This route map is using the tag to avoid redistributing routes which have already been redistributed (which would contribute to a routing loop). The first instance in the route map says that if a route has a tag with value 41 then it should be denied redistribution. The second instance in the route map redistributes routes and assigns the redistributed route a tag with value of 41.
You will not find these tags anywhere else in the configuration. The tags are only used within the route map.
In BGP routes are tagged with most recent AS number but when redistributing into OSPF the tag is maintained.
So the first sequence of your route-map will not redistribute the routes having the tag 41 so announced by AS 41 and the second sequence will tag all the other BGP routes when redistributing them into OSPF. Are you multihomed? If not then you won't have any routes into OSPF if next hop is AS 41 and if you are then you will redistribute only routes from one ISP only.
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