Do you have spanning-tree enabled on your network?
Do you see this loop in just one VLAN/one port? Or do you see other issues in your network?
In Aruba Central, you should be able to see the topology of your network, unfortunately the visibility probably includes the first non-Central-managed switch, but not beyond that. Network loops also tend to generate high port/link utilization, what may show up as an alert in Central.
If you can run a packet capture on the virtual server (Wireshark, tcpdump, etc), you may see the traffic coming back with the IP you want to assign, and it's MAC address. In other switches, you may check the mac-address table on which ports you see that MAC address and find out the source.
Looping back may happen if you configure a redundant link (port-channel, LAG, LACP) but only on one side of the link. It may even be your hypervisor connected to the network redundantly.
------------------------------
Herman Robers
------------------------
If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check
https://www.arubanetworks.com/support-services/contact-support/ for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.
In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.
------------------------------
Original Message:
Sent: Jul 22, 2024 12:56 AM
From: Rhap4Boy
Subject: Troubleshoot possible loops in the network
We have a mixed Cisco-Aruba network. There seem be a strange issue in one section of the network where one virtual server no matter what IP address I change it to, it tells me its a duplicate IP address.
I am thinking there may be a loop? What is the proper way to add bpdu-guard, loop-guard, and root-guard to an existing network to help detects loops within the network?
Can Aruba Central help with this issue?