I'm doing the same thing because we are using BGP between our two ISPs. I don't believe the PIX supports multiple IPs on a single interface. You'll be routing two seperate subnets and only one will be part of the subnet that the outside interface of the PIX is part of. For the other subnet you need to put a static route in the router that points to the outside PIX interface. Then within the PIX you'll route that subnet to the appropriate place on your network, like another router perhaps.
Both links are full T1s. We are not implementing any load balancing via software or hardware, although depending on the destination of the inbound packets, the ISPs make weighted determinations as to which path the data will flow. That's part of what the BGP protocol does. Our purpose was link redundancy. But unles you have completely seperate circuits coming into your facility from different directions or locations you're still pretty vulnerable to something like a cable cut.
No, you can't run BGP without an AS number because that's what identifies you with and to the peers. Also, the commands within the PIX specifically refer to your AN number and those of your peers. Your ISP should be able to help you with the registration and there's plenty of info at arin.net.
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Question I am currently unable to specify "crypto keyring" command when
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