EFM frames on tagged port

Discussion in 'Cisco' started by Mark, Jan 6, 2012.

  1. Mark

    Mark Guest


    Reading the specs I didn't completely understand if EFM, CFM or LLDP frames
    can be tagged or not. Specifically, what is the behavior of a L2 switch when
    sending out such frames out a trunk port, i.e. the frames are supposed to be

    I understand that slow protocols use reserved destination multicast
    addresses , i.e. 01:80:c2:x:x:x and by standard they are not supposed to
    propagate the 802.1d bridge - so does this mean that bridge software *must*
    treat such frames specially and do not tag/untag them at all?


    Mark, Jan 6, 2012
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