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Question 34 - JN0-280 discussion

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Which statement is correct about IBGP?

A.

It requires a physical full mesh.

Answers
A.

It requires a physical full mesh.

B.

It requires a logical full mesh.

Answers
B.

It requires a logical full mesh.

C.

It ensures that the local and remote peers use different AS numbers.

Answers
C.

It ensures that the local and remote peers use different AS numbers.

D.

It ensures that duplicate AS numbers are not present in the AS path.

Answers
D.

It ensures that duplicate AS numbers are not present in the AS path.

Suggested answer: B

Explanation:

In IBGP (Internal Border Gateway Protocol), all routers within the same AS (Autonomous System) must have a logical full-mesh topology. This means that every IBGP router must be able to communicate with every other IBGP router directly or indirectly to ensure proper route propagation.

Step-by-Step Breakdown:

Logical Full Mesh:

In an IBGP setup, routers do not re-advertise routes learned from one IBGP peer to another IBGP peer. This rule is in place to prevent routing loops within the AS.

To ensure full route propagation, a logical full mesh is required, meaning every IBGP router must peer with every other IBGP router in the AS. This can be done either directly or via route reflection or confederation.

Physical Full Mesh Not Required:

The physical topology does not need to be a full mesh, but the BGP peering relationships must form a logical full mesh. Techniques like route reflectors or BGP confederations can reduce the need for manual full-mesh peering.

Juniper

Reference:

IBGP Configuration: IBGP logical full mesh requirements can be simplified using route reflectors to avoid the complexity of manually configuring many IBGP peers.

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asked 10/10/2024
Luis Campoy
41 questions
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