I think the first question to ask is why does the business owner want to multi-home? Is it for redundancy purposes or does he want more control of how traffic flows?
This answer will help you to answer some of your questions:
1) If you are only concerned about redundancy, then you might be able to get away with just having two providers give you a default route. This doesn't take up much memory, but it really isn't scalable. Now, if you need to take more than just default routes you probably will WANT to upgrade. I wouldn't do anything more than default routes on a 2821.
2) See above. If you're doing more than default routes then you probably want to upgrade.
3) My favorite router for partial routes (not full routes) would be a 3845 loaded with at least 768 DRAM (1 Gig pref). If for whatever reason you need full routes, bump that router to a 7600.
4) I highly recommend buying a book on best practices. There are many good ones to choose from. You should become familiar with creating filters to protect yourself from becoming a transit site and it is also nice to just learn something about how this works. Especially after you implement it and see 90% of traffic on one link and only 10% on the other (how do you fix?)!
The other wildcard you have in your pocket is your service providers. These guys do this for a living and are usually more than willing to offer some help with configuring it the first time around.
#1 It may if you accept full Internet BGP tables. You'll need lots of RAM and the BGP scanner is often CPU intensive.
#2 If you want to take two full Internet BGP tables, yes.
#3 Depends on bandwidth of links and BGP processing. Had a customer using a pair of 3660s (performance somewhat similar to a 2821) with T3s and two providers taking two full BGP tables. Routers were suffering. Stop taking BGP tables and just defaulted out to both provides, routers ran fine.
#4 Probably not considered best practice, but if you don't overload the router and properly implement security, perhaps doable.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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