If you want to redistribute from one process into another you can do something like:
router ospf 1
network 10.10.10.0 0.0.0.255 area 0
redistribute ospf 2 subnets
router ospf 2
network 10.10.20.0 0.0.0.255 area 0
redistribute ospf 1 subnets
Is this what you wanted or was it something else you were looking for?
You must be very careful however if you have more than one router doing this, as without careful filtering you could end up redistributing a redistributed route and end up in a routing update loop, which could cause major routing issues.
When reditributing between different OSPF processes in multiple points on the network, it is possible to get into situations of subobtimal routing or even worse, a routing loop. To prevent this you need to you need to make the routes learned via OSPF 1 will always be preferred over external routes redistributed from OSPF 1 into OSPF 2
It depends greatly upon the subnets that are in use, their source (external / internal etc) and also if you are doing any summarisation. For example if you have a summary route from one AS which happens to mask a route in the second AS, you can end up in a right mess without distribute and redistribute filters.
If your network is nice and clean, you can probably get away with just prefering one over the other - then the re-redistribution protection comes from tha fact that a route that you redistributed wouldn't make its way into your RIB.
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