Re: why the limit of 9 daisy chained 3550 switches?
The limit of 9 switches, is ONLY for Catalyst switches connected using the GigaStack GBICs in a half-duplex cascaded stack configuration. That is to say, if you use both ports on the single GS GBIC to connect to neighboring switches in the stack.
If you use GS GBICs to do point-to-point connections inexpensively, or you use any of the other GBICs to do point-to-point connections, then the limit of 9 switches does NOT apply. You can daisy-chain as many as you want, at least in theory. In practice, however, other considerations may compel you to limit how many you choose to connect in this manner.
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