Schematic has the current network details
Current Setup (ISP1 is prmary and ISP2 is secondary)
==Doing EBGP with 2 diffrent service providers.
==Both internet links terminated on 2 diffrent routers
==getting default route in BGP from Both service provider
==Default Route received in Internet router is reditributed in OSPF which is running betwene Internet router and L3 switch.Default route from ISP 1 is redistributed without any metric while default route from 2nd isp redistributed with metric so L3 switch has default route towards ISP1
==No IBGP running between both internet router
==owns pool from apnic
Future Requirement(Want to use both service providers at a time)
==want to use both links for outgoing traffic (few networks from ISP1 and few networks from ISP2)
==want to use both links for incoming traffic
what i feel is
==need to run IBGP between 2 internet routers.Only 1 default route will be active probabaly ISP1 using local preference.
==for incoming traffic,i will announce few networks with ISP1 BGP using AS prepend and so that those networks would be preferred over ISP2 and vice versa.
==need ur confirmation on this
===Default route would be preferred over ISP1 using local preference so how i will ensure ISP 2 will also Send outgoing traffic.As i am getting only default route in BGP from both the service providers ,outgoing traffic from 2nd provider seems difficukt.please suggest.