Cisco TelePresence Administrator's Manual page 327

Overview and status information
You can cluster up to 6 VCS systems to increase capacity by a maximum factor of 4 (see
capabilities [p.356] for more information).
If a cluster peer becomes unavailable, the shareable licenses installed on that peer remain available to the
rest of the cluster peers for two weeks from the time the cluster lost contact with the peer. This will maintain
the overall license capacity of the cluster — however, note that each peer is still limited by its physical
capacity as listed above. After this two week period, the licenses associated with the unavailable peer are
removed from the cluster. To maintain the same capacity for your cluster, you should ensure that either the
problem with the peer is resolved or new option keys are installed on another peer in the cluster.
Note that you are also limited to the number of call license option keys that can be installed (purchased) per
VCS peer as follows:
Table 6: Maximum call license option keys that can be installed (purchased) per peer
Traversal calls
Non-traversal calls
TURN relays
You can see a summary of all of the call, registration and TURN relay licenses installed on each cluster peer
by going to the Option keys
See About clusters [p.158]
Cisco VCS Administrator Guide (X8.1.1)
Large VM servers VCS appliances (or equivalent VM)
500
500
6000
page and scrolling down to the
for more information.
100
500
1800
Current licenses section.
Resource usage
Performance
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