peering between route reflectors

[Benoit Chesneau]

For redundancy I am thinking to have a router reflector per pop . Each route reflector would peer with each others. The issue is that since each POP has a transit, i have duplicate route and sometimes a loop is created. How can it be prevented?? I tried to put them in the same cluster but it doesn't seem to be enough. 

Any idea is welcome :)


Benoît