If you are not going to form the loops you can turn the Spanning Tree
off. But if you connect a hub or a switch or something you are not going
to switch on/off very often, there's no point. You connect the hub to
the switchport, you wait 30 seconds, you forget about it forever.
Conecting/disconnecting stations to the hub doesn't bother the switch's
spanning tree, the switch port is still sniffing the hub's heartbeat and
stays in the forwarding state.
/felis
John Chang wrote:
>
> In the below website it says not to have portfast on if you connect
> switches, hubs, or routers. I understand that point but what if a user
> connected a mini-hub (Ex. Linksys EtherFast 8-Port 10/100 Desktop Hub)
> or unmanaged mini-switch (Ex. Farallon NetLINE 10/100 switch) so that he
> could connect multiple computers. Would this cause any problems? Thank you!
>
> http://www-1.cisco.com/warp/public/473/12.html
>
> Note: The portfast feature should never be used on switch ports that
> connect to other switches, hubs, or routers. These connections may cause
> physical loops
> and it is very important that spanning tree go through the full
> initialization procedure in these situations. A spanning tree loop can
> bring your network down. If portfast
> is turned on for a port that is part of a physical loop, it can cause a
> window of time where packets could possibly be continuously forwarded (and
> even multiply) in
> such a way that the network cannot recover.
>
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