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Redundant Routing between Cat6509 and 3550 - Private Fiber and ATM

We are in the process of converting our network switches from another manufacture to Catalyst switches. The problem comes from the fact that we have a six-leg ATM cloud connecting all locations and utilizing RIP. We have had private fiber installed between two of the locations and would like to utilize Gigabit Ethernet between the two locations and maintain the ATM as a backup. Obviously the four remaining locations will still only have the ATM connections. So what would be the best routing protocol to implement? Keeping in mind we will have a 6509 at the core, a 3550-12G on the other end and 2600s are routing the ATM.

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Re: Redundant Routing between Cat6509 and 3550 - Private Fiber a

Since you are already running RIP, you can continue to use RIP and manipulate the metrics using the 'offset-list' command to prefer the Gigabit link over ATM. Otherwise, the routing protocol that you opt is transparent to the change that you are planning. Ofcourse, you can weigh the advantages and disadvantage of each protocol and choose the one appropriate for your environment.