300-320 · Question #664
Which statement is true about load sharing when you have a multiple-router network connecting to a single ISP?
The correct answer is D. Load balancing for a specific destination is normally not possible. (D) When multiple routers in your AS connect to the same single ISP, each router learns the same prefixes via EBGP and BGP selects one best path per destination. Since all outbound paths lead to the same ISP, per-destination load balancing is not normally achievable - traffic…
Question
Which statement is true about load sharing when you have a multiple-router network connecting to a single ISP?
Options
- ABGP does load sharing by default.
- BLoad sharing will work only if you have provider-independent space.
- CBetween your local routers, you should have an EBGP session.
- DLoad balancing for a specific destination is normally not possible.
How the community answered
(27 responses)- A7% (2)
- B19% (5)
- C4% (1)
- D70% (19)
Explanation
(D) When multiple routers in your AS connect to the same single ISP, each router learns the same prefixes via EBGP and BGP selects one best path per destination. Since all outbound paths lead to the same ISP, per-destination load balancing is not normally achievable - traffic for any given destination exits via whichever router BGP selects as best. (A) is false - BGP does not load share by default. (B) is false - provider-independent space is about portability, not load sharing. (C) is false - internal routers should use IBGP, not EBGP, to exchange BGP routes internally.
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