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:
installed on:
■
Rich media session licenses
■
TURN relay licenses
:
Small / Medium / CE500 systems
Large / CE1000 systems
Rich media sessions
150
500
TURN relays *
1800
6000
Table 7 Maximum licenses that a peer can use
* 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.
handling 1000 relays. On a Small/Medium system, there is a single TURN port that handles up to 1800 relays.
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 limited by its physical capacity. 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.
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 limited by its physical capacity. 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.
You can see a summary of all of the call and TURN relay licenses installed on each cluster peer by going to the Option
keys page and scrolling down to the Current licenses section.
keys page and scrolling down to the Current licenses section.
Capacity alarms are raised if either of the following usage thresholds are reached:
■
the number of concurrent calls reaches 90% of the capacity of the cluster
■
the number of concurrent calls on any one unit reaches 90% of the physical capacity of the unit
Managing Clusters and Peers
Setting Up a Cluster
Before setting up a cluster of X8.6 Expressway peers or adding an X8.6 Expressway to a cluster, ensure that:
■
All clusters peers are running the same version of code. The only occasion where different peers are allowed
to run different versions of code is for the short period of time while a cluster is being upgraded from one
version of code to another, during which time the cluster will operate in a partitioned fashion.
to run different versions of code is for the short period of time while a cluster is being upgraded from one
version of code to another, during which time the cluster will operate in a partitioned fashion.
■
A DNS SRV record is available for the cluster which contains A or AAAA records for each peer of the cluster.
■
Each peer has a different LAN configuration (a different IPv4 address and a different IPv6 address, where
enabled).
enabled).
■
Each peer in a cluster is within a 15ms hop (30ms round trip delay) of each and every other Expressway in or to
be added to the cluster.
be added to the cluster.
■
Each peer in a cluster is directly routable to each and every other Expressway in or to be added to the cluster.
(There must be no NAT between cluster peers – if there is a firewall ensure that the required ports are opened.)
(There must be no NAT between cluster peers – if there is a firewall ensure that the required ports are opened.)
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Cisco Expressway Administrator Guide