Advantage of BGP Confederation Implementation

C.

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BGP (Border Gateway Protocol) is an inter-domain routing protocol used to exchange routing information between different autonomous systems (ASes) on the internet. BGP Confederation and BGP Route Reflector are two methods used to reduce the amount of IBGP (Internal BGP) peering required in large networks, thus improving scalability and reducing administrative overhead.

BGP Confederation is a method of splitting a large autonomous system into smaller sub-autonomous systems to reduce the number of IBGP peering sessions required. In this method, each sub-autonomous system is assigned a unique identification number, and the sub-autonomous systems are grouped into a confederation. BGP Confederation is advantageous compared to BGP Route Reflector for the following reasons:

D. Confederation is more scalable. In a large network, the full mesh IBGP peering requirement can become unwieldy due to the large number of BGP peers required. Confederation reduces the number of IBGP peering sessions required by dividing the network into smaller sub-autonomous systems.

B. Confederation provides better redundancy. In a Route Reflector implementation, clients can only peer to one cluster, and if the Route Reflector fails, all the clients in that cluster lose connectivity. In a confederation, each sub-autonomous system can have multiple exit points, and if one exit point fails, traffic can be routed through another exit point in the same sub-autonomous system. This provides better redundancy compared to a Route Reflector implementation.

C. The IBGP policies can differ internally within and between sub-autonomous systems. In a Route Reflector implementation, all clients in the same cluster must use the same IBGP policies. In a confederation, each sub-autonomous system can have its own IBGP policies, allowing for greater flexibility in routing policy implementation.

A. Confederation allows use of template session and template policy. Route reflector can use only peer-group. In a confederation, a template session and policy can be defined and applied to all BGP peers within the same sub-autonomous system. This simplifies the configuration process and reduces administrative overhead.

In summary, BGP Confederation is more scalable, provides better redundancy, allows for greater flexibility in routing policy implementation, and simplifies the configuration process compared to BGP Route Reflector.