Which BGP feature enables data plane fast convergences?
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A. B. C. D. E.B.
The correct answer is D. BGP IP Fast Reroute.
BGP (Border Gateway Protocol) is a routing protocol used to exchange routing information between different networks. It is widely used by Internet Service Providers (ISPs) to interconnect their networks and exchange routing information. BGP is a complex protocol that can take time to converge in case of network failures or changes.
To improve the convergence time of BGP in case of failures, different features have been introduced in the protocol. Among these features, BGP IP Fast Reroute is specifically designed to enable fast data plane convergence.
BGP IP Fast Reroute (IP FRR) is a mechanism that allows BGP to switch the forwarding path of traffic to a pre-computed backup path in case of a link or node failure in the network. IP FRR works by creating a backup next-hop for each prefix in the BGP routing table. The backup next-hop is chosen based on the topology of the network and the available resources.
When a failure occurs in the network, BGP detects the failure and switches the forwarding path of traffic to the backup next-hop. This process is fast and transparent to the end-user, and it can help minimize packet loss and reduce the convergence time of the network.
In summary, BGP IP Fast Reroute is a feature that enables fast data plane convergence in BGP networks. It works by creating backup next-hops for each prefix in the routing table and switching the forwarding path of traffic to the backup next-hop in case of a network failure.