Methods and apparatus for cluster licensing in wireless switch architecture
Wireless switch licenses are assigned on a cluster basis rather than being limited to individual switches. A switch cluster is made up of two or more wireless switches that each having an assigned number of licenses. Each of the wireless switches is configured to establish the switch cluster with the other wireless switches, and to verify the identity of each other wireless switch in the switch cluster during operation. License restrictions are enforced based upon a total number of licenses for the switch cluster so that the sum of the numbers of licenses assigned to the wireless switches in the cluster are available for use even if one or more of the other wireless switches in the cluster become unavailable.
1. A method of operating one of a plurality of wireless switches arranged in a wireless switch cluster each having an assigned number of licenses, the method comprising the steps of:
establishing a cluster of wireless switches having a cluster license maximum, wherein the cluster license maximum equals a greatest number of licenses held by any switch in the cluster of wireless switches;
verifying the identity and the assigned number of licenses for each of the other wireless switches in the cluster during operation, such that each wireless switch recognizes the greatest number of assigned licenses to any one switch as the cluster license maximum; and
any wireless switch of the cluster operating to exceed its assigned number of licenses up to, but not exceeding, the cluster license maximum if one or more of the other switches in the cluster become unavailable.
2. The method of claim 1 wherein the assigned number of licenses for at least one of the wireless switches in the cluster is zero.
3. The method of claim 1 wherein the identity of each other wireless switch in the cluster is verified based upon a media access control (MAC) address of the switch.
4. The method of claim 1 , wherein verifying includes each switch sending a routing list of access points assigned to that switch, and further comprising the step of adopting an access point assigned to another one of the switches in the plurality of switches if the another one of the switches becomes unavailable.
5. The method of claim 1 wherein verifying includes each switch transmitting a heartbeat signal to the other switches in the switch cluster.
6. The method of claim 5 wherein the heartbeat signal comprises an identifier of the wireless switch and a number of licenses assigned to the wireless switch.
7. The method of claim 6 wherein the identifier is a media access control number.
8. The method of claim 6 wherein the identifier is a serial number of the wireless switch.
9. The method of claim 1 further comprising the step of reverting to enforcing the number of licenses assigned to the wireless switch if the cluster is broken.
10. The method of claim 9 wherein the cluster is broken though reconfiguration of the wireless switch.
11. The method of claim 9 wherein the cluster is broken though addition of another wireless switch not previously in the cluster.
12. The method of claim 1 wherein establishing includes each switch being provided a cryptographic key that is decrypted by the switch to unlocked its licensed capability.
13. The method of claim 1 further comprising the step of purchasing licenses for a single switch in the cluster.
14. A wireless switch operating as one of a plurality of wireless switches in a wireless switch cluster each having an assigned number of licenses, the wireless switch comprising:
means for establishing a cluster of wireless switches having a cluster license maximum, wherein the cluster license maximum equals a greatest number of licenses held by any switch in the cluster of wireless switches;
means for verifying the identity of each other wireless switch in the cluster during operation, such that the wireless switch recognizes the greatest number of assigned licenses to any one switch as the cluster license maximum; and
means for operating to exceed its assigned number of licenses up to, but not exceeding, the cluster license maximum if one or more of the other switches in the cluster become unavailable.
15. A switch cluster comprising a plurality of wireless switches each having an assigned number of licenses, wherein each of the plurality of wireless switches is configured to establish the switch cluster having a cluster license maximum with the other wireless switches, wherein the cluster license maximum equals a greatest number of licenses held by any switch in the cluster of wireless switches, to verify the identity of each other wireless switch in the switch cluster during operation, such that each wireless switch recognizes the greatest number of assigned licenses to any one switch as the cluster license maximum, and any wireless switch of the cluster operable to exceed its assigned number of licenses up to, but not exceeding, the cluster license maximum if one or more of the other switches in the cluster become unavailable.