C9800 need to change channel backhaul 5GHz

[sansan261]

Dear community,

I'm analyzing a return channel change for a mesh deployment. This is a small deployment of three APs in a chain with the possibility of expansion. In the lab environment, the channel was configured as static on the APs over the MAPs, initially obtained through DCA, and so it remained. Now, in the production environment, they need to adjust the channel to non-DFS, but because it's static, it doesn't allow it to change radio config to global (automatic), which seems valid to me.

"Error: AP slot 1 failed to process radio slot channel change - Mesh AP backhaul channel config cannot be changed"

I just wanted to confirm if modifying the channel statically with the new parameters, starting with the last MAP in the chain and finally on the RAP, would restore backhaul with the new channel.

This may be an obvious question, but the risk of losing the MAP is high, and the possibility of obtaining a chassis console is very difficult in the proposed environment.

Thanks in advance to anyone who can support.

[Rich R · Accepted solution]

Were you trying to change the MAP or the RAP?

You should have channel change notification enabled and then change the RAP.
The RAP notifies the MAPs (and they notify any subordinate MAPs) and they all do a coordinated change.

[sansan261]

Hi Rich, thank you for your contact.

I can confirm that this is indeed the case. After researching and reviewing documentation on the old WLC Aireos and understanding how the MAP monitors the RAP over the mesh, I executed the switch from a static channel to a more stable one finally leaving the DFS zone and the downtime was practically zero; only one icmp packet was lost.

thanks,