Connection problem between Meraki switch and Ubiquiti switch

[JAEspinosa1]

Client has connected some ubiquiti switches behind some of our switches, for a few days the ubiquiti switches have been out of service; the ITX port between our Meraki SW and the Ubiquit SW is in open mode, VLAN 10. Access mode BDGUARD disabled Before this problem, from the Meraki switch we saw the Ubiquiti SW and it responded to ICMP, now it does not respond, it is out of service I have captured traffic and I see the following

17:49:33.676854 ARP, Request who-has 10.51.222.1 (ff:ff:ff:ff:ff:ff) tell 10.51.222.189, length 46 17:49:33.677679 ARP, Reply 10.51.222.1 is-at cc:03:d9:fe:7d:1d, length 42 17:49:34.690315 ARP, Request who-has 10.51.222.1 (ff:ff:ff:ff:ff:ff) tell 10.51.222.189, length 46 17:49:34.691005 ARP, Reply 10.51.222.1 is-at cc:03:d9:fe:7d:1d, length 42 17:49:35.615940 IP 10.51.222.189.43111 > 255.255.255.255.10001: UDP, length 222 17:49:35.700438 ARP, Request who-has 10.51.222.1 (ff:ff:ff:ff:ff:ff) tell 10.51.222.189, length 46 17:49:35.700610 ARP, Reply 10.51.222.1 is-at cc:03:d9:fe:7d:1d, length 42 17:49:35.792550 ARP, Request who-has 10.51.222.189 tell 10.51.222.1, length 42 17:49:36.710403 ARP, Request who-has 10.51.222.1 (ff:ff:ff:ff:ff:ff) tell 10.51.222.189, length 46 17:49:36.711196 ARP, Reply 10.51.222.1 is-at cc:03:d9:fe:7d:1d, length 42 17:49:37.720598 ARP, Request who-has 10.51.222.1 (ff:ff:ff:ff:ff:ff) tell 10.51.222.189, length 46 17:49:37.720775 ARP, Reply 10.51.222.1 is-at cc:03:d9:fe:7d:1d, length 42

In this attached line is when the computer stops responding

17:49:35.615940 IP 10.51.222.189.43111 > 255.255.255.255.10001: UDP, length 222

Do you know if there is any incompatibility problem after updating the firmware of the Meraki switches with the Ubiquiti switches? This was working Is there any known error?

If we connect a Ubiquiti AP to the same port, it gets the IP via DHCP and works ok, and we reach it via ICMP ok,

We connect the Ubiquiti switch and the connection drops, we do not reach it via ICMP,
When capturing packets we see the IP of the switch connected to the port,
but after a short time we think that the Ubiquiti switch is blocked and no longer responds.

The Meraki port is in access mode,
without RSTP
without bdpuguard

[DarrenOC]

hi @JAEspinosa1 , tongue in cheek here but I would do the following:

- shutdown the link to the Ubiquity

- Power down the Ubiquity Switch

- Unrack the Ubiquity.

- replace switch with anything other than Ubiquity 

[JAEspinosa1]

Everything has been done except changing the ubiquiti sw for another one from another model

The problem is that this has suddenly stopped working,
we have 7 ubiquiti sw connected to meraki sw and none of them work
that's what's strange to me, that none of them work suddenly

[PhilipDAth]

What does the Ubiquity switch log report?

Have you configured the spanning tree priority on your switches to make sure they are the spanning tree root?

https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Configuring_Spanning_Tree_on_Meraki_...

[JAEspinosa1 · Accepted solution]

Good afternoon, the problem was located in the Ubiquiti controller blocking the communication port between the controller and the switch, leaving it blocked.