Instant On - Wired

Hi, I have a very strange problem between two switches, let me introduce it.

I have two switches connected together:

• Switch A: HPE Networking Instant On 1830 24-port Gigabit PoE (JL813A)

  • Management IP: 10.20.30.10/24

• Switch B: HPE Networking Instant On 1930 48-port Gigabit (JL685A)

  • Management IP: 10.20.30.11/24

Both switches use VLAN 1 as the management VLAN.
The default gateway for management is 10.20.30.1/24.

The uplink is configured as follows:

• Switch A, port 23 → connected to Switch B, port 48.

• On both ports, VLAN 1 is untagged, and VLANs 4–6 are tagged.

• The PVID is set to 1.

• Other access ports are configured correctly (for example, VLAN 6 untagged for LAN devices, VLAN 5 untagged for external devices, etc.).

The problem

• On Switch B, the management interface (10.20.30.11) is isolated:

  • From Switch A (10.20.30.10), I cannot ping 10.20.30.11.

  • From Switch B itself (using the built-in ping tool), I cannot ping either the gateway (10.20.30.1) or Switch A (10.20.30.10).

• However, if I connect directly to Switch B with a PC on a port untagged in VLAN 1, I can ping and manage it locally.

• LLDP between the two switches works fine:

  • On Switch A, port 23 correctly shows Switch B (port 48) with its chassis ID and management IP (10.20.30.11).

• All the tagged VLANs (4–6) work perfectly across the trunk: devices in those VLANs communicate without issues.

• Only the management VLAN (VLAN 1) is not working across the trunk.

What I've already checked

• PVID = 1 on both uplink ports.

• Acceptable frame type = All.

• Ingress filtering = Enabled.

• Firmware updated to the latest available versions on both switches.

• Default gateway is configured correctly on both switches (10.20.30.1).

• From Switch A, I can ping the gateway (10.20.30.1) without any issue.

Could it be a bug or something? Thank you for support.