I am configuring a site to have 2 4507's running HSRP and would like to connect the 3745 to both switches. I also have a 1721 that connects to a dsl line for backup wan purposes that I run HSRP between it and the 3745. How would I go about configuring the 3745 to connect to both switches as well as take into account the HSRP setup w/ the 1721?