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STP configuration issue

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http://serverfault.com – Having a strange issue with STP that I cannot seem to pin down with the following topology: -------881 ------- Public WAN ----- 881--- Switch1 Swith2 --------2911--------Private leased line---- provided by isp I am trying to extend a layer 2 network between two remote sites, the two bottom routers are cisco 2911's connected through a leased line from the ISP. The two routers at the top are cisco 881's connected over an encrypted VPN tunnel over public WAN. The 881 link is supposed to serve as a ba (HowTos)