| With below setting I was able to run the test on all 4 devices Message Age = 19 (encoded as 0x13 0x00) Max Age = 20 (encoded as 0x14 0x00) Hello Time = 255 (encoded as 0xFF 0xFF) Forward Delay = 255 (encoded as 0xFF 0xFF) The results are: Linux bridge: Accepting the new BPDU and accepting all fields as it is given above. Netgear: Not accepting the BPDU, advertising its own with values message age:0, max age: 20, hello time :2 and forward delay 15 Dlink: Not accepting the BPDU , advertising its own with values message age:0, max age: 20, hello time :2 and forward delay 15 Cisco: Not accepting the BPDU, advertising its own with values message age:0, max age: 20, hello time :2 and forward delay 15. In Cisco the configuration is 2950#show spanning-tree summary Root bridge for: VLAN0001. Extended system ID is enabled. PortFast BPDU Guard is disabled EtherChannel misconfiguration guard is enabled UplinkFast is disabled BackboneFast is disabled Default pathcost method used is short Name Blocking Listening Learning Forwarding STP Active ---------------------- -------- --------- -------- ---------- ---------- VLAN0001 0 0 0 2 2 ---------------------- -------- --------- -------- ---------- ---------- 1 vlan 0 0 0 2 2 ====================================== So for the given values except linux all switches are dropping/ignoring the packet. Regards, Sujata --- On Mon, 6/18/12, Vitalii Demianets <vitas@xxxxxxxxxxxxxxxxx> wrote:
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