RT-AC87U: robocfg causing router restart

[Tsun]

I have an RT-AC87U, which I'm quite happy with, even though I know it's an older device. I've attempted to configure it to use VLANs, following https://www.snbforums.com/threads/f...guest-network-for-asus-merlin-rt-ac68u.18969/

However, whenever I try to run a robocfg vlan command after about 20-30s router restarts. At first I suspected I might be making some kind of mistake, but I also tried command that shouldn't change anything, and it also triggered a reboot:

login@RT-AC87U:/tmp/home/root# robocfg show
Switch: enabled
Port 0: 1000FD enabled stp: none vlan: 2 jumbo: off mac: 00:17:10:91:f4:0b
Port 1: 1000FD enabled stp: none vlan: 1 jumbo: off mac: 5c:26:0a:57:ed:7c
Port 2: 1000FD enabled stp: none vlan: 1 jumbo: off mac: 30:85:a9:94:a1:f0
Port 3: 1000FD enabled stp: none vlan: 1 jumbo: off mac: e4:b9:7a:a8:4e:11
Port 4: DOWN enabled stp: none vlan: 1 jumbo: off mac: 00:00:00:00:00:00
Port 5: 1000FD enabled stp: none vlan: 1 jumbo: off mac: d0:17:c2:b0:07:04
Port 7: 1000FD enabled stp: none vlan: 1 jumbo: off mac: d0:17:c2:b0:07:00
Port 8: 1000FD enabled stp: none vlan: 1 jumbo: off mac: d0:17:c2:b0:07:00
VLANs: BCM5301x enabled mac_check mac_hash
1: vlan1: 1 2 3 5 8t
2: vlan2: 0 8t
login@RT-AC87U:/tmp/home/root# robocfg vlan 1 ports "1 2 3 5 8t"
login@RT-AC87U:/tmp/home/root# robocfg show
Switch: enabled
Port 0: 1000FD enabled stp: none vlan: 2 jumbo: off mac: 00:17:10:91:f4:0b
Port 1: 1000FD enabled stp: none vlan: 1 jumbo: off mac: 5c:26:0a:57:ed:7c
Port 2: 1000FD enabled stp: none vlan: 1 jumbo: off mac: 30:85:a9:94:a1:f0
Port 3: 1000FD enabled stp: none vlan: 1 jumbo: off mac: e4:b9:7a:a8:4e:11
Port 4: DOWN enabled stp: none vlan: 1 jumbo: off mac: 00:00:00:00:00:00
Port 5: 1000FD enabled stp: none vlan: 1 jumbo: off mac: d0:17:c2:b0:07:04
Port 7: 1000FD enabled stp: none vlan: 1 jumbo: off mac: d0:17:c2:b0:07:00
Port 8: 1000FD enabled stp: none vlan: 1 jumbo: off mac: d0:17:c2:b0:07:00
VLANs: BCM5301x enabled mac_check mac_hash
1: vlan1: 1 2 3 5t 8t
2: vlan2: 0 8t
[reboot occurs]

I'm running the latest 3.0.0.4.382.52545 firmware, I've also tried Merlin 384.13_10 but it had the same issue. Any idea what might be causing this? My config is nothing unusual, router mode, 2,4/5 GHz access points, guest network disabled, AiProtection/AiCloud/firewall/QoS disabled.

 

[L&LD]

Have you ever fully reset your router? And then minimally and manually configure it afterward without using a saved backup config file?

 

[Tsun]

Yes, I've done hard factory reset, reconfigured the router, and the problem still occurs.