Legacy Open Mesh: What Does the “Auto” Channel Selection Do?



What does the "Auto" channel selection do?


  • Datto access points


Auto Channel Mode

Auto mode will automatically select channels used by access points on your network based on site survey scans reported by each access point.

Auto mode survey scans and channel adjustments occur during the time frame specified for your maintenance window, however Auto mode will run every night of week regardless of days selected. The network will be intermittently available for 10 - 15 minutes while Auto mode does its scans and adjusts channels, so ensure you set your maintenance window to times when there is minimal usage on the network.

Note: All access points in the network need to be online and consistently checking in for Auto mode to run successfully. The access points also need to be part of the same local network, and within physical vicinity of each other.

While Auto mode is enabled any existing channel overrides will be overridden. If Auto mode is later disabled, the user’s original channel overrides, if any, will again be used.

Auto mode will adjust channels and channel widths to avoid overlap between access points, and minimize the number of hops used by wireless repeaters with the goals of maximizing client throughput, improved mesh speeds, and avoiding orphaned mesh nodes.

Technical Details

Decision making for wired gateways

From our scan results, we create a graph of possible mesh connections and assign channels to gateways by trying to avoid external interference (access points, spectrum scan results). We then assign channels for gateways with the smallest amount of channel alternatives and/or the most interference nearby. If a gateway is a dual-band device, we assign channels independently for each band as per the goals above.

Decision making for wireless repeaters.

All repeater nodes get a channel assigned and we compute scores for all possible edges. A "possible edge" is between an unassigned node and an assigned node. Our scoring takes into account: outside interference, link quality, and capacity of the assigned node. We then assign a channel to the node with the best scored possible edge. if the repeater is a dual-band device, we treat the second band as if it's a gateway and assign channels independently just the same.


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