as "members".
Overview and System
Introduction
status configuration
D14049.08
November 2010

About clustering

Cisco VCS Zones and Clustering and
configuration neighbors peers
Cisco
TelePresence
Management
Suite
(Cisco TMS)
Call Bandwidth
processing control
78
CISCO TELEPRESENCE VIDEO COMMUNICATION SERVER
VCS Cluster North
Peer 1 Peer 2 Peer 3 Peer 4 Peer 5 Peer 6
Cluster Subzone
Subzone
Traversal
Subzone
Default
Subzone
LOCAL
ZONE
Default DNS ENUM
Zone Zone Zone
VCS Cluster South
Peer 1 Peer 2 Peer 3 Peer 4
Cluster Subzone
Subzone
Traversal
Subzone
Default
Subzone
LOCAL
ZONE
Default DNS ENUM
Zone Zone Zone
Firewall
Applications Maintenance
traversal
ADMINISTRATOR GUIDE
Traversal
Client
Zone
Neighbor
Zone
Traversal
Client
Zone
Neighbor
Zone
Appendices