Cluster formation 83
Cluster formation
Cluster criteria
A cluster can be formed between two or more M210 APs if the following conditions are met:
• The APs have the same part number. For example, part number J9798A cannot be
clustered with part number J9799A. You can view the part number on the System summary
page.
• The APs are configured with the same Country setting.
• The APs are connected on the same wired subnet. Clustering is not supported over a
wireless connection such as a WDS link.
• The APs joining the cluster have the same Cluster name setting.
• The APs are configured with the same Cluster IP version setting (IPv4 or IPv6).
• Clustering is enabled on each AP.
Cluster negotiation
When an M210 is configured with a cluster name and clustering is enabled, it begins sending
periodic advertisements every 10 seconds to announce its presence. If there are other M210s
that match the criteria for the cluster, arbitration begins to determine which AP provides its
configuration to the others. The first AP to advertise itself as a member of the cluster wins the
arbitration.
The following rules apply to cluster formation:
• For existing clusters, whenever the administrator updates the configuration of any member
of the cluster, the configuration change is shared with all members of the cluster, and the
configured AP assumes control of the cluster.
• When two separate clusters join into one, then the cluster that was created first wins
arbitration for cluster control. The configuration on the newly formed cluster is overwritten
by the configuration on the new cluster controller.
• If a cluster does not receive cluster advertisements from an AP for more than 60 seconds
(when, for example, the AP loses connectivity to other APs in the cluster), the AP is removed
from the cluster.
• If a clustered AP loses connectivity, it is not immediately dropped from the cluster. If it
regains connectivity and rejoins the cluster without having been dropped, and
configuration changes were made to that AP during the lost connectivity period, the
changes will be propagated to the other cluster members when connectivity resumes.
• If a clustered AP loses connectivity, is dropped from the cluster, and later rejoins the cluster,
and configuration changes were made in the cluster during the lost connectivity period, the
changes will be propagated to the AP when it rejoins. If there are configuration changes in
both the disconnected AP and the cluster, then the AP with the greatest number of changes
and, secondarily, the most recent change, will be selected to propagate its configuration to
the cluster. (That is, if AP1 has more changes, but AP2 has the most recent change, AP1 is
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