Question : Cisco router question - 2 ISPs

Hello!
My company wants to have 2 paths to the Internet to ensure connection if one ISP fails.
Router2 is administered by ISP1, Router1 is administered by us, both routers are Cisco routers.
Does the configuration below make sense to achieve this?
Is it possible to setup Router1 so that it routes answers to traffic initiated from outside to same ISP as it came from, but does load balancing between ISP1 and ISP2 for traffic initiated from inside? If yes, how do I setup Router1 to do this?


r   o   u   t   e   r   1
    |                |
Router2          ISP2
    |
  ISP1

Answer : Cisco router question - 2 ISPs

You need to configure BGP on the router. For that to work you'll need a public autonomous system number.
Your providers should really help you with the config of your BGP routers with the neighbor statements and their AS numbers. You also need quite a powerful router - recommend Cisco 7200 series router. Full BGP routing table can be up to 35 Mb. You do however not have to pull down the full routing tables. You can configure that you only get default routes and specific other routes, which can reduce the  size of the routing table quite a bit.
I do however reccommend that you get an outside specialist to help you with the configuration. If you do not configure it correctly, you can end up as a "transit autonomous system".  That is basicly where traffic runs down from the one ISP, through your network and out to the other ISP to the destination - using your bandwidth.

some links:
http://www.cisco.com/en/US/products/hw/routers/ps4081/products_configuration_example09186a008009425c.shtml
http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_configuration_guide_chapter09186a00800d97fc.html