Thursday, October 15, 2020

BGP out of path route reflectors

Question for those of you who run out of path route reflectors, perhaps on server hardware, like this guy:

https://archive.nanog.org/sites/default/files/2_Tinka_21st_Century_iBGP_Route_Reflection.pdf

How do you ensure the route reflectors stay out of the data path?

My own thought, given that the inter AS traffic is actually governed by the IGP is to make the router reflectors as undesirable as possible in the IGP. So for OSPF I'd put the RRs in their own area, since the only transit area is area 0, no "transit" traffic will ever pass through a non-backbone area. Another option I can think of is to redistribute the RR loopbacks since that's less preferred by any routing protocol.



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