Which BGP feature improves the convergence and response time to adjacency changes with BGP neighbors?
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A. B. C. D. E.C.
http://www.cisco.com/c/en/us/td/docs/ios/12_2sb/feature/guide/sbbnhop.htmlThe correct answer is D. Fast Peering Session Deactivation.
BGP (Border Gateway Protocol) is a routing protocol used to exchange routing information between different networks. One of the challenges with BGP is the time it takes for the network to converge after a change in network topology or a failure. When a BGP neighbor goes down, it can take some time for the BGP session to be torn down, and for the affected routes to be removed from the routing table.
To improve the convergence and response time to adjacency changes with BGP neighbors, Cisco has developed a feature called Fast Peering Session Deactivation. This feature enables BGP to quickly tear down the BGP session with a neighbor that has gone down, and to remove the affected routes from the routing table.
Fast Peering Session Deactivation works by allowing BGP to detect when a BGP neighbor has gone down, and then to quickly tear down the BGP session with that neighbor. When the BGP session is torn down, BGP can immediately remove the affected routes from the routing table, which helps to improve the convergence time.
Reducing BGP scanner timing to the minimum that is supported (answer A) can also improve convergence time, but it can also increase the load on the router's CPU and memory, and may not be appropriate in all cases.
BGP Multihop (answer B) is used when BGP peers are not directly connected and multiple hops are required to reach the neighbor. It does not specifically address the issue of convergence time.
Next-Hop Address Tracking (answer C) is a feature that enables a router to track changes in the next-hop address for a particular route. It can help to improve convergence time, but it does not specifically address the issue of adjacency changes with BGP neighbors.
TTL Security Check (answer E) is a feature that is used to prevent BGP session hijacking by verifying that the TTL (time-to-live) value of the received packets is within a certain range. It does not specifically address the issue of convergence time.