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Side note... wont cdp only show directly connected cisco devices??? if the routers are all connected to a L2 switch why would any be cdp neighbors... wouldnt they be neighbors of the L2 switch, which in this case is a 3COM...
to create tunnel between sites you need to use public addresses assigned by ISPYou can not create a tunnel between sites using 10.x.x.x or 192.168.x.x etcI believe there is a way to use the asa 5505 as termination and use DDNS and outside address pro...
How about L3 P2P links from access to core and a routing protocol to provide load balancing and redunancy ?? A properly configured routing protocol will provide better convergence times than STP and will alow for true load sharing....