I have come up with two BGP configuration for two border routers 6506 with two different ISPs, Multihomed. I have made it to recice default routes from both ISPs and advertise our blocks out to them and do load sharing at the same time plus redundancy in the event one ISp connection is down.
I have attched both files with the IPs half deleted! My time is very short, i.e. tomorrow or just today (Its 4:15 a.m. now!) and need to see if I have done alright. I have used IP prefix-list.
Also, I have a block with /21 mask and /20 mask and blocks with /20 and /19 (which is good for redundancy) I don't know if I have to break the /21 or it is OK as I have already listed in the Ip prefix-list statements.
/20 must be a sub-set of /21 and this is how Ihave thought about it!