MED Churn
A
F
G
AS Y
MED 0
AS X
AS Y
MED 1
C
D
B
E
SubAS 65000
SubAS 65001
SubAS 65002
2
3
10
2
40
40
MED in a RR or Confederation environment can cause an endless convergence loop
Happens as a result of two things:
RRs and Confeds “hide” path information
MEDs are only compared among like Neighbor ASs
Two types of “The Churn”
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