Thanks very much , it helped me out 

> Subject: Re: [c-nsp] REP and Spanning-Tree
> From: [email protected]
> Date: Tue, 3 Mar 2015 11:02:20 -0500
> CC: [email protected]
> To: [email protected]
> 
> See the last two pages of this white paper: 
> http://www.cisco.com/c/dam/en/us/products/collateral/switches/me-3400-series-ethernet-access-switches/prod_white_paper0900aecd806ec6fa.pdf
> 
> - Ed
> 
> 
> 
> On Mar 3, 2015, at 09:39, M K <[email protected]> wrote:
> 
> I have the below topology 
> SW1 -- SW2 -- SW3SW1 and SW2 already ar part from a ring that is running REP 
> (i.e. no spanning -tree on the link between SW1 and SW2)No , I got a new 
> switch (SW4) and connect it to SW1 and SW3 (which means I have now closed 
> circuit)My questions is , would that be an issue? 
> SW4 -STP- SW1 - REP - SW2 -STP - SW3 - STP - SW4
> Thanks                         
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