300-320 · Question #80
Which two options improve BGP scalability in a large autonomous system? (Choose two.)
The correct answer is A. route reflectors C. confederations. In a large BGP autonomous system, the full-mesh IBGP requirement is the primary scalability bottleneck. Route reflectors (A) solve this by allowing a central RR router to reflect routes to all clients, eliminating the need for every router to peer with every other router…
Question
Which two options improve BGP scalability in a large autonomous system? (Choose two.)
Options
- Aroute reflectors
- Broute redistribution
- Cconfederations
- Dcommunities
How the community answered
(31 responses)- A90% (28)
- B6% (2)
- D3% (1)
Explanation
In a large BGP autonomous system, the full-mesh IBGP requirement is the primary scalability bottleneck. Route reflectors (A) solve this by allowing a central RR router to reflect routes to all clients, eliminating the need for every router to peer with every other router. Confederations (C) split the AS into multiple sub-ASes with EBGP-style peering between them, reducing the full-mesh requirement to within each smaller sub-AS. Route redistribution (B) does not address IBGP mesh complexity and can introduce instability. BGP communities (D) are a useful traffic-engineering tool but do not reduce the number of required BGP sessions or improve mesh scalability.
Topics
Community Discussion
No community discussion yet for this question.