An IP fabric with EBGP configured in the overlay uses a different AS number for each node in the fabric. Which two benefits does this configuration have over using a single AS scheme? (Choose two.)

The correct answer is B. It avoids the use of route reflectors. D. It provides more efficient BGP path selection. Using a different AS number for each node in an EBGP overlay eliminates the need for route reflectors since EBGP inherently prefers routes learned from external ASes over internal routes, ensuring efficient route propagation without additional configuration. This setup also…

Underlay Networks

Question

Options

AThere are fewer BGP peers.
BIt avoids the use of route reflectors.
CThere is more TCAM space for AS numbers.
DIt provides more efficient BGP path selection.

How the community answered

(22 responses)

A
14% (3)
B
82% (18)
C
5% (1)

Explanation

Using a different AS number for each node in an EBGP overlay eliminates the need for route reflectors since EBGP inherently prefers routes learned from external ASes over internal routes, ensuring efficient route propagation without additional configuration. This setup also enhances BGP path selection by leveraging AS_PATH attributes to prevent routing loops and ensure optimal traffic flow across the fabric.

Topics

#EBGP#per-AS design#route reflectors#BGP path selection

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