The problem was the MSTP. I disable it and now ping works...
Now I added a vlan (1800) on switch n.1 and n.3. On switch n.3 I added also a Vlan-interface for vlan 1800. The ip of the Vlan-interface1800 is 192.168.80.1.
So the switch n.3 has 3 Vlans:
100 tagged and PVID for port 17-20...
Hi to everybody...
I have a problem with 3com switch (2928 sfp)
Switch n.1 (2928) : 2 Vlans:
200 tagged and PVID for port 1-8, 25 (fiber) (192.168.2.0)
400 tagged and PVID for port 24, 26 (fiber) (192.168.4.0)
No Vlan-interface, all ports are set as hybrid
Switch n.2 (2928): 2 Vlans:
100...
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