The center router is running 3 routing protocols: OSPF process 1, OSPF process 2, and RIPv2.
I'd like to perform mutual redistribution among these 3 protocols. Do I need to use route-maps to set tags and then redistribute based on the tags, to prevent potential route feedback? Is there a possibility of routing loop in this topology?
You have a single point of route-redistribution, therefore there won't be any route feedback from any other routing protocol.
You can use the route-map concept for better control of the routes or a simply redistribute [protocol] would do. Don't forget to include the metric from each protocol when performing the redistribution.
It is always a good practice to define the metric when redistributing into OSPF. The default of 20 is the seed metric applied when no metric is defined exclusively except for BGP in which casde it is 1
Metric type can be controlled during redisribution in the following way
redistribute BGP 1 metric 10 metric-type
If you configure the redistribution of OSPF into BGP without keywords, by only OSPF intra-area and inter-area routes are redistributed into BGP, by default
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