Difference Between 802.1D and 802.1W TCN

Brothers,

Can you tell me if there is any difference in TCN propagation between 802.1d and 802.1q.

Many Thanks,

Comments

  •  

    ashse,

     

    802.1d:

    A TCN generated and sent to the root switch.

     

     

     

    802.1w:

    The originator of the TCN immediately floods this information to everyone.

     

    To everyone!

    http://www.youtube.com/watch?v=GYWU1fN2D6o

     

  • brother,

    Thanks for EVERYONE vdo [;)]

    So it means 802.1d, sends TCN only through Root Port. However, 802.1w, sends through all ports (Alt port, DP and RP), please support....

  •  

    STP (.d)

    TCN goes through Root port. TC goes through designated port. Once TC is received aging time is set to 5 sec for next 35 sec.

     

     

    RSTP(.w)

    When root/designated port goes to FWD state and that port is not Edge port then

    { (1) All entries in Filtering database learned through other ports on this 

    bridge are flushed. (2) Root and Desig ports on this bridge set TC in their RST BPDU. Root port also sends RST BPDU in this case.

    }

    Once RST BPDU is received with TC on Root/Desig port

    { (1) All entries in Filtering database learned through other ports on this 

    bridge are flushed. (2) Root and Desig ports on this bridge set TC in their next tx RST BPDU. Root port also sends RST BPDU in this case.

    }

    RST bpdu, having TC set, received on ALT/BKP port doesn't do further processing on TC.

    There is no TCAck in RSTP so TC is set in 2 successive RST BPDUs. 

     

Sign In or Register to comment.