Cisco Cisco Expressway Maintenance Manual
License usage within a cluster
The following types of licenses are pooled for use by any peer in a cluster, irrespective of which peer the
licenses are installed on:
licenses are installed on:
n
Rich media session licenses
n
TURN relay licenses
License usage is limited by the maximum physical capacity of each Expressway system according to the
Small / Medium systems
Large systems
Rich media sessions
150
500
TURN relays *
1800
6000
Table 4: Maximum physical capacity per peer
* On a Large system, the total TURN capacity of 6000 relays is spread evenly across 6 ports; each port is
limited to handling 1000 relays. On a Small/Medium system, there is a single TURN port that handles up to
1800 relays.
limited to handling 1000 relays. On a Small/Medium system, there is a single TURN port that handles up to
1800 relays.
You can cluster up to 6 Expressway systems to increase capacity by a maximum factor of 4 (see
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.
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
Expressway peer as follows:
Expressway peer as follows:
Small / Medium systems
Large systems
Rich media sessions
100
500
TURN relays
1800
6000
Table 5: Maximum call license option keys that can be installed (purchased) per peer
You can see a summary of all of the call and TURN relay licenses installed on each cluster peer by going to
the
the
Option keys
page and scrolling down to the
Current licenses
section.
Capacity alarms are raised if either of the following usage thresholds are reached:
n
the number of concurrent calls reaches 90% of the capacity of the cluster
n
the number of concurrent calls on any one unit reaches 90% of the physical capacity of the unit
Cisco Expressway Administrator Guide (X8.2)
Page 127 of 378
Clustering and peers
License usage within a cluster