Vendor specific packet drop

System Description............................. M4100-26G-POE ProSafe 24-port Gigabit L2+ Intelligent Edge PoE Managed Switch, 10.0.2.30, B1.0.1.1
Machine Model.................................. M4100-26G-POE

Hi Community,

I have this switch used in our organisation LAB. I have to use it to connect a Wifi Bridge to a home gatway.

The Wifi bridge uses a vendor specific protocol to auto discover and connect to the HGW.

My issue is that the packets used for discovery are droped by the switch.

While doing a monitoring, I can see that the packet enter the interface (in) and then disapears (from the intf out)

details of the packet identified by wireshark (Type: unknown):

Frame 437: 111 bytes on wire (888 bits), 111 bytes captured (888 bits) on interface eth0, id 0
Ethernet II, Src: Sagemcom_2d:b4:e0 (24:7f:20:2d:b4:e0), Dst: Spanning-tree-(for-bridges)_ef:03:fe (01:80:c2:ef:03:fe)
Destination: Spanning-tree-(for-bridges)_ef:03:fe (01:80:c2:ef:03:fe)
Address: Spanning-tree-(for-bridges)_ef:03:fe (01:80:c2:ef:03:fe)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
Source: Sagemcom_2d:b4:e0 (24:7f:20:2d:b4:e0)
Address: Sagemcom_2d:b4:e0 (24:7f:20:2d:b4:e0)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: Unknown (0xfe68)
Data (97 bytes)
data 03030485267500800180c2ef03fe247f202db4e0004f53500303008526750080bf68cd57…
[Length: 97]

Any idea why this packet is not forwarded ?

Many thanks in advance