BGP between HQ and branches?


I have lab question: I have enterprise with private AS number and have HQ and three branches in 4 differnet countries. I have to use BGP to interconnect all branches to HQ and between themselves but without using full mesh configuration. Offcourse, every location has two ISP for Internet access. Every location has /24 public IP range.

Do I have to usa iBGP if I have one AS for enterprise? what is the right way to do it?

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At HQ and Sites use same Private AS number , make neighbor ship with ISP( whatever AS it is using as remote AS ).

Now use feature Allow AS in on all sites to receive routes of other site.