IGP into BGP :
1) BGP automatically copies IGP metric to BGP
2) Origin attribute (LINK) will change to "?" - incomplete
3) Will not redistribute OSPF external by default.
BGP is not redistributing OSPF ext because of loop prevention. If some prefix has been redistributed before from BGP int OSPF they will appear as OSPF ext, redistributing them back again into BGP will cause loops. This is default set up. To change that you need to configure
router bgp X
redistribute ospf Z match internal external
4) Sets weight attribute to 32768
BGP into IGP
To be honest I have never seen this kind of redistribution in practice. And that logical because there is no IGP who can handle (at this moment 16.09.2016) 655782 prefixes!
BTW here we can check what is current status of BGP table :
http://bgp.potaroo.net/index-bgp.html
and history of BGP table- this one is very impressive!
source :
http://bgp.potaroo.net/
Back to the point:)
If you will ever do redistribution from BGP into IGP (e.g OSPF, EIGRP) you will do this in laboratory environment.
You need to remember about one big rules :
1) By default only eBGP routes are redistribute into IGP
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