Same Cluster-ID
RRs A and C have the same Cluster-ID
C will deny routes reflected from A due to cluster-list loop detection
If session from C to D fails, C will not be able to reach 10.0.0.0/8
If session from B to A fails, B will not be able to reach 10.0.0.0/8
D has some redundancy, but not 100%
Lines Represent Both Physical
Links and BGP Logical Connections