300-510 · Question #29
A network engineer for an ISP wants to reduce the number of iBGP adjacencies. A merge is taking place with another ISP network, so the network engineer needs to make both ASNs look like a single netwo
The correct answer is B. confederation. BGP Confederation (Option B) is the ideal solution because it simultaneously addresses both requirements. A confederation divides a large AS into multiple sub-ASes (confederation member ASes), which reduces the iBGP full-mesh requirement-within each sub-AS, only a partial mesh or
Question
A network engineer for an ISP wants to reduce the number of iBGP adjacencies. A merge is taking place with another ISP network, so the network engineer needs to make both ASNs look like a single network for the Internet. Which BGP technology is most suitable?
Options
- Aroute reflector
- Bconfederation
- Cclustering
- Dpeer group
How the community answered
(62 responses)- A3% (2)
- B82% (51)
- C5% (3)
- D10% (6)
Explanation
BGP Confederation (Option B) is the ideal solution because it simultaneously addresses both requirements. A confederation divides a large AS into multiple sub-ASes (confederation member ASes), which reduces the iBGP full-mesh requirement-within each sub-AS, only a partial mesh or route reflectors are needed, dramatically reducing iBGP adjacency count. Critically, the entire confederation appears as a single AS number to external BGP peers (the Internet), satisfying the requirement that both merging ISP ASNs look like one network. Option A (route reflector) reduces iBGP adjacencies within a single AS but does not address the need to merge two separate ASNs into one apparent AS for the Internet. Option C (clustering) is a component of route reflector design, not a standalone technology. Option D (peer group) simplifies configuration by grouping neighbors with identical policies but does not reduce the number of adjacencies or unify ASNs.
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