Maintaining A Cluster - Cisco TelePresence Administrator's Manual

Clustering and peers
A full step-by-step guide to setting up and configuring clusters is available in the
Maintenance Deployment

Maintaining a cluster

The Clustering page (System >
this VCS belongs, and identifies the master peer.
Cluster name
The Cluster name is used to identify one cluster of VCSs from another. Set it to the fully qualified domain
name (FQDN) used in SRV records that address this VCS cluster, for example cluster1.example.com.
The FQDN can comprise multiple levels. Each level's name can only contain letters, digits and hyphens,
with each level separated by a period (dot). A level name cannot start or end with a hyphen, and the final level
name must start with a letter.
A cluster name is also required if FindMe is enabled.
Cluster pre-shared key
The VCS uses IPsec (Internet Protocol Security) to enable secure communication between each cluster
peer.
The Cluster pre-shared key is the common IPsec access key used by each peer to access every other peer
in the cluster.
Note: each peer in the cluster must be configured with the same Cluster pre-shared key.
Setting configuration for the cluster
You should only make configuration changes on the master VCS. Any changes made on other peers are not
reflected across the cluster, and will be overwritten the next time the master's configuration is replicated
across the peers. The only exceptions to this are some
You may need to wait up to one minute before changes are updated across all peers in the cluster.
Adding and removing peers from a cluster
After a cluster has been set up you can add new peers to the cluster or remove peers from it.
Note that:
Systems that are configured as peers must not also be configured as neighbors to each other, and vice
n
versa.
If peers are deployed on different LANs, there must be sufficient connectivity between the networks to
n
ensure a low degree of latency between the peers - a maximum delay of 15ms one way, 30ms round-trip.
Cluster peers can be in separate subnets. Peers communicate with each other using H.323 messaging,
n
which can be transmitted across subnet boundaries.
Deploying all peers in a cluster on the same LAN means they can be configured with the same routing
n
information such as local domain names and local domain subnet masks.
Changing the master peer
You should only need to change the Configuration master when:
Cisco VCS Administrator Guide (X8.1.1)
Guide.
Clustering) lists the IP addresses of all the peers in the cluster, to which
VCS Cluster Creation and
peer-specific configuration
Managing clusters and peers
items.
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