Please see diagram attached, I have a scenario where i have dual CE-PE configuration and need to enable mutual redistribution between BGP and OSPF. My concern is with routes being redistributed into OSPF from BGP and being re-advertised/redistribute
d back into BGP at the other CE.
I'm guessing I will have to configure some kind of filtering to prevent routes learnt via BGP being redistributed back in. I also understand this can be achieved with route tagging.
Can someone point me to some documentation/ links on the configuring route tagging to prevent loops in this scenario?