Hello
When performing mutual redistribution at dual redistribution points, you could indeed incur loops in the network.
As stated by others using route tags to permit and deny is a good way of negating such issues specifically between two differing IGPs, but when you have and BGP/IGP redistribution I would say a good way would to incorporate BOTH route tags and BGP attributes.
This would mean setting route-tags to BGP redistributed routes into OSPF and Community attributes to redistributed OSPF routes into BGP.
Example:
bgp - 179
ospf- 89
ip bgp-community new-format
ip community-list standard OSPF-TAG permit 100:89
route-map bgp-ospf deny 10
match community OSPF-TAG
route-map bgp-ospf permit 100
set tag 179
route-map ospf-bgp deny 10
match tag 179
route-map ospf-bgp permit 100
set community 100:89
router bgp xx
redsitribtue ospf route-map ospf-bgp
router ospf
redsitribtue bgp route-map bgp-ospf subnets
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Kind Regards
Paul
