What is the purpose of the confederation identifier in a BGP confederation?

The correct answer is D. It identifies the autonomous system that belongs to the confederation. In BGP confederations, the confederation identifier represents the external AS number for the entire confederation. The BGP confederation splits a single large autonomous system (AS) into smaller, manageable sub-ASes. These sub-ASes use private AS numbers internally but appear…

Core Routing

Question

Options

AIt reflects the route reflector cluster ID within the confederation.
BIt carries the AS number within the confederation's local autonomous system.
CIt advertises routes outside of the confederation's autonomous system.
DIt identifies the autonomous system that belongs to the confederation.

How the community answered

(47 responses)

A
4% (2)
B
2% (1)
C
2% (1)
D
91% (43)

Explanation

In BGP confederations, the confederation identifier represents the external AS number for the entire confederation. The BGP confederation splits a single large autonomous system (AS) into smaller, manageable sub-ASes. These sub-ASes use private AS numbers internally but appear as a single unified AS to external BGP peers. The confederation identifier ensures that external BGP peers see the confederation as one cohesive AS rather than multiple smaller ASes.

Topics

#BGP Confederation#AS Number#iBGP Scaling

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