We recently deployed a redundant radio link between 2 of our sites just as you want to do.
This was my original set up
which we decided needed redundancy as there are approx 100 users at the far end of the link and this is there sole connection to our servers and the internet
This was the solution
In my case the first link uses 24GHZ spectrum radios operating at 775 Mbps full duplexand the 2nd link uses 5GHZ spectrum radios operating at 500 Mbps full duplex with matching cisco switches on both ends. The radios are actually the easy part. The switches were the issue in my case. I had to bring in a Cisco guy to do the programing and it still took him to attempts to get it working. It will depend on the capabilities of the switches you have. At the start we had hoped to be able to use both radio links and aggregate the throughput but due to limitations with the switches we had we were forced to settle for simple active passive failover. If a link fails it will fail to the second link an only drop a single packet.
As a backup I also have ping watchdog enabled on my radios (a feature of Ubiquiti) basicly if the radio link goes down and the radios can’t see each other for a set period of time and number of pings they both restart and try to re-establish the link
There are a few things you will need to make this work
You need switches on both ends that will support port trunking \ aggregation so you can link the 2 connections together You will need a 2nd radio link (2 radios) with similar speed \ capacities (port trunking \ aggregation requirement) to the first link but on a different frequency. For example if your first link uses radios in the 2.4 GHZ range the 2nd link should use radios in the 5.8 GHZ range (or 900MHZ, 24GHZ, etc) The key is to use a completely different frequency range to avoid interference between the 2 links Mounting - Is your existing mount heavy enough to support both radios? If not you will need a 2nd mast \ mount. In my case I was able to use the same mast on both ends cabling to the roof for the new radios Downtime to configure port trunking (possibly) Someone with the skill sets needed to assemble the pieces
If you can meet those needs then this can work.
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