This is an automated archive.

The original was posted on /r/ubiquiti by /u/mupet0000 on 2024-01-24 11:36:48+00:00.

Hi all,

I’m experiencing a serious fault in my enterprise network that takes the entire thing down. Looking for suggestions on how to tackle this!

I’ve got a third party gateway on 10.255.253.1 with a route to 10.255.253.2. This is as suggested by the Ubiquiti documentation on Layer 3 Routing with UniFi Switches.

The aggregation switch is holding the 10.255.253.2 address on rt_v4040. The issue is that the network completely drops offline based on this IP address becoming unreachable, therefore nothing can be routed as everything goes through the UniFi layer 3 routing.

Hard restarting the aggregation switch temporarily resolves the issue until it randomly reoccurs. Sometimes the aggregation switch restarts itself. I want to remove the aggregation switch from the network entirely to eliminate a hardware fault, but because it’s running the 10.255.253.2 address, the entire network drops when the aggregation switch is disconnected from the network.

According to the documentation, the switch that gets 10.255.253.2 is the first switch that layer 3 routing is enabled on. How can I select another switch to run this address so that I can disconnect the aggregation switch from the network?

Our network is: 10.255.253.1 third party gateway/firewall VLAN4040 intervlan routing on UniFi 10.255.253.2/3/4/5/6 Various other vlans where the router is set in the controller as another switch, not the aggregation switch.

Whatever I’ve tried, the aggregation switch can’t be removed despite no devices being connected to it other than its uplink, as it’s providing this next hop gateway (10.255.253.2) that is required by the network.