Refer to the exhibit. After configuring the BGP network an engineer verifies that the path between Server1 and Server2 is functional. Why did RouterSF choose the route from RouterDAL instead of the route from RouterCHI?
A.
BGP is not running on RouterCHI
B.
There is a static route in RouterSF for 10.0.0.0/24
C.
The route from RouterDAL has a lower MED
D.
The Router-ID for Router DAL is lower than the Router-ID for RouterCHI
the real answer is the oldest route. The oldest route is the step 10 and the Router IS is step 11. Ref: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html
When a NEW path is learned, and the new path has all identical path attributes, the CURRENT BEST path remains as "best". The idea is the current path is likely more stable than the path which was just learned. (oldest path)
When a CURRENT best path is forgotten/lost, then among the REMAINING paths, the next chosen "best" path is the one from the BGP speaker with the best Router ID -- the age of the remaining paths are not considered.
The "prefer oldest path"only applies when a new path is learned, not when an best path is forgotten and the speaker is picking among remaining paths.
The answer should be the the oldest path is via RouterDAL
You are correct, the below path was first learned, and then the above path.
Oldest path method is not included in We Love Orange As Orange Mean Refreshment, so I understand why D is the answer here.
All things being the same, we see that DAL has the lower router ID. C does not make sense, as the med value is stripped when crossing AS's and is only useable for iBGP peers.
MED can be advertised from an outside AS to the AS to choose the path out. Like Localpref chooses the path out from within. In this context MED makes sense, but we don't have that information, so the next choice is lower RID, because it is assumed lower RID = more stable topology
I agree with the answer you chose, but regarding MED, you might be wrong. MED is non-transitive. But you can use it between ASes. Only, the AS which received the MED, cannot forward it to another AS.
MED has local meaning only (hence, its a Cisco attribute, not RFC attribute), its is LOCALPREF that can be redistribuited
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