Maintaining A Cluster; Cluster Name; Cluster Pre-Shared Key; Setting Configuration For The Cluster - Cisco TelePresence Video Communication Server Administrator's Manual

Maintaining a cluster

The Clustering page (VCS configuration >
cluster, to which 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 used in SRV records that address this VCS cluster, for example
cluster1.example.com.
If you are using FindMe and you change the Cluster name, you may need to reconfigure the user
accounts. See the Clustering and FindMe

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.
Each peer in the cluster must be configured with the same Cluster pre-shared key.
n

Setting configuration for the cluster

You should 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 specific configuration items that are not replicated
n
user account details (you can maintain these on any peer — FindMe data uses a different replication
n
mechanism)
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.
Instructions for this are contained in the Cluster creation and maintenance deployment guide [27].
Note: systems that are configured as peers must not also be configured as neighbors to each other,
and vice versa.
If peers are deployed on different LANs, there must be sufficient connectivity between the networks to
ensure a low degree of latency between the peers - a maximum delay of 15ms one way, 30ms round-
trip.
Deploying all peers in a cluster on the same LAN means they can be configured with the same routing
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:
the original master peer fails
n
you want to take the master VCS unit out of service
n
Cisco VCS Administrator Guide (X6.1)
Clustering) lists the IP addresses of all the peers in the
section for further details.
Clustering and peers
Page 102 of 401