when RR are involved additional BGP attributes are present like Originator and Cluster List.
Actually, the cluster-list attribute is used to choice a best path, in this case both Cluster-list are made of a single element but 18.104.22.168 is lower then 22.214.171.124
You can see this as an extension of the criteria that says use the advertisement coming from the device with lowest BGP router id.
In this case becomes pick the advertisement reflected by the RR with the lowest BGP router-id.
What you see is normal and it is the way iBGP works when there are multiple RRs involved.
If you had two clusters each with two RR servers and with their own set of clients, you would a see a client in cluster B receiving only two copies of each BGP advertisement that are those reflected by the primary RR of cluster A instead of four copies.
just to add on why there is no load balancing in this scenario:
actually they are two different reflections of the same original advertisement with the same BGP next-hop (that of the Originator).
There is no actual advantage in installing two copies of the same advertisement.
There are some tricks used with MPLS L3 VPN to be able to install two copies of the VPNv4 routes that is that of using a different route distinguisher on the two PE nodes serving the same VRF site.
In this way RR servers in the middle in the control plane will treat the two set of advertisements as different and both will be propagated within the domain.
•1. BGP route 126.96.36.199 learned from R1 is best path in R2’s Routing table because of R1’s lower advertising BGP RID.
•2. After “R2(config-router)#maximum-paths 2”, both routes are installed in R2’s Routing table.
•3. If these 3 are IBGP routers, after “R2(config-router)#maximum-paths ibgp 2”, both routes are installed in R2’s Routing table.
Experiment 2: with RR
These 2 paths meet equal-cost load balancing’s 3 conditions. Even though “R5(config-BGP)#maximum-paths IBGP 2” is configured, equal-cost load balancing still does not happen. So RR kills equal-cost load balancing.
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