Broadcasting problem

[Rashmiranjan jena]

Dear Friends,

in my cisco 3560  switch all network are connected.one attendance device also connected with this switch ,some  days befor it made a big problem

when i am disconnecting that device my network is working fine and when i am connecting it's making problemand network is down

how to break that problem,please suggest

port confuguration is

int f0/1

switch mode aceess

switch port access vlan 142

spannig tree port fast

spanning tree bpdugard enable

[hdevarajan]

Hi Rashmiranjan

Depends on the type of device you are connecting to that port. You should use port fast only for edge ports i.e PC, laptop, etc. If it is another switch or using some form of switching, then it is not an edge port and you should not configure port fast on it. Remember using port fast doesnt mean you dont see BPDU's. All it does is move to forwarding immeiately and device presence or absence doesnt trigger topology change (TCN)

[devils_advocate]

Can you elaborate on the symptonms of the issue?

What type of device are you plugging in?