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Stacking issues -> STP

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Sep 21st, 2006
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Hi guyz, i'm wondering about the stp issues for stacking. i got 2 switch and they are stacked, and i also pull a UTP cable to connect this 2 swtich as a uplink trunk port.


1)Am i goin to face STP looping issues in this scenario?


2)theoretically, STACKING is logically combines 2 switches to form a logical switch. So ther should'n have looping issue in the scenario, am i rite ?



Thanks in millions


William

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Aaron Harrison Thu, 09/21/2006 - 05:45
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Hi


It depends a lot on what stacking technology you are using...


If you have 3750s with the stackwise connectors, then you effectively have a single switch... You also wouldn't need the extra UTP cable as the stackwise connectors form a redundant ring topology...


Regards


Aaron


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william2u Sun, 09/24/2006 - 18:40
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but what if customer accidentally connect a a extra UTP cable ?

Aaron Harrison Mon, 09/25/2006 - 03:04
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Hi


In that case the switch will see the BPDUs (it's own BPDUs actually) and will then put the port into spanning-tree blocked state to break the loop.


Regards


Aaron


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