300-410 Question 145
Single answerYou are configuring a BGP Route Reflector (RR) in your network to simplify the BGP full-mesh requirement. The Route Reflector has two clients, ClientA and ClientB. ClientA advertises a BGP route to the Route Reflector. What will the Route Reflector do with this route, assuming default behavior and correct configuration?
- A
The Route Reflector will advertise the route to all non-client peers only.
- B
The Route Reflector will advertise the route to all clients, including ClientB, but not to non-client peers.
- C
The Route Reflector will advertise the route to all clients and non-client peers.
- D
The Route Reflector will not advertise the route to any peers by default.
Show answer and explanation
Correct answer: C
Explanation
In BGP, a Route Reflector simplifies the iBGP full-mesh requirement by allowing routes learned from a client to be advertised to other clients and non-client peers. This is the default behavior of a Route Reflector, provided no additional route policies or configurations block the route advertisement. This behavior reduces the need for a full-mesh of iBGP sessions in large networks.
- A. Incorrect.
Incorrect. A Route Reflector advertises routes learned from clients to both other clients and non-client peers, not just non-client peers.
- B. Incorrect.
Incorrect. A Route Reflector advertises routes learned from clients to both other clients (like ClientB) and non-client peers, as long as policies permit.
- C. Correct.
Correct. A Route Reflector advertises routes learned from one client to both other clients and non-client peers by default, simplifying the full-mesh requirement in iBGP.
- D. Incorrect.
Incorrect. By default, a Route Reflector advertises routes learned from its clients to other peers (both clients and non-clients), assuming policies and configurations are properly applied.