[isp-bgp] _newbie_ question regarding addresses and routing

[Tomas Bonnedahl <tomas@...]

i was wondering if public routable address (in the core) is a requirement 
when using bgp?

im really just interested in loadbalancing between the two operators 
during normal operation and a failover to the other operator if one
would fail. 

i do not have enough public address to cover the core, although i dont 
know if the EGP routing would involve the core router and hence, perhaps
dont need public addresses in the core.
i know of ospf too, but read that it "should" be used under one AS entity, 
not upstream, nor do i know what the ISPs policy is of using ospf to
customers.

i dont own an ASN, the solution i was thinking about would be to have
private address in the core and run iBGP/ospf there and use a private
ASN and run BGP between my border routers and the isps access routers.


i have a setup that looks like this:


		ISP A				 ISP B
		   |				   |
		   |				   |
     	     [IBUS-BORDER1]		     [IBUS-BORDER2]
		    \				 /
		     \                          /
		      \			       /
		       \		      /
			\ --- [IBUS-CORE]--- /
				   |
				   |
			          LAN


any hints/directions/bgp or ospf config samples/complete answers would be
appricated.



thank you,
tomas bonnedahl

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